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                                  OFFICE LEASE

                                     BETWEEN

                              WGP ASSOCIATES, LLC,
                      A VIRGINIA LIMITED LIABILITY COMPANY
                                  (AS LANDLORD)

                                       AND

            SAVVIS COMMUNICATIONS CORPORATION, A MISSOURI CORPORATION
                                   (AS TENANT)

Section                                                                     Page
1.   PRINCIPAL TERMS                                                          1
2.   GENERAL COVENANTS                                                        2
3.   TERM                                                                     3
4.   RENT                                                                     3
5.   COMPLETION OR REMODELING OF THE PREMISES                                 3
6.   OPERATING EXPENSES                                                       3
7.   SERVICES                                                                 3
8.   QUIET ENJOYMENT                                                          6
9.   DEPOSIT                                                                  6
10.  CHARACTER OF OCCUPANCY                                                   7
11.  MAINTENANCE, ALTERATIONS AND REENTRY BY LANDLORD8
12.  ALTERATIONS AND REPAIRS BY TENANT                                        9
13.  CONSTRUCTION LIENS                                                       9
14.  SUBLETTING AND ASSIGNMENT                                               10
15.  DAMAGE TO PROPERTY                                                      12
16.  INDEMNITY TO LANDLORD                                                   12
17.  SURRENDER AND NOTICE                                                    12
18.  INSURANCE, CASUALTY, AND RESTORATION OF PREMISES                        12
19.  CONDEMNATION                                                            13
20.  DEFAULT BY TENANT                                                       14
21.  DEFAULT BY LANDLORD                                                     16
22.  SUBORDINATION AND ATTORNMENT                                            17
23.  REMOVAL OF TENANT'S PROPERTY                                            18
24.  HOLDING OVER: TENANCY MONTH-TO-MONTH                                    18
25.  PAYMENTS AFTER TERMINATION                                              18
26.  STATEMENT OF PERFORMANCE                                                19
27.  MISCELLANEOUS                                                           19
28.  AUTHORITIES FOR ACTION AND NOTICE                                       21
29.  PARKING                                                                 21
30.  SUBSTITUTE PREMISES                                                     22
31.  BROKERAGE                                                               22
32.  COUNTERPARTS                                                            22
33.  ADDENDUM/EXHIBITS                                                       22


                                       1
<PAGE>




                                 LEASE AGREEMENT

THIS LEASE, dated as of January 24, 2000, is by and between WGP ASSOCIATES, LLC,
a Virginia limited  liability  company  ("Landlord")  and SAVVIS  COMMUNICATIONS
CORPORATION, a Missouri corporation ("Tenant").

                              W I T N E S S E T H :

     1. PRINCIPAL  TERMS.  Capitalized  terms,  first appearing in quotations in
this Section,  elsewhere in the Lease or any Exhibits,  are  definitions of such
terms as used in the  Lease and  Exhibits  and shall  have the  defined  meaning
whenever used.

        1.1     "BUILDING":                  Worldgate Plaza II, 12851 Worldgate
                                             Drive, Herndon, Virginia

        1.2     "PREMISES":                  approximately    80,582    rentable
                                             square  feet  located  on the  5th,
                                             6th,  7th,  and 8th  floors,  which
                                             comprise   the   entirety   of  the
                                             Building

        1.3     "INITIAL TERM":              10 years, 3 months
                                             "Commencement Date": March 1, 2000
                                             "Expiration Date": May 31, 2010



        1.4     "BASE RENT":                                    Annual Per Rentable
                                             Period              Square Foot Rate         Monthly
                                             ------             -------------------       -------
                                                                                 
                                             Months 1-12:               $25.85            $173,587.06 [See
                                                                                           Section 4]
                                             Months 13-24:              $26.68            $179,160.65
                                             Months 25-36:              $27.53            $184,868.54
                                             Months 37-48:              $28.41            $190,777.89
                                             Months 49-60:              $29.32            $196,821.54
                                             Months 61-72:              $31.24            $209,781.81
                                             Months 73-84:              $32.18            $216,094.06
                                             Months 85-96:              $33.15            $222,607.78
                                             Months 97-108:             $34.14            $229,255.79
                                             Months 109-120:            $35.16            $236,105.26
                                             Months 121-122:            $36.21            $243,156.19


          1.5     OPERATING EXPENSES:        Base Year: 2000
                                             Pro Rata Share: 100%

          1.6     DEPOSIT":                  $738,668.32   See Section 9

          1.7     "PERMITTED USE":           Primarily  as general  offices with
                                             ancillary  use for related  uses in
                                             accordance with Section 10

          1.8     "GUARANTOR":               Bridge Information Systems, Inc., a
                                             Missouri corporation

          1.9     PARKING:                   322 spaces in the Parking Garage or
                                             surface parking for the Building in
                                             accordance with Section 29

          1.10    LANDLORD'S NOTICE ADDRESS: WGP  ASSOCIATES,  LLC,  c/o  Miller
                                             Global  Properties,  LLC,  4643  S.
                                             Ulster Street,  Suite 1500, Denver,
                                             CO   80237,    Attn:    Donald   E.
                                             Spiegleman,  Esq. or Mr. Paul Hogan
                                             Facsimile:  303 694-0082 Telephone:
                                             303 773-0369


<PAGE>



                                                          
                       with a copy to Building Manager:      [name, address and phone numbers to be provided by Landlord]
                                                             Facsimile: _____________________
                                                             Telephone: ____________________


          1.11    RENT PAYMENT ADDRESS:      WGP  ASSOCIATES,  LLC,  c/o  Miller
                                             Global  Properties,  LLC,  4643  S.
                                             Ulster Street,  Suite 1500, Denver,
                                             CO 80237

          1.12    LANDLORD'S TAX I.D.:       84-1474051

          1.13    TENANT'S NOTICE ADDRESS:   Steven Gallant, Esq.
                                             Vice President and General Counsel
                                             Savvis Communications Corporation
                                             717 Office Parkway
                                             St. Louis, Mo. 63141
                                             Facsimile: 314 468-7550
                                             Telephone: 314 468 7517

                  with a copy to:            Richard A. Cohn
                                             Bryan Cave LLP
                                             700 Thirteenth Street, N.W.
                                             Washington, DC 20005-3960
                                             Facsimile: 202 508-6200
                                             Telephone: 202 508-6019

          1.14    TENANT'S TAX I.D.:         43-1727675

          1.15    LANDLORD'S BROKER:         Charles  E.   Smith   Real   Estate
                                             Services, L.P.

          1.16    COOPERATING BROKER:        Fred Ezra Company

          1.17    ATTACHMENTS:               [check if applicable]
                                             x       Addendum
                                             x       Work Letter
                                             x       Exhibit A - The Premises
                                             x       Exhibit A-1 - Building  and
                                                     Plaza I
                                             x       Exhibit B - Real Property
                                             x       Exhibit C - Operating
                                                     Expenses
                                                     Exhibit D - [Intentionally
                                                                  Deleted]
                                             x       Exhibit E - Rules and
                                                                 Regulations
                                             x       Exhibit F - Janitorial
                                                                 Specification
                                             x       Exhibit G - HVAC Rates
                                             x       Exhibit H - Parking
                                             x       Exhibit  I   -   Generator,
                                                     Generator Fuel Tank and UPS
                                                     Locations
                                             x       Exhibit J -  Subordination,
                                                     Non-Disturbance         and
                                                     Attornment Agreement

     2. GENERAL  COVENANTS.  Tenant covenants and agrees to pay Rent and perform
the  obligations  hereafter  set forth and in  consideration  therefor  Landlord
leases to Tenant the  Premises as  depicted  on the plat  attached as


                                       2
<PAGE>

EXHIBIT A,  together  with a  non-exclusive  right,  subject  to the  provisions
hereof,  to use  exterior  plazas,  common  areas,  or  other  areas on the real
property  legally  described  on  EXHIBIT  B and all other  common  areas of the
Building and the Building Complex (including, without limitation, parking areas,
sidewalks,  lobby and  corridors),  (the "Real  Property")  and such other areas
designated by Landlord for the exclusive or non-exclusive  use of the tenants of
the Building and Plaza I (as hereinafter defined),  including the Parking Garage
("Common Areas").  The "Building"  includes the building depicted and labeled as
Worldgate Plaza Tower II on the attached EXHIBIT A-1, inclusive of the 5th, 6th,
7th and 8th floors,  the  elevators  and stairs  serving  such  floors,  and the
elevator lobby on the first floor, exclusive of the parking garage portion lying
within the  footprint of the Building  depicted on EXHIBIT A-1. The Building and
the adjacent  building to be  constructed as depicted and labeled on EXHIBIT A-1
as  Worldgate  Plaza Tower I ("Plaza  I"),  Real  Property,  Common  Areas,  and
appurtenances  are  hereinafter  collectively  sometimes  called  the  "Building
Complex." The mechanical rooms  constituting  Common Areas on floors 5,6,7 and 8
of the Building shall be reserved to Landlord's use for Building  operations and
for Tenant's use, not the use of third  parties,  and use of the roof is subject
to the provisions of the Addendum.  The  mechanical  rooms  constituting  Common
Areas  elsewhere  in the  Building  shall be  reserved  for  Landlord's  use for
Building Complex operations  (including permitting the use by Tenant and tenants
of Plaza I, subject to Landlord's control of access and use).

     3. TERM.  The  Initial  Term of the Lease  commences  at 12:01 a.m.  on the
Commencement  Date and terminates at 12:00 midnight on the Expiration  Date (the
Initial Term together with any extensions  thereof is herein  referred to as the
"Term.").

     4. RENT.  Subject to the provisions  below,  commencing on the Commencement
Date and on the first day of each month  thereafter,  Tenant shall pay Base Rent
in the amount  stated in Section 1.4, in advance  without  notice (all  amounts,
including Base Rent, to be paid by Tenant  pursuant to this Lease as the context
requires are sometimes  referred to collectively  as "Rent(s)").  Rents shall be
paid  without set off,  abatement,  or  diminution,  at the address set forth in
Section  1.11  above,  or at such  other  place as  Landlord  from  time to time
designates  in writing.  Notwithstanding  anything to the  contrary set forth in
Section 1.4 above,  Tenant's  obligation to pay Base Rent for the Premises shall
be phased in on a floor by floor basis for the Premises in  accordance  with the
following:  Tenant's obligation to pay Base Rent for the 5th, 7th and 8th floors
(calculated  on the basis of $25.85  annually  per  rentable  square foot) shall
commence  on March 1,  2000;  Tenant's  obligation  to pay Base Rent for the 6th
floor  (calculated  on the basis of $25.85  annually per  rentable  square foot)
shall  commence  on June  1,  2000  and  thereafter  Tenant  shall  pay  Rent in
accordance with Section 1.4.

     5.  COMPLETION  OR  REMODELING  OF  THE  PREMISES.   Provisions   regarding
Landlord's  obligation  to complete the Building and the Premises and  regarding
the  completion  of tenant  finish work in the  Premises are set forth in a work
letter attached to this Lease (the "Work Letter"). "Initial Tenant Finish" means
the Premises in its as-is  condition as modified by all work, if any,  performed
by Landlord at its expense prior to the respective  Delivery Dates in accordance
with the Work  Letter.  Except as provided  in and  subject to the Work  Letter,
Landlord has no  obligation  for the  completion  or remodeling of the Premises.
Tenant will accept the Premises in its "as is" condition on the Delivery Date.

     6. OPERATING EXPENSES.  Tenant shall pay additional Rent in accordance with
EXHIBIT C attached hereto.

     7. SERVICES.

     7.1 Subject to the provisions  below,  Landlord agrees,  without charge, in
accordance  with standards  reasonably  determined by Landlord from time to time
for the Building  consistent  with the standards  observed by operators of first
class  office  buildings in the northern  Virginia  market:  (1) at all hours to
furnish  running  water at those  points of supply for general use of tenants of
the Building;  (2) during Ordinary Business Hours and such other times as may be
required by Tenant to furnish to interior  Common Areas heated or cooled air (as
applicable),   electrical  current,   janitorial   services,   and  maintenance;
(3) during  Ordinary  Business  Hours and such other times as may be required by
Tenant to  furnish  heated or cooled  air to the  Premises  consistent  with the
design  capacity of the Building  HVAC;  (4) to furnish,  subject to capacity of
building systems,  unfiltered treated chilled water for use in Tenant's packaged
HVAC systems


                                       3
<PAGE>

provided  that such  systems are  approved  by  Landlord,  including  strainers,
pumping systems and controls;  (5) to provide,  during Ordinary  Business Hours,
the general use of  passenger  elevators  for ingress and egress to and from the
Premises (at least one such  elevator  shall be available at all times except in
the case of emergencies or repair);  (6) to provide janitorial  services for the
Premises in accordance with the attached EXHIBIT F (including  window washing of
the outside of exterior  windows and  relamping and  replacement  of ballasts in
flourescent  ceiling light fixtures in the Premises);  and (7) to cause electric
current to be supplied to the Premises for Tenant's  Standard  Electrical  Usage
(items (1) through (7) are collectively called  "Services").  "Tenant's Standard
Electrical  Usage"  means  electricity  for  normal  office  purposes  including
fluorescent and incandescent  lighting (including task and task ambient lighting
systems) and for normal office equipment,  including duplicating  (reproduction)
machines and personal  computers  (provided  they do not require any  additional
voltage,  special electrical or HVAC requirements beyond the systems existing in
the Premises),  and internal communications  systems.  "Ordinary Business Hours"
means 8:00 a.m. to 6:00 p.m. Monday through Friday and 8:00 a.m. to 1:00 p.m. on
Saturdays, Legal Holidays excepted. "Legal Holidays" mean New Year's Day, Martin
Luther King Day,  Inauguration Day, Presidents' Day, Memorial Day,  Independence
Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving Day, Christmas Day, and
such  other  national  holidays  hereafter  established  by  the  United  States
Government.  The  security  system  shall be  operative  at all times  except as
required for repair or maintenance and shall restrict access (in accordance with
the security  system  specifications)  to the main Building  lobby and access to
individual floors from the elevator on such days and at such hours as Tenant may
request by notice to Landlord; Tenant shall have access to the Building 24 hours
a day, 7 days a week  (subject to the  provisions  of this Lease).  Any security
system or other security  measures  (collectively  "security") that Landlord may
undertake are for  protection of the physical  structures  only and shall not be
relied upon by Tenant,  its  agents,  employees  or  invitees  to protect  their
person, or property,  including Tenant's Property.  Tenant shall not do anything
to circumvent or allow others to circumvent security.  Tenant shall have a right
to install its own security system in the Building  provided that such system is
installed in such a manner as to permit the  continued  operation of  Landlord's
security  and life safety  systems or is a substitute  security  system (for the
Building and Premises and Tenant's  allocated  portion of parking  level four of
the parking  garage,  as referred to in Section 29, but  excluding  the security
system for the main access controls for the parking garage), reasonably approved
by Landlord, that interfaces with Landlord's life safety systems to permit their
continued  operation.  Tenant shall provide Landlord with keys,  access cards or
access numbers for any security system installed by Tenant to permit Landlord to
have access to the Building and  Premises.  If a substitute  security  system is
used, Tenant shall deliver to Landlord, at the expiration or earlier termination
of the Lease,  all manuals and other  equipment  required  for  operation of the
system and leave in place all  cabling and related  equipment  installed  in the
Building.  Landlord  shall not be liable  for any  failure  of any  security  to
operate or for any  breach or  circumvention  of the  security  by  others,  and
Landlord makes no  representations  or warranties  concerning the  installation,
performance  and  monitoring  of the  security  or that it will  detect or avert
occurrences  which any such security is intended or expected to detect or avert.
Landlord shall maintain the security which it elects to install in good repair.

     7.2  Electricity  for the Building,  including the entirety of the Premises
shall be separately  metered and paid by Tenant upon billing by service provider
of Landlord (based on the actual costs incurred to the provider,  without markup
or profit to Landlord) and electricity shall not be included in amounts required
to be paid by Tenant as Operating Expenses under EXHIBIT C. In addition,  Tenant
shall be  responsible  for and shall pay promptly,  directly to the  appropriate
supplier, all charges for telephone,  interior landscape maintenance,  and other
materials and services furnished directly to Tenant or the Premises,  or used by
Tenant  in or about  the  Premises  during  the  Term,  together  with any taxes
thereon.  Tenant  shall have the right to  contract  for fiber optic cable to be
installed,  at Tenant's  expense,  from the street  right-of-way to the Premises
using  existing  conduits  installed by Landlord for use of this  Building or by
installation of additional conduits,  subject to Landlord's  reasonable approval
based on the  capacity,  design and location of such  conduits.  "Excess  Usage"
means any usage of electricity  (1) during other than Ordinary  Business  Hours;
(2) in an amount in excess of Tenant's  Standard  Electrical  Usage;  or (3) for
Special  Equipment  or for standard  HVAC  services  during other than  Ordinary
Business Hours.  "Special Equipment" means (a) any equipment consuming more than
0.5 kilowatts at rated  capacity,  (b) any  equipment  requiring a voltage other
than  120  volts,  single  phase,  or (c)  equipment  that  requires  the use of
self-contained  HVAC units.  If Tenant desires  Excess Usage,  Landlord will use
reasonable  efforts to supply the same. Tenant shall reimburse  Landlord for all
Landlord's  costs of providing  services for Excess Usage,  including  costs for
materials,   additional  wear  and  tear  on  equipment,  utilities,  and  labor
(including fringe and overhead costs). Computation of such costs will be made by
Landlord's  engineer,  based on his engineering survey of Tenant's Excess Usage.


                                       4
<PAGE>

Tenant shall reimburse  Landlord for all additional  costs, if any,  incurred by
Landlord as a result of Tenant's installation or use of Special Equipment, other
than electrical costs (which shall be included in the metered  electricity),  as
reasonably   determined   by  Landlord's   engineer,   including  all  costs  of
supplementing  the Building HVAC Systems and/or extending or  supplementing  any
electrical  service,  as Landlord  determines is necessary,  as a result of such
Special  Equipment.  "Special  Equipment"  means  (a)  any  equipment  requiring
modification or supplementation of the Building HVAC or electrical systems,  (b)
any  equipment  requiring a voltage other than 120 volts,  single phase,  or (c)
equipment that requires the use of self-contained  HVAC units. If Tenant desires
use of Building  services  after  Ordinary  Business  Hours,  Tenant  shall give
Landlord  such  prior  notice as is  reasonably  required  to  arrange  for such
after-hours services; provided, however, that only 2 hours prior notice shall be
required if such notice is given during  Ordinary  Business  Hours during Monday
through Friday (or such lesser notice as is required so long as after hours HVAC
is under the  control  of the  Charles E. Smith  Environmental  Control  Center,
pursuant to the applicable Building engineering services agreement). Charges for
Building HVAC use after Ordinary  Business  Hours, to be used in determining the
charges referred to above, are set forth on the attached EXHIBIT G. Tenant shall
also reimburse  Landlord for all costs of supplementing the Building HVAC System
and/or extending or supplementing any electrical service, as Landlord determines
is necessary, as a result of Tenant's Excess Usage. Prior to installation or use
of Special  Equipment or  operation  of the  Premises  for extended  hours on an
ongoing basis, Tenant shall notify Landlord of such intended installation or use
and obtain  Landlord's  consent.  Tenant may request  that  Landlord  install at
Tenant's  cost a check meter and/or flow meter to determine the cost of Tenant's
Excess  Usage.  Tenant shall also pay the cost of  replacing  light bulbs and/or
tubes and ballast used in all lighting in the Premises  other than that provided
by Landlord to all tenants of the Building.

     7.3 If Tenant  requires  janitorial  services  other than those included as
standard  Services,  Tenant shall  separately pay for such services monthly upon
billings by Landlord, or Tenant shall, at Landlord's option, separately contract
for such services  with the same company used by Landlord to furnish  janitorial
services to the Building.

     7.4  Landlord  may  discontinue,   reduce,   or  curtail  Services  (either
temporarily or permanently) when necessary due to accident beyond the reasonable
control of Landlord,  repairs, strikes, lockouts,  Applicable Laws, or any other
happening  beyond  Landlord's  reasonable  control.  Landlord  is not liable for
damages to Tenant or any other party as a result of any interruption, reduction,
or  discontinuance  of Services  (either  temporary or permanent)  nor shall the
occurrence  of any such event be  construed  as an eviction of Tenant,  cause or
permit an abatement,  reduction or setoff of Rent, or operate to release  Tenant
from  Tenant's   obligations;   provided,   however,  that  notwithstanding  the
foregoing,  if the  Premises  should  become  unsuitable  for  Tenant's use as a
consequence  of a cessation of Services  (other than an  interruption  resulting
from a fire or other  casualty,  which shall be governed  by the  provisions  of
Section 18) (excluding, however, acts or omissions of Tenant or Tenant's Agents,
as defined below) and persists for more than three (3) consecutive business days
(an  "Interfering  Event"),  then  Tenant  shall  be  entitled  to an  equitable
abatement  of Rent to the extent of the  interference  with  Tenant's use of the
Premises  occasioned  thereby from the date of the  Interfering  Event until the
date the Services are restored to the Premises.  If Tenant  continues to use any
part of the Premises to conduct its  business,  the Rent will only abate for the
untenantable part not used. Should any


                                       5
<PAGE>

malfunction of the Building improvements or facilities required to be maintained
by  Landlord  occur that  affect  such  Services,  Landlord  shall  repair  such
malfunction as soon as reasonably  practicable with reasonable  diligence and in
the event of the  discontinuance,  reduction or  curtailment of Services for any
reason, Landlord shall use commercially reasonable efforts to have such services
restored as soon as reasonably practicable.

     7.5 Tenant shall  promptly  notify  Landlord of any accidents or defects in
the Building of which Tenant has actual  knowledge,  including defects in pipes,
electric  wiring,  and HVAC  equipment,  and of any condition which is likely to
cause injury or damage to the Building or any person or property therein.

     8. QUIET  ENJOYMENT.  So long as an Event of Default has not  occurred  and
which is  continuing,  Tenant is entitled to the quiet  enjoyment  and  peaceful
possession of the Premises  subject to the  provisions  of this Lease.  Landlord
shall under no  circumstances  be held responsible for restriction or disruption
of access to the Building from public  streets  caused by  construction  work or
other actions taken by or on behalf of governmental authorities,  or for actions
taken by other  tenants  (their  employees,  agents,  visitors,  contractors  or
invitees), or any other cause not entirely within Landlord's direct control, and
same shall not constitute a constructive eviction of Tenant nor give rise to any
right or remedy of Tenant against  Landlord of any nature or kind. This covenant
of quiet  enjoyment  is in lieu of any covenant of quite  enjoyment  provided or
implied by law,  and Tenant  expressly  waives any such other  covenant of quiet
enjoyment to the extent broader than the covenant contained in this Section.

     9. DEPOSIT.

     9.1 By not later than 10 days  following  the  delivery  by Landlord of the
fully executed Lease to Tenant,  Tenant shall deposit,  and will keep on deposit
at all times during the Initial Term,  with Landlord the Deposit as security for
the payment and performance of Tenant's obligations under this Lease. If, at any
time,  after an Event of Default by  Tenant,  Landlord  has the right to use the
Deposit,  or so much thereof as necessary,  in payment of Rent, in reimbursement
of any expense  incurred by Landlord,  and in payment of any damages incurred by
Landlord by reason of such Event of  Default.  In such  event,  Tenant  shall on
demand of Landlord  forthwith  remit to Landlord a sufficient  amount in cash to
restore the Deposit to the original  amount.  If the entire Deposit has not been
utilized,  the remaining amount will be refunded to Tenant or to whoever is then
the holder of Tenant's interest in this Lease, without interest,  within 60 days
after  expiration  of the  Initial  Term.  Landlord  may deliver the Deposit (or
rights to the  Deposit  account,  as  referred  to above)  to any  purchaser  of
Landlord's  interest in the  Premises  and  Landlord  shall be  discharged  from
further  liability  therefor  following  actual  delivery  of such  Deposit  and
assumption by the  transferee of Landlord's  obligations  with respect  thereto.
Tenant  agrees  that if a  Mortgagee  succeeds  to  Landlord's  interest  in the
Premises by reason of foreclosure or deed in lieu of foreclosure,  Tenant has no
claim against the Mortgagee for the Deposit or any portion  thereof  unless such
Mortgagee has actually  received the same from  Landlord.  If claims of Landlord
exceed the Deposit, Tenant shall remain liable for the balance.

     9.2  Subject  to the  provisions  of Section  9.4,  if there is no Event of
Default  by  Tenant  as of the end of the end of the 36th  month  following  the
Commencement Date or circumstances which with the mere passage of time or giving
of notice would constitute an Event of Default  following such date, the Deposit
shall be  reduced by  $184,667.08;  if there is Event of Default by Tenant as of
the  end of the  end of the  36th  month  following  the  Commencement  Date  or
circumstances  which  with the mere  passage  of time or giving of notice  would
constitute an Event of Default,  such reduction shall occur thereafter only upon
the  curing of such  Event of  Default  or  circumstances,  as  applicable.  The
remaining  Deposit  shall then be held for the balance of the Initial Term until
the  Expiration  Date (as provided in Section 1.3),  subject to  application  in
accordance with this Section.

     9.3 The  Deposit  shall  be in the  form  of  immediately  available  funds
deposited  in a separate  interest-bearing  account in  Landlord's  name,  which
interest shall be considered  additional Deposit or,  alternatively Tenant shall
have  the  right  to  request  Landlord's  consent  to  the  substitution  of an
irrevocable transferable letter of credit for the Deposit and Landlord shall not
withhold  consent to such  substitution  subject to such letter of credit  being
issued by a lending  institution  approved by Landlord  and the letter of credit
being in a form approved by Landlord ("Letter of


                                       6
<PAGE>

Credit"), such approval not to be unreasonably withheld, conditioned or delayed,
in the amount of the Deposit,  subject to reduction  as provided  above.  If the
Letter of Credit would  otherwise  expire prior to the Expiration  Date,  Tenant
shall  present  Landlord  with an extension or renewal of the initial  Letter of
Credit,  or a  substitute  Letter of Credit in the same form,  not later than 60
days prior to the  expiration  date of such  initial  Letter of  Credit,  from a
lending institution subject to Landlord's  reasonable approval;  such extension,
renewal or substitute  Letter of Credit shall be effective no later than the day
prior to the  expiration of the initial  Letter of Credit and shall  continue in
effect for not less than the period ending with the Expiration Date and shall be
in the  amount  provided  above.  Tenant  agrees  that in an Event of Default by
Tenant (as defined in Section  20),  Landlord  shall have a right to present the
Letter of Credit (or the renewal,  extension or  substitute)  for payment,  with
amounts  received to be held and applied in accordance  with this  Section.  Any
failure of Tenant to provide  Landlord with an extension,  renewal or substitute
Letter of Credit,  as  required  hereunder,  shall be deemed an Event of Default
under the Lease and Landlord  shall have a right to present the Letter of Credit
in accordance with the foregoing provision. If the Letter of Credit has not been
presented  for  payment  in  accordance  with  this  Section  on or  before  the
Expiration  Date,  Landlord  shall return the Letter of Credit to Tenant  within
thirty (30) days after the Expiration  Date.  Tenant agrees that in the event of
any  assignment  or this  Lease or  mortgage,  Landlord  shall have the right to
transfer the Letter of Credit or  substitute  to the assignee or mortgagee  (and
Tenant  shall  pay any  costs or fees  charged  by the  issuer  to  permit  such
transfer),  and if the Letter of Credit has been  transferred as provided above,
Tenant  shall  look  solely to such  transferee  for the return of the Letter of
Credit (or  substitute),  provided  that Landlord  shall give written  notice to
Tenant of transfer of Landlord's interest resulting in transfer of the Letter of
Credit and the  transferee  shall  assume the  obligation  to return the same to
Tenant in accordance  with this Lease.  Landlord shall deliver the  then-current
effective  Letter of Credit to Tenant upon receipt of any conforming  renewal or
substitute  Letter of Credit  provided in  accordance  with this  Paragraph  and
cooperate  with the  issuing  bank to effect the  release  of such  then-current
effective Letter of Credit.

     9.4 In accordance  with  Paragraph 6 of the Addendum,  the  obligations  of
Tenant are  guaranteed by the Guarantor,  Bridge  Information  Systems,  Inc., a
Missouri  corporation,  pursuant  to the  terms of the  Guaranty.  The  Guaranty
provides  for the ability to  substitute  Tenant's  parent  corporation,  Savvis
Communications  Corporation,  a Delaware corporation,  as Guarantor,  subject to
increasing the amount of the Deposit to a total of  $3,196,419.30 in the form of
the Letter of Credit referred to above; the effective date of such  substitution
is referred to as the Substitution Date. In such event, the following  provision
shall be applicable,  in  substitution  for the provisions of Section 9.2 above:
(i) if there  is no  Event of  Default  (or  circumstances  which  with the mere
passage of time or giving of notice  would  constitute  an Event of  Default) by
Tenant  as of the end of the  12th  month  following  the  Substitution  Date or
circumstances  which  with the mere  passage  of time or giving of notice  would
constitute an Event of Default following such date, the Deposit shall be reduced
by  $351,107.29;   (ii)  likewise,   on  each  anniversary   thereafter  of  the
Substitution  Date through and  including  the 7th  anniversary,  if there is no
Event of Default (or circumstances which with the mere passage of time or giving
of notice  would  constitute  an Event of Default) as of such date,  the Deposit
shall be additionally  reduced by $351,107.29  (however,  in no event shall such
reductions  result  in  reduction  below   $738,668.32);   (iii)  if  there  are
circumstances  which  with the mere  passage  of time or giving of notice  would
constitute  an  Event  of  Default  as of  the  respective  anniversary  of  the
Substitution Date, the respective reduction shall occur thereafter only upon the
curing of such  Event of  Default  or  circumstances,  as  applicable;  (iv) the
remaining  Deposit as of the 7th  anniversary of $738,668.32  shall then be held
until the  Expiration  Date of the  Initial  Term,  subject  to  application  in
accordance  with this Section.  The reduction of the amount of the Deposit shall
be effected by amendment of the  then-effective  Letter of Credit (by  amendment
executed by the issuer and Landlord) or by Tenant's substitution of a substitute
Letter of Credit in the respective reduced amount (in which event Landlord shall
surrender the Letter of Credit being held as of the substitution upon receipt of
the substitute).

     10.  CHARACTER  OF  OCCUPANCY.  Tenant  shall  occupy the  Premises for the
Permitted  Use and for no other  purpose,  and use it in a  careful,  safe,  and
proper manner and pay on demand for any damage to the Premises  caused by misuse
or abuse by Tenant,  Tenant's agents or employees,  or any other person entering
upon the Premises under express or implied  invitation of Tenant  (collectively,
"Tenant's Agents").  The term "Permitted Use" shall mean: general office use for
administrative,  clerical, and professional office purposes and the operation of
internet and telecommunications services and Collocation Services (as defined in
Section 14.7)  (collectively,  the "Primary Use") and for  activities  ancillary
thereto (the  "Ancillary  Uses")  provided that  Ancillary Uses shall not be the
primary use of


                                       7
<PAGE>

the Premises, are permitted by Applicable Laws (as hereinafter defined), and are
expressly  approved  by  Landlord,  which  approval  shall  not be  unreasonably
withheld if such uses are consistent  with first class  suburban  general office
building uses and so long as in keeping with Building's  first-class quality and
allowed under PDC zoning applicable to the Building. Tenant shall be responsible
for  obtaining any  approvals or permits  required for the Ancillary  Uses under
Applicable Laws and the Declaration.  Tenant, at Tenant's expense,  shall comply
with  all  applicable  federal,  state,  city,  quasi-governmental  and  utility
provider  laws,  codes,  rules,  and  regulations  now or  hereafter  in  effect
("Applicable  Laws") which impose any duty upon  Landlord or Tenant with respect
to the  occupation or  alteration  of the  Premises.  Tenant shall not commit or
permit waste or any nuisance on or in the Premises.  Tenant agrees not to store,
keep, use, sell,  dispose of or offer for sale in, upon or from the Premises any
article or substance  prohibited by any insurance  policy  covering the Building
Complex nor shall Tenant keep,  store,  produce or dispose of on, in or from the
Premises or the Building Complex any substance which may be deemed an infectious
waste or hazardous  substance under any Applicable Laws, except customary office
and cleaning supplies or supplies customarily associated with the Primary Use of
the  Premises  that  are  disclosed  to  Landlord  and are  stored  and  used in
accordance with Applicable Laws and applicable industry  standards.  Landlord is
responsible  for  complying  with  Applicable  Laws  relating  to  the  Building
(excluding  the  Premises)  and its  Common  Areas,  including  Title III of the
Americans  with  Disabilities  Act of 1990  (the  "ADA")  and the  costs of such
compliance  with existing  Applicable Laws as of the date hereof will be paid by
Landlord  and will not be  charged  back to  Tenant.  The  method  and timing of
compliance  will be within  Landlord's  discretion.  Tenant is  responsible  for
compliance with all existing and any new Applicable Laws,  including ADA, within
the Premises.  Landlord will include  Landlord's  future compliance costs due to
changes in or new  Applicable  Laws as an Operating  Expense in accordance  with
Exhibit  C. To the  extent  that  Tenant  is  responsible  for  compliance  with
Applicable  Laws,  Tenant  shall  have  the  right  to  contest  by  appropriate
proceedings  diligently  conducted in good faith, in the name of Tenant or, with
the prior written  consent of Landlord,  in the name of Landlord,  or both,  the
validity or application of any Applicable Laws of any nature affecting Tenant or
its use of the Premises.  If compliance with any of such Applicable Laws legally
may be delayed pending the prosecution of any proceeding,  without incurring any
lien,  charge or liability of any kind against the Building and/or the Premises,
or against  Landlord's  interest in the Building  and/or the Premises or sale of
the Building and/or the Premises,  and without  subjecting Tenant or Landlord to
any  liability,  civil or  criminal,  interest or penalty for failure to comply,
Tenant may delay compliance until the final determination of the proceeding.

     11. MAINTENANCE, ALTERATIONS AND REENTRY BY LANDLORD.

     11.1 Landlord will (i) make repairs and  replacements to HVAC,  mechanical,
life safety and  electrical  systems in the Premises (to the extent such systems
are Building standard) deemed necessary by Landlord for normal operations of the
Building  Complex;  and (ii)  provide  upkeep,  maintenance,  and repairs to all
Common Areas of the Building Complex,  including without  limitation the Parking
Facilities,  and all  structural  elements of the  Building,  including  without
limitation the roof,  exterior  walls  (including  windows and glass),  interior
bearing walls, foundations, footings, and all exterior surfaces of the Building.
Landlord  shall  perform its  obligations  under this  Section  11.1 in a manner
consistent with other first class office buildings in the northern Virginia area
and in accordance  with Applicable  Laws.  Except as provided in this Section or
otherwise  expressly  required in this Lease,  Landlord is not  required to make
improvements or repairs to the Premises during the Term.

     11.2  Landlord  or  Landlord's  agents may at any time  enter the  Premises
without notice in case of emergency and for  performance of janitorial  services
and in all other  instances  after  reasonable  prior oral or written  notice to
Tenant and subject to compliance  with  Tenant's  reasonable  security  measures
(which may include an escort) for examination and inspection,  or to perform, if
Landlord elects, any obligations of Tenant which Tenant fails to perform or such
cleaning, maintenance, janitorial services, repairs, replacements, additions, or
alterations  as  Landlord  deems  necessary  for  the  safety,  improvement,  or
preservation  of the Premises or other  portions of the  Building  Complex or as
required by Applicable  Laws.  Landlord or  Landlord's  agents may also show the
Premises to prospective purchasers,  Mortgagees and during the last 12 months of
the Term, to prospective tenants,  upon not less than 48 hours prior notice. Any
such reentry does not  constitute an eviction or entitle  Tenant to abatement of
Rent.  Landlord may make such  alterations  or changes in other  portions of the
Building Complex as Landlord desires so long as such alterations and


                                       8
<PAGE>

changes do not unreasonably interfere with Tenant's occupancy of the Premises or
use of the Common  Areas or conflict  with the other  provisions  of this Lease.
Landlord  may use the  Common  Areas  and one or more  street  entrances  to the
Building  Complex as may be necessary in  Landlord's  judgment to complete  such
work.

     12. ALTERATIONS AND REPAIRS BY TENANT.

     12.1 Tenant shall not make any alterations to the Premises during the Term,
including installation of equipment or machinery which requires modifications to
existing  electrical  outlets or increases  Tenant's usage of electricity beyond
Tenant's Standard Electrical Usage (collectively  "Alterations") without in each
instance first  obtaining the written  consent of Landlord,  which consent shall
not be  unreasonable  withheld,  conditioned or delayed.  Landlord's  consent or
approval of the plans,  specifications  and working drawings for any Alterations
shall not constitute any warranty or  representation  by Landlord (and shall not
impose any liability on Landlord) as to their completeness,  design sufficiency,
or compliance with  Applicable  Laws;  provided,  however,  Tenant may,  without
Landlord's consent,  perform interior  non-structural  Alterations not involving
modifications  to the Base  Building  plumbing,  electrical,  mechanical or life
safety  systems (as  distinguished  from the  portions of such  systems  located
within the  Premises  that are  installed  by Tenant as Initial  Tenant  Finish)
provided the cost of any particular  Alterations  (taking into account  together
all  Alterations  being made as part of a common or phased plan) does not exceed
Seventy Five Thousand Dollars  ($75,000)(such  cost limit shall not, however, be
applicable to Alterations  on the 6th floor).  Tenant shall at its cost: pay all
engineering and design costs incurred by Landlord as to all Alterations,  obtain
all governmental permits and approvals required, and cause all Alterations to be
completed in compliance  with  Applicable  Laws and  requirements  of Landlord's
insurance.  All such work relating to  Alterations  shall be performed in a good
and  workmanlike  manner,  using new  materials  and equipment at least equal in
quality to the Initial Tenant Finish.  All  Alterations,  repair and maintenance
work  performed  by  Tenant  shall be done at  Tenant's  expense  by  Landlord's
employees or, with  Landlord's  prior consent,  which shall not be  unreasonably
withheld, conditioned or delayed, by other persons requested by Tenant; however,
if such work is not performed by Landlord's employees, Tenant shall pay Landlord
a  supervisory  fee upon  receipt of an  invoice.  If Landlord  authorizes  such
persons to perform work,  Tenant shall deliver to Landlord prior to commencement
certificates issued by insurance companies qualified to do business in the state
in which the Premises are located, evidencing that worker's compensation, public
liability insurance,  and property damage insurance (in amounts,  with companies
and on forms  satisfactory  to  Landlord)  are in force  and  maintained  by all
contractors  and  subcontractors  engaged to perform  such work.  All  liability
policies  shall name  Landlord,  Building  Manager,  and Mortgagee as additional
insureds.  Each certificate shall provide that the insurance may not be canceled
or modified  without 10 days' prior  written  notice to Landlord and  Mortgagee.
Landlord  also has the  right  to post  notices  in the  Premises  in  locations
designated by Landlord  stating that Landlord is not responsible for payment for
such work and containing such other information as Landlord deems necessary. All
such work shall be performed in a manner which does not  unreasonably  interfere
with the performance of Landlord's  rights and obligations  under this Lease, or
impose  additional  expense  upon  Landlord  in the  operation  of the  Building
Complex.

     12.2 Tenant shall keep the Premises in as good order, condition, and repair
and in an orderly  state,  as on the  Commencement  Date,  loss by fire or other
casualty or ordinary wear excepted.

     12.3 All Alterations,  including partitions, paneling, carpeting, drapes or
other window  coverings,  and light  fixtures (but not including  movable office
furniture,  equipment  and  other  property  not  permanently  attached  to  the
Building), are deemed a part of the real estate and the property of Landlord and
remain upon and be surrendered with the Premises at the end of the Term, whether
by lapse of time or otherwise,  unless Landlord notifies Tenant no later than 15
days  prior to the end of the Term that it elects to have  Tenant  remove all or
part of such  Alterations,  and in such event,  Tenant shall at Tenant's expense
promptly remove the Alterations  specified and restore the Premises to its prior
condition, reasonable wear and tear excepted.

         13.  CONSTRUCTION  LIENS.  Tenant  shall  pay for all work  done on the
Premises by Tenant or at its request (other than the Initial Tenant Finish) of a
character  which may result in liens on  Landlord's  or  Tenant's  interest  and


                                       9
<PAGE>

Tenant will keep the Premises free of all construction liens, and other liens on
account of such work. Tenant  indemnifies,  defends,  and saves Landlord and all
Mortgagees  harmless from all liability,  loss,  damage, or expenses,  including
attorneys' fees, on account of any claims of laborers, materialmen or others for
work  performed  or for  materials  or supplies  furnished  to Tenant or persons
claiming under Tenant.  If any lien is recorded against the Premises or Building
or any suit  affecting  title  thereto is commenced as a result of such work, or
supplying  of  materials,  Tenant  shall cause such lien to be removed of record
within 10 days after  notice  from  Landlord.  If Tenant  desires to contest any
claim, Tenant must either arrange for release of such lien and substitution of a
bond or other  collateral  (in  accordance  with  Applicable  Laws)  or  furnish
Landlord  adequate  security  of at least 150% of the amount of the claim,  plus
estimated costs and interest and, if a final judgment  establishing the validity
of any lien is entered,  Tenant shall  immediately  pay and satisfy the same. If
Tenant  fails to  proceed as  aforesaid,  Landlord  may pay such  amount and any
costs, and the amount paid,  together with reasonable  attorneys' fees incurred,
shall be immediately due Landlord upon notice.

     14. SUBLETTING AND ASSIGNMENT.

     14.1 Except as provided in Section  14.7,  Tenant shall not sublet any part
of the  Premises  nor assign or  otherwise  transfer  this Lease or any interest
herein  (sometimes  referred to as "Transfer," and the subtenant or assignee may
be referred  to as  "Transferee")  without  the consent of Landlord  first being
obtained,  which  consent  will not be  unreasonably  withheld,  conditioned  or
delayed  provided that: (1) Tenant complies with the provisions of Section 14.4;
(2)  Landlord  declines to  exercise  its rights  under  Section  14.3;  (3) the
Transferee is engaged in a business and the portion of the Premises will be used
for the Permitted Use in a manner which is in keeping with the then standards of
the Building and does not conflict with any exclusive use rights  granted to any
other  tenant  of the  Building  Complex;  (4)  the  Transferee  has  reasonable
financial worth in light of the responsibilities  involved; (5) Tenant is not in
default  at  the  time  it  makes  its  request;  (6)  the  Transferee  is not a
governmental  or  quasi-governmental  agency;  and (7) the  Transferee  is not a
tenant or currently  negotiating a lease with Landlord in any building  owned by
Landlord  in the  metropolitan  area  of the  Building  Complex  (including  the
Building  Complex).  Transfer  includes a sale by Tenant of substantially all of
its  assets or stock if Tenant is a  publicly  traded  corporation,  a merger of
Tenant with another  corporation,  the transfer of 49% or more of the stock in a
corporate tenant whose stock is not publicly traded,  or transfer of 49% or more
of the  beneficial  ownership  interests in a partnership  or limited  liability
company  tenant.  If any  Alterations  to the  Premises or the Common  Areas are
required by Applicable  Laws in connection  with such Transfer or the particular
business  of such  Transferee,  such  Alterations  shall be subject to the prior
approval of Landlord  (which  approval shall not be  unreasonably  withheld) and
Tenant shall bear the cost of such Alterations.

     14.2  Following any Transfer in accordance  with this Section 14,  Landlord
may, during the continuance of an Event of Default by Tenant,  collect rent from
the  Transferee or occupant and apply the net amount  collected to the Rent, but
no Transfer or  collection  will be deemed an  acceptance  of the  Transferee or
occupant as Tenant or release Tenant from its obligations. Consent to a Transfer
shall  not  relieve  Tenant  from  obtaining  Landlord's  consent  to any  other
Transfer.  Notwithstanding  Landlord's  consent  to  a  Transfer,  Tenant  shall
continue to be primarily liable for its obligations. If Tenant collects any rent
or other amounts from a Transferee in excess of the Rent (after deduction of the
reasonable  costs of such  Transfer)  for any monthly  period,  Tenant shall pay
Landlord fifty percent (50%) of the excess monthly, as and when received.

     14.3  Notwithstanding  the above (and except for a Transfer permitted under
Section 14.7),  if Tenant requests  Landlord's  consent to sublet 49% or more of
the Premises for all or  substantially  all of the remainder of the then-current
Term of the Lease or assign Tenant's interest in the Lease,  Landlord may refuse
to grant such consent in its sole  discretion and terminate this Lease as to the
portion  of the  Premises  with  respect to which such  consent  was  requested;
provided,  however,  if Landlord  does not consent and elects to  terminate  the
Lease as to such  portion,  Tenant may within 15 days after notice from Landlord
to this effect  withdraw  Tenant's  request  for  consent.  If such  termination
occurs,  it shall be effective on the date  designated in a notice from Landlord
and shall not be more than 30 days following such notice.


                                       10
<PAGE>

     14.4 Tenant must notify Landlord at least 30 days prior to the desired date
of the  Transfer  ("Tenant's  Notice"),  excluding  a Transfer  permitted  under
Section 14.7.  Tenant's  Notice shall describe the portion of the Premises to be
transferred and the terms and conditions.  Landlord has, without obligation,  15
days  following  receipt of Tenant's  Notice to (i) propose a subtenant for such
space (which  subtenant  shall be subject to  reasonable  approval of Tenant) or
(ii) exercise its rights pursuant to Section 14.3 if Tenant's  Notice  discloses
that 49% or more of the Premises is involved; provided, however, that Landlord's
option in  clause  (i) shall not be  applicable  until 24 months  following  the
Commencement  Date so long as the  Transfers  are  subleases for a period not to
exceed 36 months which which do not involve more than 33% of the Premises in the
aggregate.  If the space covered by Tenant's  Notice is subleased to a sublessee
proposed by Landlord, rent and other sums due from the subtenant will be paid to
Tenant directly and Landlord has no  responsibility  for the performance by such
subtenant of its  obligations  under its sublease with Tenant.  If Landlord does
not  exercise  its rights  under  clause (i) or clause (ii) within 15 days after
receipt of Tenant's  Notice,  Landlord shall be deemed to have waived its rights
under those clauses with respect to the proposed transaction and Tenant shall be
free to sublet the specified portion of the Premises to any third party on terms
substantially  identical  to those  described  in  Tenant's  Notice,  subject to
Landlord's consent as set forth above. If Tenant does not sublet such portion of
the Premises within 180 days following Landlord's notice to Tenant,  Tenant must
reoffer the Premises to Landlord in accordance with the provisions  hereof prior
to subleasing to a third party.

     14.5 All documents utilized by Tenant to evidence a Transfer are subject to
approval by Landlord. Tenant shall pay Landlord's reasonable expenses, including
reasonable  attorneys' fees, of determining  whether to consent and in reviewing
and approving the documents. Tenant shall provide Landlord with such information
as  Landlord  reasonably  requests  regarding a proposed  Transferee,  including
financial information.

     14.6 If a trustee or debtor in  possession  in  bankruptcy  is  entitled to
assume control over Tenant's  rights under this Lease and assigns such rights to
any third party  notwithstanding  the provisions  hereof, the rent to be paid by
such party shall be  increased  to the current  Base Rent (if greater  than that
being paid for the Premises) which Landlord  charges for comparable space in the
Building as of the date of such third party's occupancy. If Landlord is entitled
under the Bankruptcy Code to "Adequate  Assurance" of future performance of this
Lease, the parties agree that such term includes the following:

     (1) Any assignee must demonstrate to Landlord's  reasonable  satisfaction a
net  worth  (as  defined  in  accordance  with  generally  accepted   accounting
principles consistently applied) at least as large as the net worth of Tenant on
the  Commencement  Date  [increased by 4%,  annually,  for each year  thereafter
through  the date of the  proposed  assignment]  or other  equivalent  financial
capacity.  Tenant's financial condition was a material inducement to Landlord in
executing this Lease.

     (2) The  assignee  must assume and agree to be bound by the  provisions  of
this Lease.

     14.7  Notwithstanding  anything to the contrary  contained  hereinabove but
subject to Section 14.2 and provided that the  conditions of clauses (3) and (5)
of Section 14.1 are met, Tenant may, without obtaining  Landlord's prior written
consent,  assign or sublease all or any portion of the Premises to the following
parties on the following  conditions:  (1) any  subsidiary or affiliate in which
Tenant has, directly or indirectly, an ownership interest of more than 50%; (ii)
any direct or ultimate  parent of Tenant;  (iii) any  subsidiary or affiliate in
which Tenant's  parent owns,  directly or  indirectly,  by means of an ownership
interest  of more than 50%;  or (iv) any  corporation  into which  Tenant may be
merged or consolidated or which purchases all or substantially all of the assets
or stock of Tenant  provided that the resulting  corporation  has a net worth at
least equal to Tenant's net worth as of the date  hereof.  A sale or transfer of
stock in Tenant pursuant to a public offering,  including  publicly traded stock
or  Tenant,  shall be  permitted  without  obtaining  Landlord's  prior  written
consent.  As soon as  practicable  prior to the effective  date of a transaction
permitted   under  this  Section  14.7,   Tenant  will  provide   Landlord  with
documentation  evidencing  such  transaction and such other evidence as Landlord
may reasonably require to establish that such transaction falls within the terms
and  provisions  of this  Section.  Furthermore,  Tenant may allow  employees of
companies  to whom  Tenant is  providing  products or  services  (including  the
maintenance


                                       11
<PAGE>

and  operation of computer  servers for such  companies) or with which Tenant is
collaborating   in  the   development  or  provision  of  products  or  services
(collectively  referred to as  "Collocation  Services")  to work in the Premises
without  Landlord's  consent and without being deemed to have sublet any portion
of the  Premises,  so  long as such  employees  do not  occupy  space  which  is
separated  from that occupied by Tenant by demising walls and the number of such
employees  whose primary place of employment is the Premises does not exceed ten
percent (10%) of the total number of persons regularly occupying the Premises.

     15. DAMAGE TO PROPERTY. Tenant agrees Landlord is not liable for any injury
or damage,  either  proximate  or remote,  occurring  through or caused by fire,
water, steam, or any repairs, alterations,  injury, accident, or any other cause
to the Premises,  to any  furniture,  fixtures,  Tenant  improvements,  or other
personal property of Tenant kept or stored in the Premises, or in other parts of
the  Building  Complex,  whether  by  reason of the  negligence  or  default  of
Landlord,  other occupants,  any other person, or otherwise;  and the keeping or
storing of all property of Tenant in the Premises and Building Complex is at the
sole risk of Tenant.

     16. INDEMNITY TO LANDLORD.

     16.1 Tenant  agrees to  indemnify,  defend,  and hold Landlord and Building
Manager harmless from all liability,  costs, or expenses,  including  attorneys'
fees,  on  account  of damage  to the  person or  property  of any third  party,
including any other tenant in the Building Complex,  to the extent caused by the
negligence or breach of this Lease by the Tenant or Tenant's Agents.

     16.2  Tenant  shall  maintain  throughout  the  Term a  commercial  general
liability  policy,  including  protection  against  death,  personal  injury and
property damage,  issued by an insurance company qualified to do business in the
state in which the Premises  are  located,  with a single limit of not less than
$1,000,000.00.  Such policy shall name Landlord, Building Manager, and Mortgagee
as  additional  insureds,  be primary  to any other  similar  insurance  of such
additional  insureds,  and  provide  that it may not be  cancelled  or  modified
without at least 20 days' prior  notice to Landlord and  Mortgagee.  The minimum
limits of such insurance do not limit the liability of Tenant  hereunder.  Prior
to  occupancy  of the  Premises,  and prior to  expiration  of the  then-current
policy,  Tenant shall deliver  certificates  evidencing that insurance  required
under this Lease is in effect.

     16.3 Landlord  agrees to indemnify,  defend,  and hold Tenant harmless from
all liability,  costs,  or expenses,  including  attorneys'  fees, on account of
damage to the person or property of any third party (excluding  Tenant's Agents)
including any other tenant in the Building Complex,  to the extent caused by the
negligence  or breach of this Lease by Landlord,  subject to the  provisions  of
Section 18.6

     17. SURRENDER AND NOTICE.  Upon the expiration or other termination of this
Lease,  Tenant  shall  immediately  quit and  surrender to Landlord the Premises
broom clean,  in good order and  condition,  ordinary  wear and tear and loss by
fire or other  casualty  excepted,  and Tenant  shall  remove all of its movable
furniture and other effects,  all telephone  cable and related  equipment in the
Building  installed for Tenant, and such Alterations,  as Landlord requires.  If
Tenant fails to timely vacate the Premises as required, Tenant is responsible to
Landlord for all resulting costs and damages of Landlord,  including any amounts
paid to third parties who are delayed in occupying the Premises.

     18. INSURANCE, CASUALTY, AND RESTORATION OF PREMISES.

     18.1 Landlord shall maintain  property  insurance for the Building Complex,
the shell and core of the Building and the Premises in such  amounts,  from such
companies, and on such terms and conditions, sufficient to prevent Landlord from
being a coinsurer under its policy of insurance,  for property loss equal to the
full replacement value of the Building Complex and public liability insurance in
an amount customary for first class office  properties in the Northern  Virginia
area.


                                       12
<PAGE>

     18.2 Tenant shall maintain  throughout the Term insurance coverage at least
as broad as ISO Special Form Coverage  against risks of direct  physical loss or
damage  (commonly known as "all risk") for the full replacement cost of Tenant's
property and betterments in the Premises,  including  tenant finish in excess of
the Initial Tenant Finish.

     18.3 If the Building is damaged by fire or other casualty which renders the
Premises  wholly  untenantable  and the damage is so extensive that an architect
selected by Landlord  certifies in writing to Landlord and Tenant within 30 days
of said  casualty (or such longer  period,  not to exceed a total of 45 days, if
Landlord  is unable to obtain  such  certification  within the 30 day period for
causes beyond Landlord's  reasonable control) that the Premises cannot, with the
exercise of reasonable  diligence,  be made fit for occupancy within 180 working
days from the  happening  thereof,  then,  at the option of  Landlord  or Tenant
exercised  in writing to the other  within 30 days of such  determination,  this
Lease shall  terminate  as of the  occurrence  of such  damage.  In the event of
termination,  Tenant  shall  pay Rent  duly  apportioned  up to the time of such
casualty and forthwith surrender the Premises and all interest.  If Tenant fails
to do so,  Landlord may reenter and take  possession  of the Premises and remove
Tenant.  If, however,  the damage is such that the architect  certifies that the
Premises can be made tenantable  within such 180-day period or neither  Landlord
or Tenant elects to terminate  the Lease despite the extent of damage,  then the
provisions below apply.

     18.4 If the  Premises are damaged by fire or other  casualty  that does not
render it wholly untenantable and require a repair period in excess of 180 days,
Landlord shall with reasonable  promptness  except as hereafter  provided repair
the Premises up to the level of the Initial Tenant Finish.

     18.5 If the Parking Garage or portions of the Building Complex required for
support or operation of the Building is damaged  (though the Premises may not be
affected, or if affected, can be repaired within 180 days) and within 30 days of
said  casualty  (or such  longer  period,  not to exceed a total of 45 days,  if
Landlord  is unable to obtain  such  certification  within the 30 day period for
causes beyond Landlord's reasonable control) Landlord decides not to reconstruct
or rebuild the Building,  then,  notwithstanding anything contained herein, upon
notice to that effect from  Landlord  within said  period,  Tenant shall pay the
Rent apportioned to the later of such casualty or the date that Tenant ceases to
use the Premises,  this Lease shall terminate from the date of such notice,  and
both parties discharged from further  obligations except as otherwise  expressly
provided.

     18.6 Landlord and Tenant waive all rights of recovery against the other and
its  respective  officers,  partners,  members,  agents,  representatives,   and
employees  for loss or  damage  to its real and  personal  property  kept in the
Building  Complex  which is capable of being  insured  against under ISO Special
Form Coverage,  or for loss of business  revenue or extra expense arising out of
or related to the use and occupancy of the Premises. Tenant also waives all such
rights of recovery  against  Building  Manager and Building  Manager  waives all
rights to recovery against Tenant. Each party shall, upon obtaining the property
damage insurance  required by this Lease,  notify the insurance carrier that the
foregoing waiver is contained in this Lease and use reasonable efforts to obtain
an appropriate waiver of subrogation provision in the policies.

     18.7 Rent shall  abate from the later of the date of such  casualty  or the
date that Tenant  ceases to use the Premises and  continuing  until  substantial
completion  during any period of repair and  restoration  up to the level of the
Initial Tenant Finish permitting  occupancy by Tenant,  any recovery by Landlord
under its loss of rent insurance  related to the Premises in the same proportion
that  the  part  of the  Premises  rendered  untenantable  bears  to the  whole;
provided,  however,  if the casualty is the fault of Tenant or Tenant's  agents,
then the Rent will abate  during any such period of repair and  restoration  but
only to the  extent of any  recovery  by  Landlord  under its  rental  insurance
related to the Premises.

     19. CONDEMNATION. If the Premises or substantially all of it or any portion
of the Building  Complex  which  renders the Premises  untenantable  is taken by
right of eminent domain, or by condemnation (which includes a conveyance in lieu
of a taking),  this Lease, at the option of either Landlord or Tenant  exercised
by notice to the other within 30 days after the taking, shall terminate and Rent
shall  be  apportioned  as of the date of the  taking.  Tenant  shall  forthwith
surrender  the Premises and all interest in this Lease,  and, if Tenant fails to
do so, Landlord may reenter and take


                                       13
<PAGE>

possession  of the  Premises.  If less than all the Premises is taken,  Landlord
shall  promptly  repair the  Premises  as nearly as  possible  to its  condition
immediately  prior to the taking,  unless  Landlord  elects not to rebuild under
Section 18.5.  Landlord shall receive the entire award or consideration  for the
taking,  except with respect to the value of Tenant's  improvements and fixtures
and for any separate award made to Tenant for its relocation  expenses  pursuant
to a  separate  independent  action  taken  by  Tenant  against  the  condemning
authority.

     20. DEFAULT BY TENANT.

     20.1 Each of the following events is an "Event of Default":

     (1) Any failure by Tenant to pay Rent on the due date  unless such  failure
is cured within 5 business days after notice by Landlord; however, Tenant is not
entitled to more than 2 notices of delinquent  payments during any calendar year
and, if  thereafter  during such calendar year any Rent is not paid when due, an
Event of Default shall automatically occur;

     (2) Tenant  vacates  (other than  temporary  vacation  during  which period
Tenant is engaged in trying to relet the  Premises) or abandons the Premises (as
evidenced by vacating the Premises  with the intent by Tenant not to be bound by
the terms of the Lease, as evidenced by a breach of any of its other obligations
under the Lease, including the payment of Rent);

     (3) This Lease or Tenant's interest is transferred  whether  voluntarily or
by operation of law except as permitted in Section 14;

     (4) This  Lease  or any part of the  Premises  is taken by  process  of law
against Tenant and is not released within 15 days after a levy;

     (5)  Commencement by Tenant of a proceeding  under any provision of federal
or state law relating to insolvency,  bankruptcy, or reorganization ("Bankruptcy
Proceeding");

     (6)  Commencement  of  a  Bankruptcy   Proceeding  against  Tenant,  unless
dismissed within 60 days after commencement;

     (7) The  insolvency of Tenant or execution by Tenant of an  assignment  for
the benefit of creditors; or the failure of Tenant generally to pay its debts as
they  mature,  or the  occurrence  of any of the  foregoing  with respect to any
Guarantor, if any, of Tenant's obligations;

     (8) The admission in writing by Tenant (or any general partner of Tenant if
Tenant is a  partnership),  that it is unable to pay its debts as they mature or
it is generally not paying its debts as they mature;

     (9)  Tenant  fails  to take  possession  of the  Premises  by the  90th day
following the Commencement Date (which deadline may be extended by delays beyond
the reasonable  control of Tenant,  provided that Tenant is proceeding  with due
diligence to complete the Finish Work and move into the Premises);

     (10)   Tenant   fails  to  perform  any  of  its  other   obligations   and
non-performance  continues  for 30 days  after  notice by  Landlord  or, if such
performance cannot be reasonably had within such 30 day period,  Tenant does not
in good faith  commence  performance  within  such 30 day period and  diligently
proceed  to  completion;  provided,  however,  that if  Tenant's  failure  would
constitute a violation of Applicable  Law and Landlord would be subject to fines
or penalties or use of the Building Complex by another tenant would be adversely
affected,  Tenant's  right to cure  shall not  exceed  the  period  provided  by
Applicable Law;


                                       14
<PAGE>

     (11) Any event which is expressly  defined as or deemed an Event of Default
under Sections 9 and 27.22 of this Lease.

     20.2 Remedies of Landlord. If an Event of Default occurs, Landlord may then
or at any time thereafter, either:

     (1) (a) Without  further  notice  except as required  by  Applicable  Laws,
reenter  and  repossess  the  Premises  or any part and expel  Tenant  and those
claiming  through or under Tenant and remove the effects of both  without  being
deemed  guilty of any manner of trespass  and without  prejudice to any remedies
for arrears of Rent or preceding  breach of this Lease.  Should Landlord reenter
or take possession  pursuant to legal  proceedings or any notice provided for by
Applicable Law, Landlord may, from time to time, without terminating this Lease,
relet the  Premises  or any part,  either  alone or in  conjunction  with  other
portions of the Building  Complex,  in  Landlord's  or Tenant's name but for the
account  of  Tenant,  for such  periods  (which  may be greater or less than the
period which would  otherwise have  constituted  the balance of the Term) and on
such conditions and upon such other terms (which may include concessions of free
rent and alteration  and repair of the Premises) as Landlord,  in its reasonable
discretion,  determines and Landlord may collect the rents therefor. Landlord is
not in any way  responsible or liable for failure to relet the Premises,  or any
part  thereof,  or for any failure to collect any rent due upon such  reletting,
but Landlord shall use commercially  reasonable efforts to mitigate its damages.
If there is other  unleased  space in the Worldgate  complex  (consisting of the
Building,  Plaza I and  building  that  may be built  on the  property  known as
Worldgate Parcel 12; collectively,  the "Worldgate Complex"), Landlord may lease
such other space  without  prejudice to its  remedies  against  Tenant.  No such
reentry  or  repossession  or notice  from  Landlord  shall be  construed  as an
election by Landlord to  terminate  this Lease  unless  specific  notice of such
intention is given Tenant.  Acts of  maintenance or  preservation  or efforts to
relet the Premises or the  appointment of a receiver upon initiative of Landlord
to  protect  Landlord's  interest  under  this  Lease  shall  not  constitute  a
termination of Tenant's  contractual  liability  under this Lease unless written
release of liability is given by Landlord to Tenant. Landlord reserves the right
following any reentry  and/or  reletting to exercise its right to terminate this
Lease by giving  Tenant  notice,  in which  event this Lease will  terminate  as
specified in the notice.

     (b) If Landlord takes possession of the Premises  without  terminating this
Lease,  Tenant  shall  pay  Landlord  (i) the Rent  which  would be  payable  if
repossession  had not  occurred,  less  (ii) the net  proceeds,  if any,  of any
reletting of the Premises after deducting all of Landlord's expenses incurred in
connection with such  reletting,  including all reasonable  repossession  costs,
brokerage commissions,  attorneys' fees, expenses of employees,  alteration, and
repair costs  (collectively  "Reletting  Expenses").  If, in connection with any
reletting,  the new lease term extends  beyond the Term or the premises  covered
thereby include other premises not part of the Premises, a fair apportionment of
the rent received from such reletting and the Reletting  Expenses,  will be made
in determining the net proceeds received from the reletting. In determining such
net proceeds, rent concessions will also be apportioned over the term of the new
lease.  Tenant shall pay such  amounts to Landlord  monthly on the days on which
the Rent  would  have been  payable  if  possession  had not been  retaken,  and
Landlord is entitled to receive the same from Tenant on each such day; or

     (2) Give Tenant notice of  termination  of this Lease on the date specified
and, on such date,  Tenant's right to possession of the Premises shall cease and
the Lease will terminate except as to Tenant's  liability as hereafter  provided
as if the  expiration of the term fixed in such notice were the end of the Term.
If this Lease  terminates  pursuant to this Section,  Tenant  remains  liable to
Landlord  for damages in an amount equal to the Rent which would have been owing
by Tenant for the  balance of the Term had this Lease not  terminated,  less the
net  proceeds,  if any, of reletting of the Premises by Landlord  subsequent  to
termination  after  deducting  Reletting  Expenses.  Landlord  may collect  such
damages  from  Tenant  monthly  on the days on which  the Rent  would  have been
payable if this Lease had not  terminated  and  Landlord  shall be  entitled  to
receive the same from Tenant on each such day.  Alternatively,  if this Lease is
terminated,  Landlord  at its option may  recover  forthwith  against  Tenant as
damages  for loss of the  bargain  and not as a penalty  an amount  equal to the
worth at the time of termination of the excess,  if any, of the Rent reserved in
this Lease for the balance of the Term over the then Reasonable  Rental Value of
the Premises for the same period plus all Reletting Expenses. "Reasonable Rental
Value" is the amount of rent  Landlord can obtain for the  remaining  balance of
the Term.


                                       15
<PAGE>

     20.3 Cumulative Remedies.  Suits to recover Rent and damages may be brought
by Landlord,  from time to time, and nothing herein  requires  Landlord to await
the  date  the  Term  would  expire  had  there  been no  Event  of  Default  or
termination,  as the case may be.  Each  right and remedy  provided  for in this
Lease is cumulative  and  non-exclusive  and in addition to every other right or
remedy  now or  hereafter  existing  at  law  or  equity,  including  suits  for
injunctive  relief and  specific  performance.  The exercise or beginning of the
exercise by Landlord of one or more rights or remedies  shall not  preclude  the
simultaneous  or later  exercise by Landlord of other  rights or  remedies.  All
costs  incurred by  Landlord to collect any Rent and damages or to enforce  this
Lease are also  recoverable  from Tenant.  If any suit is brought  because of an
alleged breach of this Lease,  the prevailing  party is also entitled to recover
from the other  party all  reasonable  attorneys'  fees and  costs  incurred  in
connection therewith.

     20.4 No Waiver. No failure by Landlord to insist upon strict performance of
any provision or to exercise any right or remedy upon a breach  thereof,  and no
acceptance  of full  or  partial  Rent  during  the  continuance  of any  breach
constitutes  a waiver of any such  breach or such  provision,  except by written
instrument executed by Landlord.  No waiver shall affect or alter this Lease but
each  provision  hereof  continues  in effect  with  respect  to any other  then
existing or subsequent breach thereof.

     20.5 Bankruptcy. Nothing contained in this Lease limits Landlord's right to
obtain as liquidated damages in any bankruptcy or similar proceeding the maximum
amount  allowed by law at the time such  damages are to be proven,  whether such
amount is  greater,  equal to, or less than the amounts  recoverable,  either as
damages or Rent, referred to in any of the preceding provisions of this Section.
Notwithstanding  anything  in  this  Section  to the  contrary,  any  proceeding
described  in Section  20.1(5),(6),(7)  and (8) is an Event of Default only when
such proceeding is brought by or against the then holder of the leasehold estate
under this Lease.

     20.6 Late Payment  Charge.  Any Rent not paid within 5 business  days after
the due date shall  thereafter  bear  interest at 5 percentage  points above the
Prime Rate or the highest rate permitted by law, whichever is lower, until paid.
Further,  if such Rent is not paid within 5 business days after  notice,  Tenant
agrees Landlord will incur  additional  administrative  expenses,  the amount of
which will be difficult to determine; Tenant therefore shall also pay Landlord a
late charge for each late  payment of 5% of such  payment.  Any amounts  paid by
Landlord to cure a default of Tenant  which  Landlord  has the right but not the
obligation  to do,  shall,  if not  repaid by Tenant  within 5 days of demand by
Landlord,  thereafter bear interest at 5 percentage  points above the Prime Rate
until paid.  "Prime Rate" means that rate announced by Wells Fargo Bank, N.A. as
its prime rate on the date closest to the date interest commences.

     20.7 Waiver of Jury Trial.  Tenant and Landlord  waive any right to a trial
by jury in suits arising out of or concerning the provisions of this Lease.

     20.8 Self-Help.  Notwithstanding anything in the Lease to the contrary, the
use of force by Landlord or its agents shall not be included  among the remedies
available  to  Landlord.  Landlord  reserves  the right to use  other  self-help
remedies provided that they do not disturb the peace.

     21. DEFAULT BY LANDLORD. In the event of any alleged default on the part of
Landlord,  Tenant shall give notice to Landlord and afford Landlord a reasonable
opportunity to cure such default,  provided  Landlord  commences such cure on or
before the Fifth (5th) day following Tenant's notice and diligently pursues such
cure to completion using commercially  reasonable efforts.  Such notice shall be
ineffective  unless  a copy  is  simultaneously  also  delivered  in the  manner
required  in this  Lease  to any  holder  of a  mortgage  and/or  deed of  trust
affecting   all  or  any  portion  of  the   Building   Complex   (collectively,
"Mortgagee"),  provided  that prior to such notice Tenant has been given written
notice in  accordance  with the notice  provisions of this Lease of the identity
and the address of such  Mortgagee.  Within  such Five (5) day period,  Landlord
shall  provide  written  notice to Tenant of  Landlord's  intended  actions  and
schedule for completion of such cure and regular progress reports  regarding the
same. If Landlord fails to cure such default in accordance with the requirements
set forth above or within 30 days following the notice to Landlord, whichever is
earlier,


                                       16
<PAGE>

then  Mortgagee  shall have an additional 30 days following a second notice from
Tenant or, if such  default  cannot be cured within that time,  such  additional
time as may be necessary to effect a cure,  provided  Mortgagee  commences  such
cure on or  before  the  Fifth  (5th)  day  following  such  second  notice  and
diligently pursues such cure to completion using commercially reasonable efforts
(which  pursuit  shall  include,  without  limitation,   commencing  foreclosure
proceedings  and  seeking  relief in any  applicable  bankruptcy  or  insolvency
proceedings, if necessary to effect such cure). If Landlord fails to cure within
Landlord's cure period,  Tenant shall be entitled to relief against Landlord for
such  default  (other  than  termination  of  the  Lease)  for  so  long  as the
Mortgagee's cure period remains in effect.  If such default involves  Landlord's
failure to make repairs,  provide essential  services,  pay utility bills as are
required under this Lease or any other circumstance that would materially impair
Tenant's  ability to continue  operating  its business on and from the Premises,
then, if such default or failure is not cured within Five (5) days following the
date of such notice to Landlord, Tenant also shall have the right (but shall not
be  obligated  to) to  undertake  such repairs (in such manner as to not to void
applicable  warranties),  provide  services or pay such bills or take such other
actions as are  reasonably  required  to enable  Tenant to avoid  such  material
impairment  and to continue  operating  its business  activities on and from the
Premises  (consistent  with the Permitted Uses under this Lease),  provided that
such  undertakings  by Tenant do not  materially  interfere with such actions by
Landlord to effect a cure as are (1) actually  being  undertaken  by Landlord at
such time and (2) as are equally likely and  expeditious in effecting a complete
cure as those  which  could be taken or are  proposed to be taken by Tenant and,
further provided,  that Tenant's  undertakings to effect a cure do not result in
any permanent  material  damage to the Building or Building  Complex.  As to all
such  undertakings by Tenant,  Landlord shall reimburse Tenant within 30 days of
receipt of Tenant's  invoice the full  amount of such  reasonable  out-of-pocket
costs and  expenses  incurred  by Tenant;  provided,  however,  that if Landlord
disputes  that such default  exists or disputes the  reasonableness  of all or a
portion of the amount to be paid, by notice to Tenant prior to the expiration of
the 30 day period,  then  Landlord  shall have no  obligation  to pay the amount
disputed  until  such  dispute is  determined  by final  decision  of a court or
agreement  of the parties.  If any such repairs will affect the HVAC,  plumbing,
electrical or mechanical  systems of the Building (the "Building Systems "), the
structural  integrity  of  the  Building,  or  the  exterior  appearance  of the
Building,  Tenant  shall use only  those  contractors  used by  Landlord  in the
Building for work on the  Building  Systems,  or its  structure,  provided  that
Landlord  provides Tenant (upon Tenant's  request) with notice  identifying such
contractors  and  any  changes  to the  list of such  contractors,  unless  such
contractors  are  unwilling  or unable to perform  such work or the cost of such
work is not  competitive,  in which event Tenant may utilize the services of any
other qualified  contractors which normally and regularly  performs similar work
on  comparable  buildings.  To the extent any sum thus  reimbursed  to Tenant by
Landlord  represents  an amount that would have been  included in the  Operating
Expenses  of the  Building if paid by  Landlord  to perform  the  obligation  in
question,  Landlord  shall be entitled to include in Operating  Expenses the sum
reimbursed to Tenant.  Tenant's sole additional  remedy will be equitable relief
or actual damages but in no event is Landlord or any Mortgagee  responsible  for
consequential  damages  or lost  profit  incurred  by  Tenant as a result of any
default  by  Landlord.  If  a  Mortgagee,  or  transferee  under  such  Mortgage
(hereafter defined),  succeeds to Landlord's interest as a result of foreclosure
or otherwise,  such party shall not be: (i) liable for any default,  nor subject
to any setoff or defenses  that Tenant may have  against  Landlord  except for a
reimbursement  obligation  arising under this Section as to which such Mortgagee
has been given  notice and the  opportunity  to  dispute as  provided  herein or
except for  obligations  arising or continuing  after the date such Mortgagee or
transferee  succeeds  to  Landlord's  interest;  (ii)  bound  by  any  amendment
(including an agreement for early  termination)  without its consent made at any
time after notice to Tenant that such Mortgage requires such consent;  and (iii)
bound by payment of Rent in advance for more than 30 days.  Tenant agrees to pay
Rent (and will receive  credit under this Lease) as directed in any  Mortgagee's
notice of  Landlord's  default  under the Mortgage  reciting  that  Mortgagee is
entitled to collect Rent.  The terms of Section 7 of this Lease shall be subject
to the terms of this Section.

     22. SUBORDINATION AND ATTORNMENT.

     22.1 This Lease at Landlord's  option will be  subordinate to any mortgage,
deed of trust and related  documents  now or hereafter  placed upon the Building
Complex  (including  all  advances  made  thereunder),  and to  all  amendments,
renewals,  replacements,  or restatements  thereof  (collectively,  "Mortgage").
Tenant  agrees  that no  documentation  other  than this  Lease is  required  to
evidence such subordination, provided, however, that the subordination by Tenant
to any such future mortgage, deed of trust or related documents shall be subject
to Tenant obtaining a non-


                                       17
<PAGE>

disturbance  agreement,  on such lender's standard form agreement,  with changes
are Tenant may  reasonably  require (to the extent such  changes are  consistent
with  provisions  in forms  customarily  executed  by  credit-worthy  full-floor
tenants)  whereby  such lender  agrees,  provided  Tenant is not then in default
under  this  Lease,  that  Tenant's  occupancy  of the  Premises  and rights and
privileges  under this Lease shall not be  disturbed  or impaired in  connection
with any proceeding to enforce or foreclose any such mortgage,  trust  indenture
or other lien and if such party  succeeds to the interests of Landlord by reason
of such proceedings or conveyance in lieu thereof, Tenant shall attorn hereunder
directly to such party;  provided,  however,  such party shall not be (i) liable
for any act or omission of any prior  landlord or (ii) subject to any offsets or
defenses which Tenant might have against any prior landlord,  including Landlord
(but such  limitation  shall not relieve such party from the  responsibility  to
perform the obligations as successor to Landlord applicable during its period of
ownership);  or (iii) bound by any rental  which Tenant might have paid for more
than one (1)  month in  advance  to any  prior  landlord;  or (iv)  bound by any
amendment or modification of the Lease made without its consent.

     22.2 If any Mortgagee elects to have this Lease superior to the lien of its
Mortgage  and gives  notice to Tenant,  this Lease will be deemed  prior to such
Mortgage  whether  this Lease is dated prior or  subsequent  to the date of such
Mortgage or the date of recording thereof.

     22.3 In confirmation of subordination or superior position, as the case may
be, Tenant will execute such documents as may be required by Mortgagee and if it
fails to do so within 10 days after demand,  Tenant hereby irrevocably  appoints
Landlord as Tenant's attorney-in-fact and in Tenant's name, place, and stead, to
do so.

     22.4 Tenant hereby attorns to all successor owners of the Building, whether
such ownership is acquired by sale, foreclosure of a Mortgage, or otherwise.

     22.5 Upon the  execution  hereof,  Tenant and  Landlord's  Mortgagee  shall
execute the form of  nondisturbance  agreement  in the form  attached  hereto as
EXHIBIT J and thereafter Landlord promptly shall provide Tenant such document as
executed by Landlord's Mortgagee.

     23. REMOVAL OF TENANT'S PROPERTY.

     23.1 All movable personal  property of Tenant not removed from the Premises
upon vacation,  abandonment,  or termination of this Lease shall be conclusively
deemed  abandoned and may be sold, or otherwise  disposed of by Landlord without
notice to Tenant and without obligation to account;  Tenant shall pay Landlord's
expenses in connection with such disposition.

     23.2 Tenant shall have the right to collaterally  assign Tenant's  interest
in its furniture,  fixtures,  and equipment that are not considered  part of the
Premises; Landlord agrees to execute documents, subject to Landlord's reasonable
approval,  evidencing  that Landlord does not have a  pre-existing  lien on such
personal property.

     24.  HOLDING  OVER:  TENANCY  MONTH-TO-MONTH.  If, after the  expiration or
termination of this Lease,  Tenant remains in possession of the Premises without
a  written  agreement  as to such  holding  over and  continues  to pay rent and
Landlord  accepts such rent, such  possession is a tenancy from  month-to-month,
subject to all provisions hereof but at a monthly rent equivalent to 150% of the
monthly Rent paid by Tenant immediately prior to such expiration or termination.
Rent shall  continue to be payable in advance on the first day of each  calendar
month. Such tenancy may be terminated by either party upon 10 days' notice prior
to the end of any monthly period. Nothing contained herein obligates Landlord to
accept rent tendered after the expiration of the Term or relieves  Tenant of its
liability under Section 17.

     25. PAYMENTS AFTER  TERMINATION.  No payments by Tenant after expiration or
termination  of this Lease or after any notice  (other than a demand for payment
of money) by  Landlord to Tenant  reinstates,  continues,  extends the Term,  or
affects  any  notice  given to  Tenant  prior to such  payments.  After  notice,
commencement of a suit, or


                                       18
<PAGE>

final  judgment  granting  Landlord  possession  of the  Premises,  Landlord may
collect  any amounts  due or  otherwise  exercise  Landlord's  remedies  without
waiving any notice or affecting any suit or judgment.

     26.  STATEMENT OF  PERFORMANCE.  Tenant and Landlord agree at any time upon
not less than 10  business  days'  written  notice to execute and deliver to the
requesting  party a written  statement  certifying that this Lease is unmodified
and in full force and effect  (or,  if there have been  modifications,  that the
same is in full force and effect as modified  stating the  modifications);  that
there have been no  defaults  by  Landlord or Tenant and no event which with the
giving of notice or passage of time, or both,  would  constitute  such a default
(or, if there have been defaults, setting forth the nature thereof); the date to
which Rent has been paid in advance and such other  information  relating to the
Lease as the requesting party requests. Such statement from Tenant may be relied
upon by a prospective purchaser of Landlord's interest or Mortgagee. The failure
of either party when  requested to timely  deliver such  statement is conclusive
upon the failing party that:  (i) this Lease is in full force and effect without
modification  except as may be represented by the requesting  party;  (ii) there
are no uncured  defaults in the requesting  party's  performance;  and (iii) not
more than 1 month's Rent has been paid in advance.  Upon request, the certifying
party will furnish Landlord an appropriate certificate confirming that the party
signing the statement is authorized to do so.

     27. MISCELLANEOUS.

     27.1 Transfer by Landlord.  The term "Landlord" means so far as obligations
of  Landlord  are  concerned,  only  the  owner of the  Building  at the time in
question and, if any transfer of the title occurs, Landlord herein named (and in
the  case of any  subsequent  transfers,  the  then  grantor)  is  automatically
released  from and after the date of such  transfer of all liability as respects
performance of any obligations of Landlord thereafter to be performed. Any funds
in Landlord's possession at the time of transfer in which Tenant has an interest
will be turned over to the  grantee  and any amount  then due Tenant  under this
Lease will be paid to Tenant.

     27.2 No Merger.  The termination or mutual  cancellation of this Lease will
not work a merger,  and such  termination or cancellation  will at the option of
Landlord either terminate all subleases or operate as an automatic assignment to
Landlord of such subleases.

     27.3  Common  Area Use.  Landlord  may use any of the Common  Areas for the
purposes of completing or making  repairs or  alterations  in any portion of the
Building Complex, subject to the provisions of Section 11.

     27.4  Independent  Covenants.  This Lease is to be  construed as though the
covenants  between  Landlord and Tenant are  independent  and not  dependent and
Tenant is not  entitled to any setoff of the Rent  against  Landlord if Landlord
fails to perform its  obligations;  provided,  however,  the foregoing  does not
impair  Tenant's  right to commence a separate  suit  against  Landlord  for any
default by Landlord so long as Tenant complies with Section 21.

     27.5 Validity of  Provisions.  If any provision is invalid under present or
future laws,  then it is agreed that the remainder of this Lease is not affected
and that in lieu of each provision that is invalid,  there will be added as part
of this  Lease a  provision  as  similar  to such  invalid  provision  as may be
possible and is valid and enforceable.

     27.6 Captions.  The caption of each Section is added for  convenience  only
and has no effect in the construction of any provision of this Lease.

     27.7  Construction.  The  parties  waive  any  rule  of  construction  that
ambiguities are to be resolved  against the drafting party.  Any words following
the words "include,"  "including," "such as," "for example," or similar words or
phrases shall be illustrative only and are not intended to be exclusive, whether
or not language of non-limitation is used.


                                       19
<PAGE>

     27.8 Applicability.  Except as otherwise  provided,  the provisions of this
Lease are  applicable  to and binding upon  Landlord's  and Tenant's  respective
heirs,  successors  and  assigns.  Such  provisions  are also  considered  to be
covenants running with the land to the fullest extent permitted by law.

     27.9  Authority.  Tenant  and the party  executing  this Lease on behalf of
Tenant represent to Landlord that such party is authorized to do so by requisite
action of Tenant and agree,  upon  request,  to deliver  Landlord a  resolution,
similar document, or opinion of counsel to that effect.

     27.10  Severability.  If there is more than one party  which is the Tenant,
the obligations imposed upon Tenant are joint and several.

     27.11  Acceptance  of Keys,  Rent or  Surrender.  No act of Landlord or its
representatives  during the Term,  including any agreement to accept a surrender
of the Premises or amend this Lease,  is binding on Landlord  unless such act is
by a partner,  member or officer of Landlord, as the case may be, or other party
designated  in writing by Landlord as authorized to act. The delivery of keys to
Landlord or its representatives  will not operate as a termination of this Lease
or a surrender of the Premises. No payment by Tenant of a lesser amount than the
entire  Rent owing is other than on account of such Rent nor is any  endorsement
or  statement  on any  check  or  letter  accompanying  payment  an  accord  and
satisfaction.  Landlord may accept payment without prejudice to Landlord's right
to recover the balance or pursue any other remedy available to Landlord.

     27.12 Building Name and Size.  Landlord may change the name of the Building
and as it relates to the Building  Complex other than the  Building:  change the
name,  increase the size by adding  additional  real property,  construct  other
buildings  or  improvements,  change  the  location  and/or  character,  or make
alterations  or  additions  subject  to  the  provisions  of  Section  11.1.  If
additional  buildings are  constructed  or the size is  increased,  Landlord and
Tenant shall execute an amendment that incorporates any necessary  modifications
to  Tenant's  Pro Rata  Share.  Tenant may not use the  Building's  name for any
purpose other than as part of its business address.

     27.13 Diminution of View.  Tenant agrees that no diminution of light,  air,
or view from the Building  entitles  Tenant to any  reduction of Rent under this
Lease,  results in any  liability  of Landlord,  or in any way affects  Tenant's
obligations.

     27.14  Limitation  of Liability.  Notwithstanding  anything to the contrary
contained in this Lease,  Landlord's liability is limited to Landlord's interest
in the Building and Landlord  shall never be  personally  liable for recovery of
any judgment.

     27.15  Non-Reliance.  Tenant  confirms it has not relied on any statements,
representations,  or warranties by Landlord or its representatives except as set
forth herein.

     27.16 Written  Modification.  No amendment or modification of this Lease is
valid or binding unless in writing and executed by the parties.

     27.17 Lender's  Requirements.  Tenant will make such  modifications to this
Lease as may  hereafter  be  required  to  conform  to any  lender's  reasonable
requirements, so long as such modifications do not increase Tenant's obligations
or materially alter its rights, as reasonably determined by Tenant.

     27.18  Effectiveness.  Submission of this  instrument  for  examination  or
signature by Tenant does not  constitute a reservation of or option to lease and
it is not effective unless and until execution and delivery by both Landlord and
Tenant.


                                       20
<PAGE>

     27.19  Survival.  This Lease,  notwithstanding  expiration or  termination,
continues in effect as to any  provisions  requiring  observance or  performance
subsequent to termination or expiration.

     27.20 Time of Essence. Time is of the essence herein.

     27.21 Rules and Regulations.  If rules and regulations are attached hereto,
they are a part of this Lease and Tenant agrees that Tenant and Tenant's  Agents
shall at all times abide by such rules and regulations.

     27.22 Recording.  Tenant will not record this Lease. Recording of the Lease
by or on behalf of Tenant is an Event of Default.

     27.23 Consent.  Where either  party's  consent is required under the Lease,
such consent shall not be unreasonably withheld, delayed or conditioned,  except
as expressly provided.

     28. AUTHORITIES FOR ACTION AND NOTICE.

     28.1  Unless  otherwise  provided,  Landlord  may  act  through  Landlord's
Building Manager or other designated representatives from time to time.

     28.2 All notices or other communications required or desired to be given to
Landlord must be in writing, addressed as set forth in Section 1.10 and shall be
deemed  received  when:  (i) delivered  personally to any officer,  partner,  or
member of Landlord (depending upon the nature of Landlord) or the manager of the
Building (the "Building  Manager")  whose office is in the Building,  or (ii) if
deposited in the United States mail,  postage prepaid,  certified or registered,
return receipt requested, when such notice is received or receipt is refused, or
(iii) if  deposited  with a  nationally  recognized  courier  service  providing
confirmation of receipt,  when such notice is received or receipt is refused, or
(iv) if sent by facsimile  transmission,  when received and oral confirmation by
telephone  of such  receipt  has been  given by the  recipient.  All  notices or
communications  required  or desired to be given to Tenant  must be in  writing,
addressed  as set  forth in  Section  1.13 and shall be  deemed  received  when:
(i) delivered  personally  to  any  officer,  partner,  or  member  of  Landlord
(depending  upon the nature of  Landlord)  or the manager of the  Building  (the
"Building Manager") whose office is in the Building, or (ii) if deposited in the
United States mail,  postage  prepaid,  certified or registered,  return receipt
requested,  when such  notice is  received  or receipt is  refused,  or (iii) if
deposited with a nationally recognized courier service providing confirmation of
receipt,  when such notice is received or receipt is refused, or (iv) if sent by
facsimile transmission, when received and oral confirmation by telephone of such
receipt has been given by the  recipient.  Either party may designate in writing
served as above  provided a different  address to which  notice is to be mailed.
The foregoing does not prohibit notice from being given as provided in the rules
of civil  procedure,  as amended  from time to time,  for the state in which the
Real Property is located.

     29.  PARKING.  Landlord  shall  control  parking in the  Parking  Garage by
Tenant's  employees  and employees of tenants in Plaza II by issuance of parking
passes;  Landlord will make  available the number of parking spaces set forth in
Section 1.9 without  charge for parking by Tenant's  employees by issuing passes
to employees designated by Tenant for the applicable number of spaces.  Landlord
shall have the right to control or limit  parking by visitors to the Building in
a manner  consistent  with  policies  at similar  first-class  buildings  in the
suburban  northern  Virginia area; the visitor spaces for Tenant shall be in the
surface spaces adjacent to the entry to the Building,  as shown on the site plan
attached  as  EXHIBIT  H (which  spaces  shall be a  portion  of the 322  spaces
allocated to Tenant in  accordance  with Section 1.9)  designated  by signage as
visitor  parking  spaces for Tenant's  visitors only (but Landlord shall have no
obligation  to police the use of such visitor  spaces);  the  remaining  parking
spaces  shall be in the  parking  garage  located in the lower level and the 1st
through 4th floors of the  Building  and of the Plaza I Building  (the  "Parking
Garage") and in surface  parking  spaces in the Building  Complex as depicted on
the  attached  EXHIBIT  H.  All  Tenant's  parking  spaces  shall be in and out,
non-assigned,  however, at Tenant's request, Landlord shall label by signage all
spaces  allocated to Tenant (other than  handicapped  spaces) as depicted on the
attached  EXHIBIT H and Tenant  shall have the right to  install  control  gates
limiting


                                       21
<PAGE>

access to Tenant's  parking  spaces on parking level four (subject to Landlord's
reasonable  approval  of such system and  subject to the  provisions  of Section
7.1);  the costs of such  signage  and  control  gates  shall be paid by Tenant.
Notwithstanding the above, Landlord's inability to make such spaces available at
any time for  reasons  beyond  Landlord's  reasonable  control is not a material
breach by Landlord of its obligations  hereunder and Tenant has no rights to use
the parking garage except as provided in this Section.  If Landlord is unable to
make all such spaces available for reasons beyond Landlord's reasonable control,
Landlord  shall  take  reasonable  steps to make all such  spaces  available  as
provided herein.  All vehicles parked in the parking facilities and the personal
property  therein shall be at the sole risk of Tenant,  Tenant's  Agents and the
users of such spaces and  Landlord  shall have no  liability  for loss or damage
thereto for whatever cause.

     30. SUBSTITUTE PREMISES. INTENTIONALLY OMITTED.

     31.  BROKERAGE.  Tenant  represents  it has not  employed  any broker  with
respect to this Lease and has no knowledge of any broker's  involvement  in this
transaction  except those listed in Sections  1.15 and 1.16  (collectively,  the
"Brokers").  Tenant shall  indemnify  Landlord  against any expense  incurred by
Landlord as a result of any claim for  commissions  or fees by any other broker,
finder, or agent, whether or not meritorious, employed by Tenant or claiming by,
through, or under Tenant, other than the Brokers.  Tenant acknowledges  Landlord
is not liable for any  representations  by the Brokers  regarding  the Premises,
Building,  Building Complex, or this Lease.  Landlord represents that it has not
employed  any broker  with  respect to this  Lease and has no  knowledge  of any
broker's involvement in this transaction except those listed in Section 1.15 and
1.16 (collectively,  the "Brokers"). Landlord shall indemnify Tenant against any
expense  incurred by Tenant as a result of any claim for  commissions or fees by
any other broker,  finder,  or agent,  whether or not  meritorious,  employed by
Landlord or claiming by,  through,  or under  Landlord,  other than the Brokers.
Landlord  shall pay  commissions  due  Brokers  in  connection  with this  Lease
pursuant to separate written agreement

     32.  COUNTERPARTS.  This Lease may be executed in two or more counterparts,
each of which  shall be  deemed an  original,  but all of which  together  shall
constitute one and the same instrument.  Any one or more  counterpart  signature
pages may be removed  from one  counterpart  of the Lease and annexed to another
counterpart  of the  Lease to form a  completely  executed  original  instrument
without impairing the legal effect of the signature thereon.

     33.  ADDENDUM/EXHIBITS.  Any Addenda and/or Exhibits referred to herein and
attached hereto are incorporated herein by reference.

     IN WITNESS WHEREOF,  the parties have executed this Lease as of the day and
year first above written and it is effective  upon delivery of a  fully-executed
copy to Tenant.


                                       22
<PAGE>

SAVVIS COMMUNICATIONS  CORPORATION,         WGP  ASSOCIATES,  LLC,  a  Virginia
a Missouri corporation                      limited liability company

                                            By:/s/ Greg Pohle
                                               -----------------
By:/s/ David J. Frear                       Authorized Signatory
   -----------------------                  "Landlord"
Print Name: David J. Frear
           ---------------
Print Title: Executive Vice President
            -------------------------
             Chief Financial Officer

ATTEST:

By:/s/ Steven M. Gallant
   ---------------------
Print Name: Steven M. Gallant
            -----------------
Print Title: Vice President
            -----------------
                  "Tenant"


                                       23
<PAGE>

                                    ADDENDUM

     THIS  ADDENDUM is to that  certain  lease  agreement  (the  "Lease") by and
between WGP ASSOCIATES,  LLC, a Virginia limited liability company ("Landlord"),
and SAVVIS COMMUNICATIONS  CORPORATION, a Missouri corporation ("Tenant"),  with
respect to  approximately  80,580 rentable square feet of space (the "Premises")
in the Building.  In the event of any conflict  between the terms and provisions
of the  Lease  and the  terms and  provisions  of this  Addendum,  the terms and
provisions of this Addendum shall control.

     1. Landlord  grants  Tenant an option (the  "Option") to extend the term of
the Lease for one (1) additional term of five (5) years (the "Option Term"). The
Option applies only to the Premises and is on the following conditions:

     A. Notice of Tenant's  interest in  exercising  the Option must be given to
Landlord  no  earlier  than 12 months  and no later  than 9 months  prior to the
Expiration  Date  ("Tenant's  Notice").  Not later than  thirty  (30) days after
receiving  Tenant's  Notice,  Landlord  will  notify  Tenant  of the  Base  Rent
applicable  during the  Option  Term in  accordance  with  subparagraph  E below
("Landlord's Notice").

     B.  Tenant  shall have 15 days  following  Tenant's  receipt of  Landlord's
Notice  within  which to exercise  the Option for the Option Term by  delivering
written  notice of such  exercise to Landlord at the Base Rent,  allowances  and
concessions, if any, set forth in Landlord's Notice or delivering notice of such
exercise but reserving the right to final  determination  of the Base Rent to be
paid in accordance with  subparagraphs E below ("Tenant's  Dispute Notice").  If
Tenant timely  exercises the Option for the  respective  Option Term,  the Lease
shall be deemed  extended and  thereafter the parties shall execute an amendment
to the Lease setting forth the extension for the Option Term and the rental rate
applicable  upon  determination  of the Base Rent  applicable in accordance with
subparagraph E below.

     C.  Unless  Landlord  is  timely  notified  by Tenant  in  accordance  with
subparagraphs A and B above, it will be conclusively  deemed that Tenant has not
exercised the Option and the Lease will expire in  accordance  with its terms on
the Expiration Date.

     D. Tenant's  rights  pursuant to this  Paragraph are personal to Tenant and
may not be assigned.  Tenant's right to exercise the Option is  conditioned  on:
(i)  Tenant  not  being in  default  at the time of  exercise  or at the time of
commencement  of the Option  Term;  (ii) Tenant not having  subleased or vacated
more than 33% of the Premises or assigned its interest under the Lease as of the
commencement  of the Option Term; and (iii) Tenant having the financial  ability
to perform its  obligations  under the Option Term.  Upon an  assignment  of the
Lease, this Paragraph is null and void.

     E. Following delivery of Tenant's Dispute Notice, Landlord and Tenant shall
promptly initiate  negotiations to determine a mutually acceptable Base Rent. If
the parties  mutually agree upon a Base Rent rate, such agreed rate shall be the
Base Rent rate applicable during the Option Term. If the parties have not agreed
upon the  terms as of the 20th day after the date of  Tenant's  Dispute  Notice,
then Landlord and Tenant shall,  within thirty (30) days after Tenant's delivery
of Tenant's Dispute Notice, agree upon a qualified commercial real estate broker
of good reputation,  having at least five (5) years'  experience in the northern
Virginia  real estate  market;  if  Landlord  and Tenant  cannot  agree upon the
broker, then they shall each select,  within the foregoing  thirty-day period, a
real estate broker who meets the above  qualifications and together such brokers
will then  select as the  arbitrator  a real  estate  broker who meets the above
qualifications (the broker selected shall be deemed the "Arbitrator" hereunder).
Within ten (10)) days of selection of the  Arbitrator,  Landlord and Tenant each
shall state, in writing,  their  determination  of the Prevailing  Market Rental
Rate  supported by the reasons  therefor and shall make  counterpart  copies for
each other and the Arbitrator, under an arrangement for simultaneous exchange of
the  determinations.  The Arbitrator will review each party's declaration of the
Prevailing  Market  Rental  Rate and  select  the one which he  determines  most
accurately  reflects such  Arbitrator's  determination of the Prevailing  Market
Rental Rate.  The  Arbitrator  shall have no right to propose a middle ground or
any


                                        1
<PAGE>

modifications of either of the two proposed  resolutions.  The Base Rent to paid
during the Option Term shall be the Prevailing  Market Rental Rate so determined
and Tenant shall have the right to receive the  allowance  and  concessions,  if
any, set forth in  Landlord's  Notice.  The costs  incurred in  connection  with
engaging the  Arbitrator  shall be shared  equally by Landlord  and Tenant,  and
shall be determined at the time the Arbitrator is selected. For purposes of this
Paragraph, Prevailing Market Rental Rate shall mean the annual amount per square
foot (including the then-current Operating Expenses) that a willing tenant would
pay and a willing landlord would accept following arms-length  negotiations with
respect to an "Assumed  Lease" (as defined below) under the  circumstances  then
obtaining.  "Assumed  Lease" means (i) a lease or renewal  having a commencement
date within 6 months of Tenant's Notice for space of approximately the same size
as the  Premises of the  Building or a  "Comparable  Building,"  as  hereinafter
defined,  located in a portion of the Building or such Comparable Building,  and
with a view and floor  height  similar to the portion of the  Premises for which
Prevailing Market Rental Rate is being determined, for a term equal in length to
the Option Term;  (ii)  assuming  that a real estate  commission is payable with
respect to such lease to the extent a  third-party  commission  with  respect to
extension is agreed or  obligated to be paid by Landlord;  and (iii) taking into
consideration  and making  adjustment  to  reflect  allowances  and  concessions
provided  in  Landlord's  Notice,  if any,  and the  use of the  Base  Operating
Expenses provided in Section 1.5 during the Option Term.  "Comparable  Building"
shall mean any existing building or building hereafter constructed in the Dulles
corridor of northern Virginia which is of a size, location, quality and prestige
comparable  to, and with a size and  efficiency of floor plate,  amenities,  and
with tenants of a stature reasonably comparable with the Building, provided that
appropriate  adjustments  shall be made to adjust for  differences  in the size,
location,  age,  efficiency  of  floorplate,  and  quality  between  such  other
buildings and the Building.

     F. After exercise,  or failure to exercise the Option, Tenant shall have no
further rights to extend the Term.

     2. In accordance with the Work Letter,  as part of the Finish Work,  Tenant
shall have the right to have signage  installed on a monument to be  constructed
by Landlord,  which  monument  shall be  constructed  at Landlord's  cost;  such
signage  shall be subject to  approval by  Landlord  of the exact  location  and
details,  which  approval  shall not be  unreasonably  withheld,  conditioned or
delayed.  Further,  the monument and Tenant's signage on the monument is subject
to  approval  under  Applicable  Law and under  the  declaration  of  protective
covenants  applicable  to the Real Property  (the  "Declaration"),  all of which
approvals shall be diligently pursued by Landlord. The monument,  which shall be
designed  and  constructed  by Landlord at  Landlord's  cost,  is intended for a
building  name/address  identifier for the entire 4 tower Worldgate Plaza I, II,
III,  and IV complex and for tenants of the  complex,  and  notwithstanding  the
above, is not exclusively for Tenant's signage;  however,  Tenant shall have the
right to use 25% of such monument  signage area;  the monument shall not be used
for Tenant's signage if only the Building  name/address  identifier is permitted
on such monument under the  Declaration  and  Applicable  Law. The costs for the
design,  fabrication and installation of such Tenant's signage shall be borne by
Tenant  (subject to the allowance  provisions  of the Work Letter).  Tenant will
bear the costs of removal of any signage at the termination or expiration of the
Lease,  including  restoring or repairing damages to the monument caused by such
removal to the condition at the time of installation.  In addition,  if Landlord
is required at any time to remove any signage,  including any approved  signage,
due to any Applicable Law or if Tenant elects to remove or change the signage at
any time, Tenant shall bear the costs of such change or removal.  Tenant will be
responsible  at its cost to maintain its signage in  reasonably  good  condition
acceptable  to Landlord at  Landlord's  reasonable  discretion;  Landlord  shall
maintain  the  monument  as part of the  Common  Areas and shall  require  other
tenants to maintain  their  respective  signage.  In  addition  to the  monument
signage, Tenant shall have the right to install a corporate  identification sign
on the exterior of the Building facing the Dulles  Toll/Access  Roads out of the
Allowance  or, if there is no balance of the  Allowance  available,  at Tenant's
expense.  Such  Building  signage shall be subject to approval  (including  with
respect to  location,  style,  size,  material,  and method of  application)  by
Landlord,  which approval  shall not be  unreasonably  withheld,  conditioned or
delayed,  and under  Applicable Laws and under the Declaration  (which approvals
shall be  diligently  pursued by  Landlord).  Tenant shall not  otherwise  affix
signage to the outside of the  Building  and no signage  shall be affixed to the
inside of the Building that is visible outside the Building without the approval
of Landlord,  which approval shall not be unreasonably  withheld or delayed. The
rights  granted to Tenant  pursuant to this Paragraph are personal to Tenant and
any assignees (except an assignee  permitted under Section 14.7 of the Lease) or


                                        2
<PAGE>

subtenants  of Tenant have no rights under this  Section.  Tenant shall have the
right to erect temporary construction  identification  signage, at Tenant's sole
cost and expense,  during the period prior to the Commencement  Date identifying
the Building as Tenant's future  location,  subject to approval  (including with
respect to  location,  style,  size,  material,  and method of  application)  by
Landlord  which  approval  shall not be  unreasonably  withheld,  conditioned or
delayed,  and approval under  Applicable Laws and under the  Declaration  (which
approvals shall be diligently pursued by Landlord).

     3.  During  the  Term,  Tenant  shall  have a right  to use the roof of the
Building for the purpose of installing,  maintaining and operating the following
described  equipment  on  a  portion  of  the  roof  of  the  Building  ("Roof")
anticipated  to be within the area  labeled  "(1)" on the roof plan  attached as
part of EXHIBIT I, with the actual  location to be  designated  by Landlord,  in
Landlord's reasonable discretion ("Roof Space"): (1) chillers, as referred to on
EXHIBIT 5 to the Work Letter, to service equipment in the Premises  ("Chillers")
and (2) non-penetrating (or alternative attachment methods approved by Landlord)
microwave/satellite  dishes,  not to exceed  approximately one meter in diameter
(or such  larger  dimensions  as shall be subject to  Landlord's  prior  written
consent, not to be unreasonably withheld, conditioned or delayed) (the "Dishes")
and   antennae   not  to  exceed   approximately   one  meter  in  height   (the
"Antennae")(the  foregoing  height and size  limitations  shall be  exclusive of
dimensions of any customary  pedestals,  platforms,  supports or other  mounting
devic