Document:

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                                                                   EXHIBIT 10.36

                      SECOND AMENDMENT TO LEASE AGREEMENT

     THIS SECOND AMENDMENT TO LEASE AGREEMENT (this "Second Amendment") is dated
                                                     ----------------
as of February 3, 2000, between WESTWOOD CENTER, L.L.C., a Delaware limited
liability company ("Landlord"), and INTERLIANT, INC., (formerly known as Sage
                    --------
Networks, Inc.), a Delaware corporation ("Tenant").
                                          ------

                                   WITNESSETH

     WHEREAS, Landlord entered into a Deed of Lease with Tenant dated as of
February 12, 1999 (the "Original Lease"), whereby Tenant leased from Landlord
                        --------------
certain commercial office premises consisting of 13,171 rentable square feet
(the "Original Premises") located on a portion of the first (1st) floor of the
      -----------------
building consisting of 97,081 rentable square feet and located at 8619 Westwood
Center Drive, Vienna, Virginia (the "Building");
                                     --------

     WHEREAS, Landlord entered into a First Amendment to Lease Agreement with
Tenant dated as of June 28, 1999 (the "First Amendment"), whereby Tenant leased
                                       ---------------
from Landlord the remaining square footage on the first (1st) floor of the
Building (the "First Expansion Space") for a total of 22,270 rentable square
               ---------------------
feet (collectively, with the First Expansion Space, the "Initial Premises") (the
                                                         ----------------
Original Lease, as amended by the First Amendment, is hereinafter referred to as
the "Lease").
     -----

     WHEREAS, Tenant desires to lease from Landlord and Landlord desires to
lease to Tenant the entire fourth (4th) floor of the Building (the "Second
                                                                    ------
Expansion Space"), on the same terms and conditions as contained in the Lease,
---------------
as amended and modified hereby.

     NOW, THEREFORE, in consideration of the premises and agreements herein
contained, the parties hereto agree as follows:

     1.  Defined Terms.  All capitalized terms used and not otherwise defined
         -------------
herein shall have the meanings ascribed to them in the Lease and all exhibits
attached thereto.

     2.  Effective Date.  This Second Amendment shall constitute a present and
         --------------
binding agreement between the parties hereto which shall be effective as of the
date hereof.

     3.  Second Expansion Space.  "Second Expansion Space" with respect to this
         ----------------------
Second Amendment shall mean that portion of the Building on the fourth (4th)
floor of the Building consisting of approximately 25,493 rentable square feet
which is demised hereunder by Landlord to Tenant and which is described and
depicted on Exhibit A attached hereto and made a part hereof. The parties agree
            ---------
that within ninety (90) days after the date hereof, the rentable square footage
of the Second Expansion Space is subject to final field verification by Tenant,
at Tenant's sole cost and expense, in accordance with the standards established
by the Building Owners and Managers Association ("BOMA"), and that the rentals
                                                  ----
based thereon will be adjusted, if necessary, accordingly and retroactively to
the Second Expansion Space Commencement Date.
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     4.  Second Expansion Space Commencement Date.  The Second Expansion Space
         ----------------------------------------
Commencement Date hereunder shall be May 1, 2000.

     5.  Premises.  From and after the Second Expansion Space Commencement Date,
         --------
"Premises" shall mean, in addition to the Initial Premises, as presently
included within the meaning of Premises under the Lease, the Second Expansion
Space.  The definition of Premises as set forth in this Section 5, which as of
the Second Expansion Space Commencement Date shall consist of 47,763 rentable
square feet (subject to the provisions of Section 3 of this Second Amendment),
shall be applicable for all purposes of the Lease, including, but not limited
to, the calculation of Tenant's Share and the calculation of Base and Additional
Rent.

     6.  Tenant's Share.  Commencing upon the Second Expansion Space
         --------------
Commencement Date, "Tenant's Share" shall mean 49.2% (47,763/97,081) which shall
be adjusted, if necessary, in accordance with the verification procedures
outlined in Paragraph 3 hereof.

     7.  Construction of Tenant Improvements.  "Tenant's Work" hereunder shall
         -----------------------------------
mean the construction of the Tenant Improvements within the Second Expansion
Space in accordance with the Approved Plans as defined in Exhibit C to the
Lease.  The Improvement Allowance as set forth in such Exhibit C is hereby
increased to an aggregate $477,630.00, calculated at $10.00 per rentable square
foot of the Premises.  Provided that Tenant maintains all insurance required
under the Lease for the Second Expansion Space, access to the Second Expansion
Space shall be given to Tenant upon the execution of this Agreement  for
purposes of Tenant's performance of Tenant's Work (but not for Tenant's
occupancy thereof).  Tenant hereby acknowledges that $254,930.00 of the
aggregate $477,630.00 of the Improvement Allowance shall be applicable to
Tenant's Work within the Second Expansion Space and Tenant further acknowledges
that Tenant has previously expended the balance of the Improvement Allowance in
the amount of $222,700.00 for Tenant's Work within the Initial Premises.

     8.  Term.  The term of the Lease applicable to the Second Expansion Space
         ----
shall commence on May 1, 2000, and expire one hundred twenty (120) months
thereafter.  The Term of the Lease as set forth in Section 1.3 of the Lease is
hereby amended and modified to be coterminous with the term of the Lease
applicable to the Second Expansion Space; it being the intent of the parties
hereto that the Term of the Lease for the Premises shall expire on April 30,
2010.

     9.  Base Rent.  The annual Base Rent for the Second Expansion Space (which
         ---------
shall be paid in monthly installments as a portion of the "Monthly Base Rent"
under and pursuant to the Lease) for the initial Lease Year of the Term shall be
Twenty Five and 50/100 Dollars ($25.50) per square foot of the Second Expansion
Space.  Pursuant to the provisions of Section 1.5 of the Lease, Base Rent is
"net" of electrical service for the Premises, excluding parking areas and Common
Areas, which will be contracted for and paid directly by Tenant.  As of May 1,
2001, and each subsequent annual anniversary of the Second Expansion Space
Commencement Date thereafter, the Base Rent for the Second Expansion Space shall
be increased to an amount equal to one hundred three percent (103%) of the Base
Rent for the Second Expansion Space for the immediately preceding Lease Year.
The foregoing shall not affect the scheduled escalation of Base Rent for the
initial Premises as originally set forth in the

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Lease, which shall remain as originally contemplated therein (it being the
intent hereof that the Base Rent applicable to the Second Expansion Space shall
be adjusted as of May 1 of each year, the Base Rent applicable to the Original
Premises shall be adjusted as of July 1 of each year and the Base Rent
applicable to the First Expansion Space shall be adjusted as of September 1 of
each year).

     10.  Operating Costs and Real Estate Taxes. The Operating Costs Base Year
          -------------------------------------
(as defined in Section 9.2 of the Lease) and the Real Estate Tax Base Year (as
defined in Section 10.3 of the Lease) with respect to the Second Expansion Space
shall be the calendar year 2000.

     11.  Assignment; Subleasing.  Tenant shall have the right to freely assign
          ----------------------
the Lease or sublet all or any portion of the Premises without the consent of
Landlord; provided, however, Tenant shall remain liable for all obligations
under the Lease and hereunder and shall provide thirty (30) days' prior written
notice to Landlord of such assignment or sublease.  Notwithstanding the
provisions of this Section 11, all other provisions of Section 21 of the Lease
shall remain in full force and effect.

     12.  Renewal Term.  Tenant's rights under Section 51 of the Lease shall
          ------------
include Tenant's option to extend the Lease Term as to the Second Expansion
Space for one (1) extension period of sixty (60) months, provided Tenant
complies with all the requirements set forth in Section 51 of the Lease,
including, but not limited to, written notice to Landlord.  Tenant may exercise
the renewal option set forth in Section 51 of the Lease and herein with respect
to any combination of the following:  (i) the Original Premises, (ii) the First
Expansion Space, and/or (iii) the Second Expansion Space.

     13.  Parking.  From and after the Second Expansion Space Commencement Date
          -------
and for the balance of the Term of the Lease, Tenant shall have the right to use
172 parking spaces located on a surface lot surrounding the Building and in a
two-story parking deck located at the side of the Building, including thirty
(30) parking spaces designated for Tenant's exclusive use, the location of such
reserved spots to be determined by the mutual agreement of Tenant and Landlord.
Landlord shall have no obligation or responsibility whatsoever for enforcing the
exclusive use of such parking spaces in favor of Tenant.

     14.  Signage.  Tenant shall not place any sign on the Premises without
          -------
Landlord's prior written consent; provided, however, Tenant shall have the right
to install its corporate name and/or logo on the exterior of the Building at
Tenant's sole cost and expense, in a location mutually agreed to by Landlord and
Tenant, which location is presently anticipated to be on the fourth (4th) floor
corner on the exterior of the Building.  The form and design of such signage
shall be reviewed and approved by Landlord, whose approval shall not be
unreasonably withheld or delayed, and shall satisfy all applicable laws and
regulations.

     15.  Financial Information.  Upon execution of this Second Amendment but in
          ---------------------
no event later than sixty (60) days thereafter, Tenant shall provide to Landlord
(i) the most current financial statements for the previous two (2) years,
including an income statement, balance sheet, sources and uses of cash and
financial, such statements to be either audited or certified as true and
accurate by the Chief Financial Officer of Tenant, and (ii) a summary of all
outstanding

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installment debt, lines of credit and contingent liabilities in form consistent
with the requirements of Section 36 of the Lease.

     16.  Cleaning Services.  Landlord shall provide, as an additional service
          -----------------
under Section 8.1 of the Original Lease, cleaning Services for the Second
Expansion Space commensurate with a Class-A office building, five (5) nights per
week, exclusive of holidays, the cost of which shall be deemed an Operating Cost
under the Original Lease.

     17.  Building Security and Access.  From and after the Second Expansion
          ----------------------------
Space Commencement Date, Section 42 of the Original Lease is hereby amended to
increase the number of key cards provided to Tenant by Landlord from 100 to 220.
Tenant shall have the right of access to the Premises 24 hours per day, 365 days
per year.

     18.  Notices.  Section 1.7 of the Original Lease is hereby modified to
          -------
reflect that notices to Tenant shall be sent to the following:

                           Interliant, Inc.
                           8619 Westwood Center Drive, Suite 400
                           Tysons Corner, Virginia
                           Attention:  David Link

          With a copy to:  Interliant, Inc.
                           Two Manhattanville Road
                           Purchase, New York  10577
                           Attention:  General Counsel

          With a copy to:  Interliant, Inc.
                           1301 Fannin, #700
                           Houston, Texas  77002
                           Attention:  Finance

     19.  Roof Space.  Tenant shall have the right, pursuant to Section 41 of
          ----------
the Original Lease, of access to and non-exclusive use of up to 625 square feet
of the roof of the Building as depicted on Exhibit B attached hereto for the
                                           ---------
installation of various communication equipment; provided, however, that such
use by Tenant shall not interfere with the use and enjoyment of the Building of
any other tenant in the Building.

     20.  Generator Pads.  (a) Tenant shall have the right of access to and non-
          --------------
exclusive use of a space to be located opposite the current generator pad along
the existing tree line, for the placement of a new generator and diesel tank to
service the Second Expansion Space; provided, however, that such use by Tenant
shall not interfere with the use and enjoyment of the Building of any other
tenant in the Building.

     (b) Tenant shall install the pad for the new diesel fuel tank, which pad
shall measure approximately 25 feet by 11 feet, and the pad for the new
generator, which pad shall measure approximately 34 feet by 12 feet. Tenant
shall erect a brick enclosure surrounding the new

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generator pad and diesel tank, which enclosure shall comply with all applicable
laws, ordinances and regulations and shall fully screen the new generator and
diesel tank from view. Both the installation of the pads and the erection of the
brick enclosures shall be pursuant to plans approved by Landlord prior to the
commencement of any work, which approval shall not be unreasonably withheld,
done in a good and workmanlike manner and remain free of all liens for work
performed.

     (c) Tenant agrees to dismantle the current wood structure surrounding the
current generator pad and Landlord agrees to erect a brick enclosure surrounding
such pad, the design of which shall be mutually agreed upon by the parties
hereto.  Such brick enclosure shall segregate Tenant's generator pad from the
pads of any other tenant and shall be subject to all applicable laws, ordinances
and regulations.

     21.  Electrical Room.  (a) Tenant shall have the right of access to and
          ---------------
non-exclusive use of the electrical room as depicted on Exhibit C attached
                                                        ---------
hereto located on the fourth floor of the Building; provided, however, that such
use by Tenant shall not interfere with the use and enjoyment of any other tenant
in the Building.

     (b) Landlord shall seal, in accordance with the reasonable standards of
Tenant, the interior access door to the electrical room located on the first
floor of the Building.

     (c) Landlord shall install, in accordance with the reasonable standards of
Tenant, a concrete pad in front of, and a door threshold on, the exterior access
door to the electrical room located on the first floor of the Building.

     22.  Complete Agreement; No Other Modification.  The Lease, as amended by
          -----------------------------------------
this Second Amendment, contains the entire agreement of the parties hereto and
no representations, inducements, promises, or agreements, oral or otherwise,
between the parties not embodied herein, shall be of any force or effect.  This
Second Amendment may not be amended, modified, or canceled except by written
agreement executed by both parties.  Except as otherwise expressly set forth
herein, the terms and provisions of the Lease are and shall remain in full force
and effect and the parties by their execution hereof hereby ratify, affirm and
approve the Lease, as amended by the Second Amendment.

     23.  Authority.  Each party represents and warrants that all consents or
          ---------
approvals required of third parties (including, but not limited to, its Board of
Directors) for the execution, delivery and performance of this Second Amendment
have been obtained and each party has the right and authority to enter into and
perform its covenants contained herein.  Upon request by either party, the other
party shall provide evidence of such party's authority to execute and deliver
this Amendment.

     24.  Counterparts.  This Second Amendment may be executed in any number of
          ------------
counterparts, each of which shall be deemed to be an original and all of which
together shall comprise one and the same instrument.

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<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this Second Amendment
on the date and year first above written.

                                     LANDLORD:

WITNESS:                             WESTWOOD CENTER, L.L.C.

/s/ Jeffrey Witek                    By: /s/ J. Martin McCoy
---------------------------              -----------------------------
                                     Name:
                                           ---------------------------
                                     Title:
                                            --------------------------

                                     TENANT:

WITNESS:                             INTERLIANT, INC.

                                     By:
---------------------------              -----------------------------
                                     Name:
                                           ---------------------------
                                     Title:
                                            --------------------------

                                       6<PAGE>

                                                                   Exhibit 10.37

                     THIRD AMENDMENT TO SUBLEASE AGREEMENT

     THIS THIRD AMENDMENT TO SUBLEASE AGREEMENT (the "Amendment") is made and
entered into as of February 10, 2000, by and between EOP-PERIMETER CENTER,
L.L.C., a Delaware limited liability company ("Sublessor"), and INTERLIANT, INC.
(f/k/a SAGE NETWORKS, INC.), a Delaware corporation ("Sublessee").

                                    RECITALS

A.   Sublessor (as successor in interest to Southern Company Services, Inc.) and
     Sublessee are parties to that certain sublease agreement dated May 29, 1998
     (the "Original Sublease") for certain space in the building known as 64
     Perimeter Center East (formerly known as Building 64A) located at 64
     Perimeter Center East, Atlanta, Georgia (the "Building").  The Original
     Sublease has been amended by that certain First Amendment to Sublease
     Agreement dated December 9, 1998 (the "First Amendment") and that certain
     Second Amendment to Sublease Agreement dated October 31, 1999 (the "Second
     Amendment") (the Original Sublease, the First Amendment and the Second
     Amendment are referred to herein collectively as the "Sublease").

B.   The premises demised under the Sublease are located in the Building and
     consist of (i) Suite G-300 (the "Original Sublease Premises"), (ii) the
     "Data Center Expansion Premises" (as defined in the Sublease) on Floor G2
     of the Building, (iii) the "Temporary Office Space" (as defined in the
     Sublease) on the first floor of the Building, and (iv) the "Second
     Amendment Data Center Premises" (as defined in the Sublease) on Floor G2 of
     the Building (the Original Sublease Premises, the Data Center Expansion
     Premises, the Temporary Office Space and the Second Amendment Data Center
     Premises are collectively referred to herein as the "Premises").

C.   Sublessor and Sublessee are currently negotiating the terms of a new lease
     (the "New Lease") for approximately 20,929 square feet (the "New Space")
     located on the 8th floor of the building located at 66 Perimeter Center
     East, Atlanta, Georgia, commonly known as 66 Perimeter Center East.

D.   Pursuant to the Sublease, the term for the Temporary Office Space is
     scheduled to expire on March 15, 2000 (the "Temporary Office Space Prior
     Termination Date"), and the parties desire to extend the term of the
     Sublease, but only as it pertains to the Temporary Office Space, all on the
     terms and conditions hereinafter set forth.

     NOW, THEREFORE, in consideration of the mutual covenants and agreements
herein contained and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Sublessor and Sublessee agree as
follows:

I.   Extension.  The term of the Temporary Office Space is hereby extended for a
     ---------
     period commencing on the day immediately following the Temporary Office
     Space Prior Termination Date and ending on May 15, 2000 (the "Temporary
     Office Space Extended Termination Date"), unless sooner terminated in
     accordance with the terms of the Sublease.  That portion of the term
     commencing on the day immediately following the Temporary Office Space
     Prior Termination Date ("Temporary Office Space Extension Date") and ending
     on the Temporary Office Space Extended Termination Date shall be referred
     to herein as the "Temporary Office Space Extended Term."

II.  Monthly Base Rent. Commencing on the Temporary Office Space Extension Date
     -----------------
     and throughout the remainder of the Temporary Office Space Extended Term,
     Sublessee shall pay Sublessor the sum of $23,569.00 per month (i.e. $21.00
     per rentable square foot in the Temporary Office Space) as Base Rent for
     the Temporary Office Space, plus applicable State sales and use taxes, with
     each installment payable on or before the first day of each month during
     the period beginning on the Temporary Office Space Extension Date and
     ending on the Temporary Office Space Extended Termination Date, prorated
     for any partial month within the Temporary Office Space Extended Term.  All
     such Base Rent shall be payable by Sublessee in accordance with the terms
     of the Sublease.

III. Condition of Temporary Office Space.  Sublessee is in possession of the
     -----------------------------------
     Temporary Office Space and accepts the same "as is" without any agreements,
     representations, understandings or obligations on the part of Sublessor to
     perform any alterations, repairs or improvements.
<PAGE>

                                 Exhibit 10.37

IV.  Contingencies.  This Amendment is expressly contingent on each of the
     -------------
     following occurring on or before February 11, 2000 (the "Contingency
     Date"):

     A.   Sublessee executes and delivers the New Lease to Sublessor in form and
          substance satisfactory to Sublessor; and

     B.   Sublessee delivers to Sublessor the Security Deposit (as defined in
          the New Lease) and all prepaid rental due under the New Lease, all
          strictly in accordance with the terms thereof.

     In the event the foregoing are not satisfied on or before the Contingency
     Date, this Amendment shall be terminated and of no force or effect, and any
     occupancy by Sublessee of the Temporary Office Space after the Prior
     Temporary Office Space Termination Date shall constitute a holdover subject
     to the provisions of Section 26 of the Sublease, and Sublessor shall be
     entitled to exercise any and all remedies available to it as a consequence
     of Sublessee's holdover.

V.   No Renewals.  The extension rights set forth in Section 6 of the First
     -----------
     Amendment have expired or otherwise been satisfied and they no longer
     exist.  Sublessee has no rights to renew the term with respect to the
     Temporary Office Space beyond the date set forth in this Amendment.

VI.  Miscellaneous.
     -------------

     A.   This Amendment sets forth the entire agreement between the parties
          with respect to the matters set forth herein.  There have been no
          additional oral or written representations or agreements.  Under no
          circumstances shall Sublessee be entitled to any Rent abatement,
          improvement allowance, leasehold improvements, or other work to the
          Premises, or any similar economic incentives that may have been
          provided Sublessee in connection with entering into the Sublease,
          unless specifically set forth in this Amendment.

     B.   Except as herein modified or amended, the provisions, conditions and
          terms of the Sublease shall remain unchanged and in full force and
          effect.

     C.   In the case of any inconsistency between the provisions of the
          Sublease and this Amendment, the provisions of this Amendment shall
          govern and control.

     D.   Submission of this Amendment by Sublessor is not an offer to enter
          into this Amendment but rather is a solicitation for such an offer by
          Sublessee.  Sublessor shall not be bound by this Amendment until
          Sublessor has executed and delivered the same to Sublessee.

     E.   The capitalized terms used in this Amendment shall have the same
          definitions as set forth in the Sublease to the extent that such
          capitalized terms are defined therein and not redefined in this
          Amendment.

     F.   Sublessee hereby represents to Sublessor that Sublessee has dealt with
          no broker in connection with this Amendment, other than The Wesley
          Company.  Sublessee agrees to indemnify and hold Sublessor, its
          members, principals, beneficiaries, partners, officers, directors,
          employees, mortgagee(s) and agents, and the respective principals and
          members of any such agents (collectively, the "Sublessor Related
          Parties") harmless from all claims of any brokers claiming to have
          represented Sublessee in connection with this Amendment, other than
          The Wesley Company.  Sublessor hereby represents to Sublessee that
          Sublessor has dealt with no broker in connection with this Amendment,
          other than The Wesley Company.  Sublessor agrees to indemnify and hold
          Sublessee, its members, principals, beneficiaries, partners, officers,
          directors, employees, and agents, and the respective principals and
          members of any such agents (collectively, the "Sublessee Related
          Parties") harmless from all claims of any brokers claiming to have
          represented Sublessor in connection with this Amendment, other than
          The Wesley Company.
<PAGE>

                                 Exhibit 10.37

     IN WITNESS WHEREOF, Sublessor and Sublessee have duly executed this
Amendment as of the day and year first above written.

                              SUBLESSOR:

                              EOP-PERIMETER CENTER, L.L.C., a Delaware limited
                              liability company

                              By:  EOP Operating Limited Partnership, a Delaware
                                   limited partnership, its sole member

                                    By:  Equity Office Properties Trust, a
                                         Maryland real estate investment trust,
                                         its managing general partner

                                         By: /s/ Jeff Sweeney
                                             -----------------------------------

                                         Name:
                                               ---------------------------------

                                         Title: V.P. Leasing
                                                --------------------------------

                              SUBLESSEE:

                              INTERLIANT, INC., a Delaware corporation

                              By: /s/ Jennifer Lawton
                                  ---------------------------------------------

                              Name:
                                    -------------------------------------------

                              Title: Sr. Vice President
                                     ------------------------------------------

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