Document:

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                                                                   Exhibit 10.44

                             FOURTH AMENDMENT TO
                           STANDARD LEASE AGREEMENT

         THIS FOURTH AMENDMENT TO STANDARD LEASE AGREEMENT (this "Amendment") is
made by and between AGBRI FANNIN L.P., a Delaware limited partnership
("Landlord") and INTERLIANT, INC., a Delaware corporation ("Tenant"), formerly
Sage Networks, Inc., a Delaware corporation, effective this the 29/th/ day of
September, 2000 (the "Effective Date").

                              W I T N E S S E T H

         WHEREAS, LaSalle Partners Management Limited (in its capacity as agent
for Fannin Street Limited Partnership, a Delaware limited partnership)
("Fannin"), predecessor in interest to Landlord, and Wolf Communications
Company, a Texas corporation doing business as Interliant ("Wolf"), predecessor
in interest to Tenant, entered into that certain Standard Lease Agreement dated
June 11, 1995 (the "Lease Agreement"), for the lease of approximately 12,312
square feet of Agreed Rentable Area located on Floor 7 of the 1301 Fannin Street
Building ("Building") (the land on which the Building is located is more
particularly described in Exhibit B attached to the Lease Agreement), all in
                          ---------
accordance with the terms, conditions, covenants and obligations contained in
the Lease Agreement; and

         WHEREAS, Fannin and Wolf entered into that certain First Amendment to
Standard Lease Agreement dated effective January 18, 1996, wherein the Premises
were expanded to an aggregate of 23,260 square feet of Agreed Rentable Area on
Floor 7 of the Building;

         WHEREAS, Fannin and Wolf entered into that certain Second Amendment to
Standard Lease Agreement dated effective August 8, 1996, wherein the Premises
were expanded to an aggregate of 59,885 square feet of Agreed Rentable Area on
Floor 7 of the Building (the "Floor 7 Space"), which is currently known as Suite
700 and is comprised of 53,548 square feet of Agreed Rentable Area currently
used for general office space, as shown on the attached Exhibit A-1 (the "Floor
                                                        -----------
7 Office Space"), and 6,337 square feet of Agreed Rentable Area currently used
as a data center and for purposes other than general office space, as shown on
the attached Exhibit A-2 (the "Floor 7 Data Space");
             -----------

         WHEREAS, Landlord succeeded to the interest of Fannin;

         WHEREAS, Wolf, after changing its name to Interliant, Inc., assigned
its interest in the Lease Agreement, as amended, to Tenant, formerly known as
Sage Networks, Inc.;

         WHEREAS, Fannin and Wolf entered into that certain Third Amendment to
Standard Lease Agreement dated effective May 15, 2000 (the "Third Amendment"),
wherein the Premises were expanded to include 6,155 square feet of Agreed
Rentable Area located in the Basement of the Building (the "Third Expansion
Space");
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         WHEREAS, beginning on the Effective Date, Tenant desires to expand the
Premises to include approximately 15,794 square feet of Agreed Rentable Area
located on Floor 22 of the Building, as shown on the attached Exhibit A-3
                                                              -----------
(the "Fourth Expansion Space"), to be used as general office space and known as
Suite 2250, and to extend the Term of the Lease Agreement (as amended heretofore
and by this Amendment, the "Lease") with respect to all of the Floor 7 Space;
and

         WHEREAS, Landlord has agreed to the requested expansion and extension
subject to the terms of this Amendment.

         NOW, THEREFORE, in and for the premises contained in this Amendment and
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, Landlord and Tenant agree to amend the Lease as follows:

1.       Definitions. All capitalized terms used, but not defined, in this
         -----------
         Amendment, have the same meaning given to such terms in the Lease.

2.       Condition Precedent. Tenant's right to expand into the Fourth Expansion
         -------------------
         Space provided for in this Amendment shall be of no force and effect
         unless and until (a) Landlord has entered into an amendment of its
         lease with BNY Information Services, Inc. ("BNY"), in form and
         substance acceptable to Landlord in its sole discretion, in which
         amendment BNY agrees to surrender its rights to the Fourth Expansion
         Space, and (b) Exxon Mobil Corporation ("Exxon") has elected, or has
         been deemed to have elected, not to lease the Fourth Expansion Space
         pursuant to the terms of the Exxon Lease (defined below in the attached
         Rider 3). If Landlord fails to satisfy both of such conditions
         (the"Conditions Precedent") on or before the date fifty (50) days after
         the Effective Date (the "Cancellation Date"), then Tenant, at Tenant's
         option, shall have the right to cancel Tenant's lease of the Fourth
         Expansion Space if the Conditions Precedent are not satisfied within
         ten (10) days after notice to Landlord given on or after the
         Cancellation Date, without affecting this Amendment in any other
         respect except as hereinafter provided. In the event the Conditions
         Precedent are not satisfied or Tenant cancels its right to expand into
         the Fourth Expansion Space pursuant to the provisions of this
         paragraph, Tenant's Pro Rata Share Percentage and the Finish Allowance
         shall be adjusted to take into consideration the deletion of the Fourth
         Expansion Space.

3.       Extension. The Initial Term of the Lease with respect to the Floor 7
         ---------
         Space is extended for a period commencing on November 1, 2000, and
         expiring on November 30, 2007, without extending the Third Expansion
         Space Term, as such term is defined in the Third Amendment, with
         respect to the Third Expansion Space. The extension with respect to the
         Floor 7 Space is subject to all of the terms and conditions of the
         Lease currently in effect, except as modified in this Amendment. In the
         event the Third Expansion Space Term is not extended by a subsequent
         amendment to the Lease, Tenant shall vacate the Third Expansion Space
         on July 1, 2001, strictly in accordance with the terms and provisions
         of the Lease.

                                       2
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4.       Expansion Space. Commencing on the Effective Date and expiring on
         ---------------
         November 30, 2007, Landlord leases to Tenant and Tenant leases from
         Landlord the Fourth Expansion Space. The term "Premises", as defined in
         Item 2 of the Basic Lease Provisions, is amended as of the Effective
         Date to reflect the addition of the Fourth Expansion Space and includes
         approximately 81,834 square feet of Agreed Rentable Area in the
         Building, consisting of 59,885 square feet of Agreed Rentable Area on
         Floor 7, 6,155 square feet of Agreed Rentable Area in the Basement, and
         15,794 square feet of Agreed Rentable Area on Floor 22. The lease of
         the Fourth Expansion Space is subject to all of the terms and
         conditions of the Lease currently in effect, except as modified in this
         Amendment. In the event Landlord determines the Conditions Precedent
         can not be satisfied, Landlord shall have the right, upon notice given
         to Tenant prior to Tenant's cancellation of its right of expansion
         provided for in such paragraph 2 (the "Relocation Notice"), to relocate
         the Fourth Expansion Space from Floor 22 to approximately 15,680 square
         feet of Agreed Rentable Area, plus or minus ten percent (10%), of
         comparable space on any single floor in the Building above Floor 22
         (the "Relocated Space") on the same terms and provisions provided for
         in this Amendment with an appropriate adjustment in the Basic Rent,
         Tenant's Pro Rata Share Percentage, and Finish Allowance to reflect any
         adjustment in the Agreed Rentable Area. Unless Tenant objects to the
         Relocated Space as not being comparable in a notice delivered to
         Landlord within five (5) business days after the date Tenant receives
         the Relocation Notice, the Relocation Space shall be deemed to be
         comparable to the Fourth Expansion Space on Floor 22. Effective on the
         date of the Relocation Notice, the original Fourth Expansion Space
         shall be deleted and replaced with the Relocated Space. In the event of
         such relocation, then the Conditions Precedent shall be deemed to be
         satisfied.

5.       Use of the Fourth Expansion Space. Notwithstanding the provisions of
         ---------------------------------
         Item 11 of the Basic Lease Provisions, the permitted use of the Fourth
         Expansion Space shall be limited to general office use.

6.       Rental and Other Charges.
         ------------------------

         (a) Rent payable with respect to the Floor 7 Space shall be payable as
         provided in the Lease through October 31, 2000. Rent payable with
         respect to the Third Expansion Space shall continue to be payable as
         provided in the Lease through and including the Third Expansion Space
         Expiration Date, as such term is defined in the Third Amendment.

         (b) Commencing on November 1, 2000, Basic Rent for the Floor 7 Space
         shall be as follows:

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<TABLE>
<CAPTION>
                                                            Rate Per Square            Basic              Basic
                       Rental                               Foot of Agreed             Annual            Monthly
                       Period                               Rentable Area               Rent               Rent
                       ------                               -------------               ----               ----
         <S>                                                <C>                         <C>               <C>
         November 1, 2000 - January 31, 2001                    $ 0.00                   $0.00              $0.00

         February 1, 2001 - October 31, 2002                    $24.00                  $1,437,240         $119,770

         November 1, 2002 - October 31, 2005                    $26.50                  $1,586,952         $132,246

         November 1, 2005 - November 30, 2007                   $28.00                  $1,676,784         $139,732
</TABLE>

         (c) Commencing on the Fourth Expansion Space Rental Commencement Date
         (defined below), Basic Rent for the Fourth Expansion Space shall be as
         follows:

<TABLE>
<CAPTION>
                                           Rate Per Square           Basic            Basic
                    Rental                 Foot of Agreed           Annual           Monthly
                    Period                  Rentable Area            Rent              Rent
                    ------                  -------------            ----              ----
         <S>                                <C>                    <C>                <C>
             RCD - April 30, 2004               $22.50             $355,368           $29,614
         May 1, 2004 - November 30, 2007        $23.50             $371,160           $30,930
</TABLE>

         RCD = Fourth Expansion Space Rental Commencement Date

         The Fourth Expansion Space Rental Commencement Date shall be the
         earlier of (i) the date Tenant occupies any part of the Fourth
         Expansion Space for purposes of conducting business, (ii) the date of
         Substantial Completion, as defined in the Work Letter, of the Fourth
         Expansion Space, and (iii) the date ninety (90) days after Landlord
         delivers the Fourth Expansion Space to Tenant for the construction of
         Tenant's improvements pursuant to the Work Letter, which delivery date
         is anticipated to be November 1, 2000.

         (d) Tenant's Pro Rata Share Percentage from and after the Fourth
         Expansion Space Rental Commencement Date shall equal 10.436% (the
         Agreed Rentable Area of the Premises divided by the Agreed Rentable
         Area of the Building, expressed in a percentage). In the event the
         Third Expansion Space Term either (i) terminates pursuant to the terms
         of this Amendment or (ii) expires as a result of the Third Expansion
         Space Term not being extended pursuant to a subsequent amendment to the
         Lease approved by Landlord, the Tenant's Pro Rata Share Percentage from
         the date of such termination or expiration shall be 9.65%.

         (e) Tenant's Operating Expense Stop for the Floor 7 Space and Fourth
         Expansion Space shall equal the actual Operating Expenses for the
         calendar year 2000, grossed up in accordance with subsection 2.202 of
         the Supplemental Lease Provisions (see Article 2, Supplemental Lease
         Provisions), and shall include the first twelve (12) months associated
         with Landlord's operation of the Approximate Garage (defined below)
         after the Fourth

                                       4
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         Expansion Space Rental Commencement Date and the Skybridge (defined
         below) after the date the Skybridge is made available to Tenant,
         pursuant to subsection 2.201(b)(xv) of the Lease as amended pursuant to
         paragraph 10 below.

7.       Condition of Floor 7 Space and Fourth Expansion Space. Tenant has
         -----------------------------------------------------
         inspected the Floor 7 Space and Fourth Expansion Space and shall accept
         the same "as is" without any agreements, representations,
         understandings or obligations on the part of Landlord to perform any
         alterations, repairs or improvements, except that Finish Allowance
         provided for in the Work Letter attached to this Amendment as Exhibit
                                                                       -------
         C-1 (the "Work Letter"). Any construction, alterations or improvements
         ---
         made to the Floor 7 Space or the Fourth Expansion Space by Tenant shall
         be performed in accordance with the terms and provisions of the Work
         Letter and the Lease, including, without limitation, approval of the
         plans, specifications, contractors and subcontractors and construction
         of any improvements in the Floor 7 Space or Fourth Expansion Space.

8.       Building. The definition of the term "Building", as defined in Item
         --------
         1.a. of the Basic Lease Provisions, is deleted in its entirety and
         replaced with the following:

               The "Building" is the structure commonly known as the
               1301 Fannin Street Building, together with all
               improvements and appurtenances, located on the land
               bounded by Fannin, San Jacinto, Polk and Clay Streets
               (Block 294), Houston, Texas and more particularly
               described in Exhibit B attached to the Supplemental
                            ---------
               Lease Provisions (the "Land"), together with all
               appurtenant improvements, including, but not limited
               to, any above-street pedestrian walkway ("Skybridge")
               connecting the Building and the garage known as the
               Fannin Garage located at 1112 Clay Street, Houston,
               Texas.

9.       Redelivery of the Premises. The second sentence of Section 1.3 of the
         --------------------------
         Lease is deleted in its entirety and replaced with the following:

               Tenant shall, within seven (7) days after the
               expiration or earlier termination of this Lease, remove
               from the Premises, at the sole expense of Tenant and
               subject to Landlord's rights therein, including
               Landlord's right to assert its lien therein, any
               equipment, machinery, trade fixtures and personalty
               installed or placed in the Premises by or on behalf of
               Tenant. Notwithstanding the foregoing, Tenant shall
               have the right, but not the obligation, to remove any
               generators, chillers, fuel tanks, UPS or infrastructure
               equipment which is installed or placed in the Premises
               by or on behalf of Tenant. Tenant shall have no
               obligation to remove any other improvements made to the
               Premises by or on behalf of Tenant. Notwithstanding
               anything to the contrary contained herein, Landlord may
               claim as its property any of the Power Equipment, as
               such term is defined in the Work Letter, in which event
               Tenant shall have no obligation to remove same. During
               the last one hundred twenty (120) days of the Lease
               term, Landlord shall advise Tenant in writing, within
               ten (10) days of Tenant's notice to Landlord requesting
               same, whether

                                       5
<PAGE>

               Landlord has an interest in retaining any or all of the
               Power Equipment. Failure by Landlord to notify Tenant
               within such ten (10) day period shall be deemed an
               election by Landlord to claim all of the Power
               Equipment as its property. If Landlord advises Tenant
               in writing of any of the Power Equipment that it will
               not claim as its property, Tenant may, at its sole
               option and expense, remove such items upon or prior to
               the termination of this Lease.

10.      Operating Expenses. Clause (xv) of subsection 2.201(b) of the Lease is
         ------------------
         deleted in its entirety and replaced with the following:

               (xv) maintenance, repair, repaving and operating costs
               associated with the Garage, the garage approximate to
               the Building in which Landlord shall provide Tenant
               parking spaces (the "Approximate Garage"), and the
               Skybridge, if any;

11.      Additional Charges. Subsection 2.201 of the Lease is amended to add as
         ------------------
         subsection (f) the following:

               (f) "Additional Charges" shall mean (i)$1,971 per month
                    from July 1, 2000 through June 30, 2001 (and any
                    extension of the Third Expansion Space Term) for
                    the 215 linear feet of 2 inch conduit from the
                    Floor 7 Space to the Third Expansion Space, as
                    shown on the attached Exhibit B (the "Existing
                                          ---------
                    Conduit"), and (ii) the then current prevailing
                    market rate charged by Landlord per linear foot of
                    conduit in the Building for each linear foot of
                    conduit installed or used by Tenant in the
                    Building for data, voice, computer,
                    telecommunication or other communication cable
                    (whether installed horizontally or vertically, and
                    whether to or from or in the Premises including,
                    without limitation, between portions of the
                    Premises, whether on one or more floors, in common
                    areas above ceiling tiles, in riser closets or
                    from any penetration in the Building and
                    specifically excluding any other uses of conduit
                    including, without limitation, conduits used for
                    electrical wiring, fuel tanks or the Power
                    Equipment), which in no event will be less than
                    the current rate of$9.17 per month ($110 per year)
                    per linear foot for conduit less than 3 inches in
                    diameter and$11.67 per month ($140 per year) per
                    linear foot for conduit at least 3 inches, but no
                    larger than 5 inches, in diameter. Notwithstanding
                    the foregoing, the rate charged by Landlord for
                    the first such conduit larger than 3 inches, but
                    no larger than 5 inches, installed by Tenant
                    between the Floor 7 Space and the Fourth Expansion
                    Space shall be$4.17 per month ($50 per year) per
                    linear foot. For purposes of clarity, the
                    foregoing Additional Charges described in clause
                    "(ii)" above shall only apply to linear feet of
                    conduit running from the Floor 7 Space, the Third
                    Expansion Space, the Fourth Expansion Space, the

                                       6
<PAGE>

                    Roof Space or the Fuel Tank Space to any other of
                    such spaces or another location in the Building,
                    but in no event shall it apply to any linear feet
                    of conduit within the Floor 7 Space, the Third
                    Expansion Space, the Fourth Expansion Space, the
                    Roof Space or the Fuel Tank Space.

12.      Payment Obligations. The first sentence of subsection 2.202 of the
         -------------------
         Lease is deleted in its entirety and replaced with the following:

               In addition to the Basic Rent specified in this Lease,
               Tenant shall pay to Landlord (a) the Additional Charges
               monthly on the first of each month during the term of
               this Lease after receipt of an invoice therefor and (b)
               the Additional Rent, in each calendar year or partial
               calendar year during the term of this Lease, payable in
               monthly installments as hereinafter provided.

13.      Rent Defined. The first sentence of Section 2.3 of the Lease is deleted
         ------------
         in its entirety and replaced with the following:

                   Basic Rent, Additional Rent, Additional Charges and
                   all other sums (whether or not expressly designated
                   as rent) required to be paid to Landlord by Tenant
                   under this Lease (including, without limitation,
                   any sums payable to Landlord under any addendum,
                   exhibit, rider or schedule attached hereto) shall
                   constitute rent and are sometimes collectively
                   referred to as "Rent."

14.      Net of Electricity. On and after the first Conversion Date (defined
         ------------------
         below), the term Premises as used in the first sentence of subsection
         5.103(a) of the Lease shall not include the Floor 7 Data Space and
         Tenant shall be solely responsible for the cost of electricity
         delivered to and consumed within the Floor 7 Data Space. As used in
         this Amendment, the term "Conversion Date" shall mean the date Tenant
         commences using any applicable portion of the Floor 7 Office Space for
         any purpose other than general office use, each such converted portion
         having its applicable Conversion Date. The penultimate sentence of
         subsection 5.103(b) of the Lease is deleted in its entirety and
         replaced with the following:

               As a part of Additional Rent, Tenant shall pay Landlord
               for (i) the cost of the electricity consumed through
               the Submetered Lines within the Floor 7 Data Space
               during any calendar month on and after the first
               Conversion Date, which shall equal the kilowatt hours
               of electricity consumed through the Submetered Lines
               within the Floor 7 Data Space multiplied by the then
               current cost per kilowatt hour of electricity consumed
               by the Building, including, without limitation, demand
               charges (the "Cost Per Kilowatt Hour") and (ii) the
               Excess Consumption Cost, which shall equal the kilowatt
               hours of Excess Consumption multiplied by the Cost Per
               Kilowatt Hour (the aggregate of such costs being the
               "Monthly Submetered Electrical Costs").

                                       7
<PAGE>

15.      Net of Heat and Air Conditioning and Electricity. Notwithstanding the
         ------------------------------------------------
         terms and provisions of Sections 5.1 of the Lease, to the contrary,
         Landlord shall not furnish, or cause to be furnished, HVAC and
         Electricity (defined below) to any portion of the Floor 7 Office Space
         converted, whether in one or more conversions, by Tenant for use as
         data center space or for use other than general office on and after the
         applicable Conversion Date (each portion of the Floor 7 Office Space so
         converted, on and after such conversion, being a "Converted Space") or
         the Equipment Space (defined below) on or after the Equipment Space
         Rental Commencement Date. As used in this paragraph, the term "HVAC and
         Electricity"shall mean the heat and air conditioning and electrical
         services and utilities provided for in subsection 5.102 and 5.103 of
         the Lease, including, without limitation, chilled water, UPS power, and
         alternate electrical power supply from the Building Backup Generators.
         On and after the dates set forth above, Tenant shall procure
         electricity for the Equipment Space and the Converted Space, at
         Tenant's sole cost and expense, from the supplier of electricity to the
         Building, which is currently Reliant Energy/HL&P. To the fullest extent
         permitted by applicable laws, ordinances, regulations and rules,
         Landlord shall have the continuing right, upon thirty (30) days written
         notice from Landlord to Tenant, to change the supplier of electricity
         to the Building, in which event Tenant shall change its electricity
         supplier to the supplier selected by Landlord, so that such electricity
         supplier for the Equipment Space and the Converted Space is always the
         same as for the Building. Notwithstanding the foregoing, Tenant shall
         not be obligated to change its electricity supplier more than seven (7)
         times unless Landlord, at its option, pays for Tenant's costs resulting
         from such change of supplier in excess of the seventh change. Any
         construction required to enable Tenant to so procure such electricity,
         including, by way of example, installation of separate meters, cabling,
         or wiring, shall be effected at Tenant's sole cost and expense and in
         strict compliance with the requirements of the Work Letter and the
         Lease. On and after the first Conversion Date, Tenant shall have the
         right upon notice to Landlord to terminate Landlords obligation to
         furnish, or cause to be furnished, HVAC and Electricity to the Floor 7
         Data Space. At the end of each calendar year, commencing with the year
         in which the first Conversion Date occurs, Tenant shall be entitled to
         receive a credit against Tenant's pro rata share of Operating Expenses
         (the "Electrical Cost Credit") equal to the product obtained by
         multiplying (A) the Per Square Foot Electrical Cost Excess (defined
         below) times (B) the aggregate square feet of Agreed Rentable Area in
         the Floor 7 Data Space and the Converted Space times (C) the Office
         Factor (defined below), but not to exceed Tenant's pro rata share of
         the Operating Expenses payable to Landlord as Additional Rent pursuant
         to subsection 2.201(a)(i) of the Lease; provided, however, if the first
         or any subsequent Conversion Date occurs on a date other than the first
         day of a calendar year, then the calculation with respect to the
         applicable space shall be prorated on a daily basis from the applicable
         Conversion Date for the year in question. Landlord shall include the
         Electrical Cost Credit in the annual statement of Addition Rent
         delivered to Tenant in accordance with subsection 2.203 of the Lease
         and shall credit or pay the Electrical Cost Credit in the same manner
         as an overpayment or underpayment of Additional Rent pursuant to such
         subsection. As used in this Amendment, the term "Per Square Foot
         Electrical Cost Excess" shall mean (i) the actual electrical cost used
         to determine Operating Expenses for the calendar year in question in
         excess of the electrical cost used to determine Tenant's Operating
         Expense Stop divided by (ii) the Agreed Rentable Area of the Building;
         and the term "Office Factor" shall mean

                                       8
<PAGE>

         the rentable square feet of the Building without the add-on factor
         (that is the Agreed Rentable Area of the Building less the Common Area,
         which is currently 603,790 square feet) divided by the Agreed Rentable
         Area of the Building (which is currently 784,143 square feet), which
         Landlord and Tenant acknowledge is currently 77%.

16.      Administrative Fee. The administrative fee provided for in subsection
         ------------------
         5.107 of the Lease is deleted and replaced with an administrative fee
         equal to fifteen percent (15%) of such costs.

17.      Installations of Conduit. Tenant shall not install, or permit any third
         ------------------------
         party to install on its behalf, any conduit in the Building without
         first obtaining Landlord's written approval. In addition to other
         considerations, Landlord's approval of any requested conduit shall be
         limited by the space then available for the installation of any
         requested conduit, as determined by Landlord in its sole discretion,
         without Landlord having any obligation to provide any additional space
         for such installation. Notwithstanding the foregoing, Landlord shall
         approve Tenant's reasonable requests for conduit required to connect
         Tenant's equipment installed in the Equipment Space to the Premises,
         subject to the other provisions of this Amendment and the Lease.
         Landlord hereby approves the Existing Conduit.

18.      Lease Cancellation Options. Section 13.7 of the Lease is deleted in its
         --------------------------
         entirety and shall no longer be of any force and effect.

19.      Building Infrastructure Services. In addition to the Fourth Expansion
         --------------------------------
         Space, Tenant shall lease from Landlord (i) the space designated by
         Landlord on the low rise roof area of the Building, as described on the
         attached Exhibit A-4, for the installation and operation of up to four
                  -----------
         (4) generators, up to four (4) chillers, and related equipment (the
         "Roof Space") and (ii) approximately 1,605 square feet of Agreed
         Rentable Area located in the Basement of the Building, as shown on the
         attached Exhibit A-5, or such lesser amount of such space as required
                  -----------
         for the installation and operation of up to two (2) diesel fuel tanks
         no larger than 10,000 gallons each (the "Fuel Tank Space"). From and
         after the date of Landlord's designation of the Roof Space or final
         determination of the Fuel Tank Space, the Roof Space and Fuel Tank
         Space (together, the "Equipment Space") shall become a part of the
         Premises, as such term is defined in Item 2 of the Basic Lease
         Provisions. Commencing on the Equipment Space Rental Commencement Date
         (defined below), Tenant shall pay Landlord annual rent for the
         Equipment Space calculated at$15.00 per square foot of Agreed Rentable
         Area in the Fuel Tank Space, such rent to be paid monthly in the same
         manner as Basic Rent is paid under the terms of the Lease. The
         Equipment Space Rental Commencement Date shall be the earlier of (i)
         the date eighteen (18) months after the Effective Date and (ii) the
         date of Substantial Completion as such term shall be defined in the
         Equipment Space Work Letter (defined below). If Tenant for any reason
         fails (i) to commence construction of Tenant's improvements in the
         Equipment Space on or before the date nineteen (19) months after the
         Effective Date or (ii) after commencing such construction thereafter
         fails to diligently and continuously pursue Substantial Completion as
         such term is defined in the Equipment Space Work Letter, Landlord shall
         have the right to terminate Tenant's lease of the Equipment Space,
         without liability to Tenant and without affecting the Lease in any
         other respect, if such failure is not cured within thirty (30) days
         after written notice from Landlord

                                       9
<PAGE>

         to Tenant. In addition, if Landlord provides Tenant with notice of
         Tenant's failure to diligently and continuously pursue Substantial
         Completion on more than two (2) occasions, Tenant's subsequent failure
         shall, at Landlord's option, be deemed an incurable event. Tenant shall
         accept the Equipment Space "as is", without any agreements,
         representations, understandings or obligations on the part of Landlord
         to perform any alterations, repairs or improvements, (including,
         without limitation, the cost of any structural support required to
         support any equipment installed in the Equipment Space) or provide any
         allowances or inducements with respect to the applicable Equipment
         Space other than the Finish Allowance provided for in the attached Work
         Letter. Any construction, alterations or improvements made to the
         Equipment Space, including, without limitation, any such structural
         support, shall be performed by Tenant, at Tenant's sole cost and
         expense, in strict compliance with the terms and provisions of the
         Lease and the requirements of a work letter to be entered into between
         Landlord and Tenant substantially in the form of the attached Work
         Letter, except as otherwise provided to the contrary in this paragraph
         (the "Equipment Space Work Letter"). The Equipment Space Work Letter
         shall include, without limitation, provisions for the approval of the
         plans, specifications, contractors and subcontractors, construction of
         any improvements in the Equipment Space, including, without limitation,
         the aesthetics of the enclosure of Tenant's equipment located in the
         Roof Space (the "Roof Enclosure") The Equipment Space Work Letter shall
         not provide for (i) any Construction Plans Review Fees or Construction
         Management Fee, as such terms are defined in the attached Work Letter,
         or (ii) any allowances or inducements in addition to any unused portion
         of the Finish Allowance provided for in the attached Work Letter. Such
         improvements shall include, without limitation, pumps and piping to
         provide fuel to the Roof Space from the Fuel Tank Space and the Roof
         Enclosure. Tenant shall have the right to install gelcell backup
         batteries in an area of the Floor 7 Space approved by Landlord in
         writing, which approval shall not be unreasonably delayed. Landlord
         shall have the right to approve the configuration, placement,
         installation, connection, and type of generators, fuel tank, batteries,
         and other equipment that will be installed by Tenant in the Premises,
         which approval shall not be unreasonably delayed. Tenant shall be
         responsible for and shall pay all costs and expenses of providing,
         installing, maintaining, testing and repairing such equipment.

20.      Renewal Option. By extending the Initial Term as provided for in this
         --------------
         Amendment, Tenant has exercised Tenant's renewal option set forth in
         Rider 1 of the Lease. Therefore, Rider 1of the Lease is deleted in its
         entirety and replaced with the attached Rider 1, which is incorporated
         into this Amendment for all purposes.

21.      Subordinated Right of Opportunity. By leasing the Fourth Expansion
         ---------------------------------
         Space, Tenant has exercised Tenant's right of opportunity and first
         offer set forth in Rider 3 of the Lease. Therefore, Rider 3 of the
         Lease is deleted in its entirety and replaced with the attached Rider
         3, which is incorporated into this Amendment for all purposes.

22.      Termination and Relocation Options. Paragraphs 10(b) and 10(c) of
         ----------------------------------
         the Third Amendment are each deleted in their entirety and shall no
         longer be of any force and effect.

                                       10
<PAGE>

23.      Parking. Paragraph 1 of the Garage Parking Agreement attached to the
         -------
         Lease as Exhibit E is deleted in its entirety and replaced with the
         following:

               1.   Parking Spaces. So long as the Lease shall remain in
                    --------------
                    effect, Tenant or persons designated by Tenant
                    shall have the right (but not the obligation)
                    during the Term of this Lease to rent up to ten
                    (10) unreserved parking spaces. In the event
                    Tenant fails to use any of such parking space for
                    a period in excess of one hundred eighty (180)
                    days, Landlord shall have the right to terminate
                    Tenant's right to any such parking space upon
                    notice to Tenant. Upon such notice, Landlord's
                    obligation to provide such terminated parking
                    spaces shall terminate. Tenant's obligation to pay
                    for such terminated parking spaces shall terminate
                    upon Tenant's return of any key-card, sticker, or
                    other identification or entrance enabling device
                    provided by Landlord. Landlord shall have no
                    obligation to provide Tenant, and Tenant shall
                    have no right to, any parking spaces that are so
                    terminated by Landlord.

         On the Effective Date, the rental rate for unreserved parking
         spaces in the Building is$140.00 per month. In addition,
         Landlord shall provide parking to Tenant in the Approximate
         Garage, commencing on the Fourth Expansion Space Rental
         Commencement Date, under the terms and conditions set forth
         in the Parking Agreement attached to this Amendment as
         Exhibit E-1.
         -----------

         Broker. Tenant represents and warrants that it has not been represented
         ------
         by any broker or agent in connection with the negotiation or execution
         of this document except Cushman Realty Corporation ("Cushman"). Tenant
         shall indemnify and hold harmless Landlord from and against all claims
         (including costs of defense and investigation) of any other broker or
         agent or similar party claiming to have represented Tenant in
         connection with this Amendment. Landlord shall indemnify and hold
         harmless Tenant from and against all claims (including costs of defense
         and investigation) of any broker or agent or similar party claiming to
         have represented Landlord in connection with this Amendment. Landlord
         shall be solely liable for any fee or commission due to be paid to
         Cushman under the Commission Registration Agreement dated June 14,
         2000, entered into between Landlord and Cushman for its services
         rendered in connection with this Amendment.

25.      Consent to Assignment or Sublease. The last two sentences of Section
         ---------------------------------
         11.5 of the Lease are deleted and replaced with the following:

               However, notwithstanding the foregoing and for purposes
               of this Lease, the following shall not be considered
               assignments prohibited hereunder or otherwise require
               Landlord's consent: (1) the dissolution of Tenant (if
               Tenant is a partnership) and immediate reconstitution
               into a partnership or the addition or withdrawal of
               partners, or the reallocation of interests among
               partners of Tenant;

                                       11
<PAGE>

               (2) the dissolution of Tenant (if Tenant is a corporation) and
               the immediate reconstitution of Tenant into a new corporation,
               (3) the addition of stockholders and the withdrawal of
               stockholders in the normal course of Tenant's business, or (4)
               the assignment of this Lease to any successor of Tenant (A) into
               which or with which Tenant is merged or consolidated, (B) arising
               from the transfer of Tenant's interest under this Lease made in
               conjunction with the transfer of a majority of the assets and
               liabilities of Tenant, or (C) arising from the acquisition of the
               assets and liabilities of another corporation by Tenant so long
               as (i) in each of the circumstances described in (1) through (3)
               above the surviving partnership, corporation or assignee shall
               assume all obligations of Tenant hereunder and the surviving
                                                          ---
               partnership, corporation or assignee can demonstrate to
               Landlord's reasonable satisfaction the same or better financial
               strength as possessed by Tenant on the date hereof and (ii) in
               the circumstance described in (3)(C) above Tenant shall
               thereafter include a majority of the partners that were partners
               (in the case of a partnership) or include the same controlling
               shareholders (in the case of a corporation) of Tenant during the
               twelve (12) month period immediately prior to the time of such
               event. The addition and withdrawal of shareholders in the
               corporation which is Tenant shall not be considered an assignment
               prohibited hereunder so long as, both before and after such
               addition or withdrawal, Tenant is an entity whose outstanding
               stock is listed on a recognized security exchange. Further,
               Landlord agrees to not unreasonably withhold, condition or delay
               its consent to any proposed sublease or assignment.

26.      Non-Disturbance Agreement. Section 12.2 of the Lease is amended to add
         -------------------------
         at the end of such Section the following:

               Landlord shall use commercially reasonable efforts, at Tenant's
               cost, to obtain Landlord's mortgagee's then current form of non-
               disturbance agreement for the benefit of Tenant.

27.      Notice. Tenant's address for notices due under this Lease, as set forth
         ------
         in Item 14 of the Basic Lease Provisions, is deleted and replaced with
         the following:

               Interliant, Inc.
               Two Manhattanville Road
               Purchase, New York 10577
               Attention:  General Counsel

28.      Partial Termination Option. On not less than thirty (30) days notice
         --------------------------
         given to Landlord by Tenant on or after the Effective Date, Tenant may
         terminate Tenant's lease of the Third Expansion Space, without
         affecting the Lease in any other respect, provided each of the

                                       12
<PAGE>

         following conditions are fully satisfied: (a) Tenant is not in default
         under the Lease (including the occurrence of an event which with
         notice, lapse of time or both would become a default under the Lease)
         on the date of such termination and (b) Tenant shall fully comply with
         all obligations under the Lease respecting the Third Expansion Space
         through the date of such termination, including, without limitation,
         those provisions relating to the condition of the Third Expansion Space
         and removal of Tenant's personal property therefrom upon termination or
         expiration to the Lease.

29.      Miscellaneous. This Amendment contains the parties' entire agreement
         regarding the subject matter covered by this Amendment and supersedes
         all prior correspondence, negotiations, and agreements, if any, whether
         oral or written, between the parties concerning such subject matter.
         There are no contemporaneous oral agreements, and there are no
         representations or warranties, between the parties not contained in
         this Amendment. The terms and provisions of the Lease shall remain in
         full force and effect, and the Lease, shall be binding upon and shall
         inure to the benefit of the parties hereto, their successors and
         permitted assigns.

         EXECUTED EFFECTIVE as of the day first set forth above.

Landlord:                                    Tenant:
--------                                     ------
AGBRI FANNIN L.P., a Delaware limited        INTERLIANT, INC., a Delaware
partnership                                  corporation

By:  Shidler West Investment
     Corporation, a Delaware corporation,    By:  /s/ Richard H. McDevitt,
     its authorized agent                       ---------------------------
                                                 Richard H. McDevitt,
                                                 Vice President, Finance

By: /s/ [ILLEGIBLE]^^
   -------------------------
Name: [ILLEGIBLE]
     -----------------------
Title:    CEO
      ----------------------

                                       13
<PAGE>

                         TABLE OF EXHIBITS AND RIDERS
                                      TO
                 FOURTH AMENDMENT TO STANDARD LEASE AGREEMENT

Exhibit A-1   Floor 7 Office Space
Exhibit A-2   Floor 7 Data Space
Exhibit A-3   Fourth Expansion Space
Exhibit A-4   Low Rise Roof Area
Exhibit A-5   Fuel Tank Space
Exhibit B     Description of Conduit
Exhibit C-1   Work Letter
              Schedule 1   Improved Portion of the Fourth Expansion Space
              Schedule 2   Unimproved Portion of the Fourth Expansion Space
Exhibit E-1   Parking Agreement

Rider 1       Renewal Option, Single Renewal Term
Rider 3       Subordinate Right of Opportunity
              Schedule 1    Floor 22 Opportunity Expansion Space
              Schedule 2    Floor 23 Opportunity Expansion Space
              Schedule 3    Floor 24 Opportunity Expansion Space

                                       14
<PAGE>

                                                                   Exhibit 10.44

                                  EXHIBIT A-1

                             FLOOR 7 OFFICE SPACE

                           [FLOOR PLAN APPEARS HERE]
<PAGE>

                                                                        EX.10.44

                                  EXHIBIT A-2

                              FLOOR 7 DATA SPACE

                           [FLOOR PLAN APPEARS HERE]
<PAGE>

                                                                        EX.10.44

                                  EXHIBIT A-3

                            FOURTH EXPANSION SPACE

                           [FLOOR PLAN APPEARS HERE]
<PAGE>

                                                                        EX.10.44

                                  EXHIBIT A-4

                              LOW RISE ROOF AREA

                           [FLOOR PLAN APPEARS HERE]
<PAGE>

                                                                        EX.10.44

                                  EXHIBIT A-5

                                FUEL TANK SPACE

                           [FLOOR PLAN APPEARS HERE]
<PAGE>

                                                                        EX.10.44

                                   EXHIBIT B

                            DESCRIPTION OF CONDUIT

                            [GRAPHIC APPEARS HERE]
<PAGE>

                                  EXHIBIT C-1

                                  WORK LETTER

         This Exhibit is attached to and a part of that certain Fourth Amendment
to Standard Lease Agreement dated as of September 29, 2000 (the "Fourth
Amendment"), executed by and between AGBRI FANNIN L.P. ("Landlord"), a Delaware
limited partnership, and INTERLIANT, INC. ("Tenant"), a Delaware corporation.
Any capitalized term not defined herein shall have the meaning assigned to it in
the Lease, as such term is defined in the Fourth Amendment. Landlord and Tenant
agree as follows:

1.        Plans.
          -----

     a.   Construction Plans. Tenant's space planner and engineer, at Tenant's
          ------------------
          expense, will prepare construction plans (such construction plans,
          when approved, and all changes and amendments thereto agreed to by
          Landlord and Tenant in writing, are herein called the "Construction
          Plans") for all of Tenant's improvements requested pursuant to the
          Space Plan (collectively, "Tenant's Improvements"), including the
          design of and color scheme for the Floor 7 Space and Fourth Expansion
          Space, a product specification list for all materials, products,
          finishes and work that Tenant desires that are not Building standard,
          complete detail and finish drawings for partitions, chain-link
          fencing, doors, reflected ceiling, telephone outlets, conduits,
          electrical switches and outlets and Building standard heating,
          ventilation and air conditioning equipment and controls. Within
          fifteen (15) business days after Construction Plans are delivered to
          Landlord, Landlord shall approve (which approval shall not be
          unreasonably withheld or delayed) or disapprove same in writing and if
          disapproved, Landlord shall provide Tenant and Tenant's space planner
          and engineer specific reasons for disapproval. The foregoing process
          shall continue until the Construction Plans are approved by Landlord.
          Tenant shall pay Landlord a fee for the review of the Construction
          Plans by Landlord's engineers and architects ("Construction Plans
          Review Fee") equal to Landlord's reasonable actual out of pocket costs
          to such third party vendors.

     b.   Compliance With Disability Acts. Tenant shall cause the construction
          -------------------------------
          of Tenant's Improvements to be completed such that Tenant, the
          Premises and Tenant's Improvements (as constructed) will be in
          compliance with the Disability Acts. TENANT SHALL INDEMNIFY AND HOLD
          HARMLESS LANDLORD FROM AND AGAINST, AND REIMBURSE LANDLORD FOR AND
          WITH RESPECT TO, ANY AND ALL CLAIMS, LIABILITIES AND
          EXPENSES(INCLUDING, WITHOUT LIMITATION REASONABLE ATTORNEYS' FEES AND
          EXPENSES) INCURRED BY OR ASSERTED AGAINST LANDLORD BY REASON OF OR IN
          CONNECTION WITH ANY VIOLATION OF THE DISABILITY ACTS BY TENANT AND/OR
          TENANT'S IMPROVEMENTS OR THE PREMISES NOT BEING IN COMPLIANCE WITH THE
          DISABILITY ACTS.

                                     C-1-i
<PAGE>

     c.   Changes to Approved Plans. If any re-drawing or re-drafting of any of
          -------------------------
          the Space Plan or the Approved Construction Plans is necessitated by
          Tenant's requested changes (all of which shall be subject to
          Landlord's approval), the expense of any such re-drawing or re-
          drafting required in connection therewith, Landlord's review of such
          redrawing and/or redrafting, and the expense of any work and
          improvements necessitated by such re-drawing or re-drafting will be
          charged to and paid by Tenant.

     d.   Coordination of Planners and Designs. It shall be Tenant's
          ------------------------------------
          responsibility to cause necessary coordination of its agents' efforts
          with Landlord's agents to ensure that no delays are caused to either
          the planning or construction of the Tenant's Improvements.

2.        Construction and Costs of Tenant's Improvements.
          -----------------------------------------------

     a.   Completion of Tenant's Improvements. Tenant shall have complete
          -----------------------------------
          responsibility for all aspects of the construction of Tenant's
          Improvements and the proper and timely completion of Tenant's
          Improvements in accordance with this Work Letter. Tenant shall cause
          all of the Tenant's Improvements to be substantially completed as
          expeditiously as reasonably possible in accordance with the approved
          Construction Plans.

     b.   Costs of Tenant's Improvements. Tenant shall construct the Tenant's
          ------------------------------
          Improvements at Tenant's sole cost and expense; provided, however,
          Landlord shall provide Tenant with an allowance of (i) up to$14.25 per
          square foot ($853,361.25) of Agreed Rentable Area of the Floor 7 Space
          (the "Floor 7 Space Finish Allowance"), plus (ii) up to $10.00 per
          square foot of Agreed Rentable Area ($100,080.00) in the portion of
          the Fourth Expansion Space shown on Schedule 1 attached hereto and
          incorporated herein for all purposes (the "Improved Portion Finish
          Allowance") plus (iii) up to$15.00 per square foot of Agreed Rentable
          Area ($86,790.00) in the portion of the Fourth Expansion Space shown
          on Schedule 2 attached hereto and incorporated herein for all purposes
          (the"Unimproved Portion Finish Allowance"). The Floor 7 Space Finish
          Allowance, Improved Portion Finish Allowance and Unimproved Portion
          Finish Allowance are referred to herein, collectively, as the "Finish
          Allowance." The Finish Allowance shall be disbursed by Landlord, from
          time to time upon Landlord's receipt of satisfactory evidence of
          appropriate expenditures, for payment of the contract sum required to
          be paid to the general contractor engaged to construct Tenant's
          Improvements (the "Contract Sum") and for Tenant's purchase of any
          generator, fuel tank and related conduit, and/or electric transformer
          designated by Tenant in writing to be purchased with the Finish
          Allowance and thereafter purchased with the Finish Allowance and
          installed in the Premises in accordance with the terms of the Fourth
          Amendment (the "Power Equipment"). In addition, Tenant may use the
          Finish Allowance to pay the Construction Management Fee (defined
          below) and the Construction Plans Review Fee, in which event Landlord
          shall release such portion of the Finish Allowance as requested by
          Tenant. Tenant shall pay Landlord a construction management fee

                                    C-1-ii
<PAGE>

          equal to five percent (5%) of the Contract Sum but in no event more
          than $60,000.00 (the "Construction Management Fee"). In computing the
          Construction Management Fee, the purchase cost of equipment for use by
          Tenant in the Premises shall not be included in the Contract Sum. The
          Construction Management Fee is in addition to and shall be invoiced
          separately from the Construction Plans Review Fee, which invoice for
          the Construction Management Fee will be sent to Tenant only after
          Substantial Completion. Tenant's failure to pay the Construction
          Management Fee or Construction Plans Review Fee within ten (10) days
          after Landlord's delivery to Tenant of the invoice therefor shall
          constitute default under the Lease unless Tenant has requested
          Landlord pay same out of the Finish Allowance prior to the end of such
          ten (10) days. Any unused Finish Allowance shall be retained by
          Landlord.

3.        Tenant's Contractor.
          -------------------

     a.   Tenant shall select a general contractor from Landlord's list of
          approved contractors (the "Tenant's Contractor"). Landlord approves
          Burr Computer Environments, Inc. as Tenant's construction consultant.
          Tenant's Contractor shall (and its contract shall provide that it
          shall):

               (1)  be capable of working in harmony with the Landlord's space
                    planners, architects, engineers, contractors, workmen,
                    mechanics, or other agents or independent contractors in the
                    performance of their work ("Landlord's Agents") and shall
                    comply with such reasonable rules and regulations as may be
                    promulgated by Landlord;

               (2)  maintain such payment and performance bonds and insurance in
                    force and effect as may be reasonably requested by Landlord
                    or as required by applicable law; and

               (3)  use reasonable efforts to reach an understanding with
                    Landlord's Agents as to the conduct of their work, including
                    but not limited to those matters relating to hoisting,
                    Building systems, systems interfacing, clean-up, use of
                    temporary utilities, protection of installed materials or
                    equipment, sanitary facilities, temporary heating, lighting
                    and cooling and access to the Premises (it being understood
                    that the Tenant's Contractor shall arrange with and pay to
                    Landlord's Agents an amount, if any, negotiated by such
                    parties in good faith, with respect to such functions and
                    services).

     b.   Tenant's Contractor shall use only subcontractors pre-approved by
          Landlord for all mechanical, electrical, plumbing or fire protection
          work within the Building. Landlord and Tenant agree that only the
          Building approved electrical contractor shall be the electrical
          subcontractor (currently Fisk Electric).

                                    C-1-iii
<PAGE>

     c.   Prior to the Fourth Expansion Space Rental Commencement Date, Tenant,
          Tenant's Contractor and other authorized representatives of Tenant
          shall have the right, during normal business hours, to enter upon the
          Fourth Expansion Space for the purposes of preparing it for
          construction and for construction of Tenant's Improvements. After-
          hours access to the Building, the Fourth Expansion Space and the
          Building's systems, as required for construction of Tenant's
          Improvements in the Fourth Expansion Space, will require prior
          coordination and approval by Landlord. LANDLORD SHALL NOT BE LIABLE
          FOR ANY INJURY, LOSS OR DAMAGE TO ANY OF TENANT'S INSTALLATIONS OR
          DECORATIONS AND NOT INSTALLED BY LANDLORD UNLESS SUCH LIABILITY
          RESULTS FROM THE GROSS NEGLIGENCE OR WILLFUL MISCONDUCT OF LANDLORD'S
          EMPLOYEES OR AGENTS. TENANT SHALL INDEMNIFY AND HOLD HARMLESS LANDLORD
          AND LANDLORD'S AGENTS FROM AND AGAINST AND REIMBURSE LANDLORD FOR AND
          WITH RESPECT TO, ANY AND ALL COSTS, EXPENSES, CLAIMS, LIABILITIES AND
          CAUSES OF ACTION ARISING OUT OF OR IN CONNECTION WITH WORK PERFORMED
          IN THE FLOOR7 SPACE OR THE FOURTH EXPANSION SPACE BY OR ON BEHALF
          OF TENANT EXCEPT IF SAME RESULTS FROM THE GROSS NEGLIGENCE OR WILLFUL
          MISCONDUCT OF LANDLORD'S EMPLOYEES OR AGENTS. Such entry into the
          Fourth Expansion Space by Tenant and the Tenant's Contractor pursuant
          to this Section 3 shall be deemed to be under all of the terms,
                  ---------
          covenants, provisions and conditions of the Lease except the covenant
          to pay Rent. Landlord is not responsible for the function and
          maintenance of Tenant's Improvements.

4.        Substantial Completion. The terms "Substantial Completion" and
          ----------------------
          "Substantially Complete," as applicable, shall mean the earlier of (i)
          the sixty-first (61st) day following delivery of the Fourth Expansion
          Space to Tenant for construction of Tenant's Improvements, or (ii) the
          date that Tenant's Improvements are sufficiently completed in
          accordance with the Construction Plans so that Tenant can reasonably
          use the Fourth Expansion Space for the Permitted Use (as described in
          Item 11 of the Basic Lease Provisions) as determined by Landlord and
          -------        ----------------------
          The Wingfield Sears Group, Inc. When Landlord and The Wingfield Sears
          Group, Inc. consider Tenant's Improvements to be Substantially
          Complete, Landlord's representative and Tenant's representative shall
          conduct a walk-through of the Premises.

5.        Construction Representatives. Landlord's and Tenant's representatives
          ----------------------------
          for coordination of construction and approval of change orders will be
          as follows, provided that either party may change its representative
          upon written notice to the other:

LANDLORD'S REPRESENTATIVE:

     NAME        Mary Stanton
     ADDRESS     1301 Fannin Street, Suite 2400
                 Houston, Texas  77002
     PHONE       713-752-2900

                                    C-1-iv
<PAGE>

TENANT'S REPRESENTATIVE:

     NAME        Yann Palmore
                -------------------------------
     ADDRESS     66 Perimeter Center East
                -------------------------------
                 Atlanta, GA 30346-2295
                -------------------------------
     PHONE       (770) 673-2200
                -------------------------------

                                     C-1-v
<PAGE>

                                                                        EX.10.44

                                  SCHEDULE 1

                Improved Portion of the Fourth Expansion Space

                           [FLOOR PLAN APPEARS HERE]
<PAGE>

                                                                        EX.10.44

                                  SCHEDULE 2

               Unimproved Portion of the Fourth Expansion Space

                           [FLOOR PLAN APPEARS HERE]
<PAGE>

                                  EXHIBIT E-1

                               PARKING AGREEMENT
                   RESERVED AND NON-RESERVED PARKING SPACES

         This Exhibit is attached to and a part of that certain Fourth Amendment
to Standard Lease Agreement dated as of September 29, 2000 (the "Fourth
Amendment"), executed by and between AGBRI FANNIN L.P. ("Landlord"), a Delaware
limited partnership, and INTERLIANT, INC. ("Tenant"), a Delaware corporation.
Any capitalized term not defined herein shall have the meaning assigned to it in
the Lease, as such term is defined in the Fourth Amendment. Landlord and Tenant
agree as follows:

1.   Parking Spaces. So long as the Lease shall remain in effect and subject to
     --------------
     the terms and conditions set forth in this Exhibit, Tenant or persons
     designated by Tenant (each such person, a "Parker") shall have the right
     (but not the obligation), commencing on the Fourth Expansion Space Rental
     Commencement Date, to rent on (i) a reserved basis up to thirty-three (33)
     parking spaces (the "Reserved Parking Spaces") in the Approximate Garage
     during the term of this Lease and (ii) an unreserved and non-exclusive
     basis up to eighty (80) parking spaces (the "Unreserved Parking Spaces") in
     the Approximate Garage during the term of the Lease. (The Reserved Parking
     Spaces and Unreserved Parking Spaces are referred to, collectively, as the
     "Parking Spaces.")

2.   Parking Rent. The rent ("Parking Rent") for the Parking Spaces shall be the
     ------------
     rates from time to time designated by Landlord as standard for Landlord's
     parking spaces in the Approximate Garage for tenants of the Building. On
     the Effective Date, Landlord's current rates in the Approximate Garage for
     tenant's of the Building are$100.00 for each Unreserved Parking Space
     and$150.00 for each Reserved Parking Space. Landlord shall provide Tenant
     at least thirty (30) days notice of any change in the above rates in the
     Approximate Garage and the giving of such notice shall be deemed an
     amendment to this Exhibit and Tenant shall thereafter pay Parking Rent
     adjusted according to the new rates. Tenant shall have the right to
     terminate up to all or any number of the Reserved Parking Spaces or the
     Unreserved Parking Spaces then remaining under lease to Tenant, as the case
     may be, if Landlord adjusts the Parking Rent for the Reserved Parking
     Spaces or the Unreserved Parking Spaces to an amount in excess of the
     Average Rent (defined below) in any twelve (12) month period, commencing
     with the first twelve (12) months after the Fourth Expansion Space Rental
     Commencement Date and continuing with each successive twelve (12) month
     period after each anniversary of the Fourth Expansion Space Rental
     Commencement Date, if Landlord fails to adjust any Parking Rent so changed
     in excess of the applicable Average Rent to an amount equal to or less than
     the Average Rent within thirty (30) days after written notice thereof from
     Tenant to Landlord. As used in this Parking Agreement, the term "Average
     Rent"shall mean the average of the rates charged for reserved or unreserved
     parking other than the Parking Spaces, as the case may be, in the following
     garages: Fannin Garage located at 1112 Clay, Howell Building, 777 Clay
     Garage, First City Center Garage, and Main Garage. For purposes of clarity,
     in the event the Parking Rate for only one category of Parking Spaces is
     increased in excess of the applicable Average Rent,

                                     E-1-i
<PAGE>

         such opportunity to terminate shall be limited to the category of
         Parking Spaces for which the Parking Rate has been adjusted to an
         amount in excess of the Average Rent and not to the other category of
         Parking Spaces. Landlord shall have no obligation to provide Tenant,
         and Tenant shall have no right to, any parking spaces that are so
         terminated by Tenant. All payments of rent for Parking Spaces shall be
         made (i) at the same time as Basic Monthly Rent is due under the Lease
         and (ii) to Landlord or to such persons (for example but without
         limitation, the manager of the Approximate Garage) as Landlord may
         direct from time to time.

 3.      Parking Stickers and Cards. Parking cards, stickers or any other device
         --------------------------
         or form of identification supplied by Landlord to Tenant permitting
         access to the Approximate Garage shall remain the property of Landlord
         and shall not be transferable. There will be a replacement charge
         payable by Tenant equal to the amount posted from time to time by
         Landlord for loss of any magnetic parking card or parking sticker
         issued by Landlord for access to the Approximate Garage. On the
         Effective Date, the current charge for a lost magnetic parking card or
         parking sticker, or any magnetic parking card or parking sticker not
         returned to Landlord on the expiration or termination of Tenant's right
         to any Parking Space, is $25.00 per magnetic parking sticker or parking
         sticker.

 4.      Damage to or Condemnation of Garage. If Landlord fails or is unable
         -----------------------------------
         to provide any Parking Space to Tenant in the Approximate Garage
         because of damage or condemnation, such failure or inability shall
         never be deemed to be a default by Landlord as to permit Tenant to
         terminate the Lease, either in whole or in part, but Tenant's
         obligation to pay rent for any such Parking Space which is not provided
         by Landlord shall be abated for so long as Tenant does not have the use
         of such Parking Space and such abatement shall constitute full
         settlement of all claims that Tenant might otherwise have against
         Landlord by reason of such failure or inability to provide Tenant with
         such Parking Space.

5.       Rules and Regulations. A condition of any parking shall be the Parker's
         ---------------------
         compliance with the rules and regulations of the Approximate Garage
         (the " Approximate Garage Rules and Regulations") promulgated by the
         owner of the Approximate Garage (the"Garage Owner"), a copy of which
         will be delivered to Tenant upon request. Approximate Garage managers
         or attendants are not authorized to make or allow any exceptions to the
         Approximate Garage Rules and Regulations. The Garage Owner shall have
         the right to modify and/or adopt such other generally applicable rules
         and regulations for the Approximate Garage as it deems necessary for
         the operation of the Approximate Garage. The Garage Owner prohibits the
         parking of vehicles in areas designated as "RESERVED" or "TOW AWAY
         ZONE", except as any Parker may be authorized to park in such areas.
         Any unauthorized vehicle of Tenant or any of its officers, employees,
         agents or invitees (individually and collectively, the "Tenant
         Parties") parked in these areas will be towed at Tenant's expense.

6.       Default. Tenant's failure to promptly pay the Parking Rent shall
         -------
         constitute a default under the Lease, and Landlord may, at its option
         and in addition to all other remedies provided for in the Lease,
         terminate Tenant's rights to use the Approximate Garage. Landlord may
         refuse to permit any person who violates the Approximate Garage Rules
         and Regulations to park

                                    E-1-ii
<PAGE>

         in the Approximate Garage, and any violation of the Approximate Garage
         Rules and Regulations shall subject the violating Parker's car to
         removal from the Approximate Garage at the owner's expense. No such
         refusal or removal shall create any liability on Landlord or be deemed
         to interfere with Tenant's right to quiet possession of the Premises.

7.       Indemnity. TENANT WILL INDEMNIFY AND HOLD THE LANDLORD PARTIES HARMLESS
         FROM, AND REIMBURSE THE INDEMNIFIED PARTIES FOR AND WITH RESPECT TO,
         ALL CLAIMS, DEMANDS, ACTIONS, DAMAGES, LOSSES, LIABILITIES,
         OBLIGATIONS, PENALTIES, ACTIONS, JUDGMENTS, SUITS OR OTHER PROCEEDINGS,
         COSTS, EXPENSES OR DISBURSEMENTS OF ANY KIND OR NATURE WHATSOEVER,
         INCLUDING, WITHOUT LIMITATION, REASONABLE ATTORNEY'S FEES, COURT COSTS
         AND DISBURSEMENTS (EACH A "CLAIM" AND COLLECTIVELY THE "CLAIMS") WHICH
         MAY BE IMPOSED ON, INCURRED BY, SUFFERED BY OR ASSERTED AGAINST ANY
         LANDLORD PARTY AS A RESULT OF, ARISING FROM OR IN CONNECTION WITH ANY
         TENANT PARTY'S USE OR OCCUPANCY OF THE APPROXIMATE GARAGE AND/OR ANY
         ACCIDENT, INJURY OR DAMAGE OCCURRING IN CONNECTION WITH SUCH USE OR
         OCCUPANCYREGARDLESS OF WHETHER SUCH CLAIM ARISES IN WHOLE OR IN PART
         FROM THE SOLE NEGLIGENCE, CONCURRENT NEGLIGENCE OR COMPARATIVE
         NEGLIGENCE OF AN INDEMNIFIED PARTY; PROVIDED, HOWEVER, SUCH
         INDEMNIFICATION OF A LANDLORD PARTY BY TENANT SHALL NOT INCLUDE ANY
         CLAIM TO THE EXTENT CAUSED BY THE GROSS NEGLIGENCE OR WILLFUL
         MISCONDUCT OF SUCH LANDLORD PARTY.

                                    E-1-iii
<PAGE>

                                    RIDER 1

                                RENEWAL OPTION
                              SINGLE RENEWAL TERM

         This Rider is attached to and a part of that certain Fourth Amendment
to Standard Lease Agreement dated as of September 29, 2000 (the "Fourth
Amendment"), executed by and between AGBRI FANNIN L.P., a Delaware limited
partnership ("Landlord"), and INTERLIANT, INC., a Delaware corporation
("Tenant"). Any capitalized term not defined herein shall have the meaning
assigned to it in the Lease, as such term is defined in the Fourth Amendment.
Landlord and Tenant agree as follows:

A.   If, and only if, on the Expiration Date and the date Tenant notifies
     Landlord of its intention to renew the term of this Lease (as provided
     below), (i) Tenant is not in default under this Lease, (ii) Tenant then
     occupies, and the Premises then consist of, at least all the 59,885 square
     feet of Agreed Rentable Area on Floor 7 of the Building, and (iii) this
     Lease is in full force and effect, then Tenant (or any approved Assignee
     but not any subtenant of Tenant) shall have and may exercise an option to
     renew this Lease for all of the Premises, or all of any contiguous portion
     thereof which includes not less than the Floor 7 Space, for one (1)
     additional term of seven (7) years (the "Renewal Term") upon the same terms
     and conditions contained in this Lease with the exceptions that (x) this
     Lease shall not be further available for renewal and (y) the rental for the
     Renewal Term shall be the Market Rental Rate (defined below), but in no
     event will the Base Annual Rent for the Renewal Term be less than the Base
     Annual Rent for the last twelve (12) calendar months of the term of the
     Lease. The "Market Rental Rate" is hereby defined to mean the then
     prevailing rents (including, without limitation, those similar to the Basic
     Annual Rent, Additional Charges, and Additional Rent) payable by tenants
     for space in the Building of comparable quality, size, use, utility and
     condition as the Floor 7 Space, taking into consideration all relevant
     factors, including the following:

     (a)  use, location, size and/or floor level(s) of the space in question;

     (b)  tenant improvement or refurbishment allowance to be provided;

     (c)  abatement (including with respect to base rental, operating expenses
          and real estate taxes, and parking charges);

     (d)  relocation/moving allowance;

     (e)  space planning/interior architecture/engineering allowance(s);

     (f)  refurbishment and repainting allowances;

     (g)  any other concessions or inducements;

                                     R-1-i
<PAGE>

     (h)  extent of services provided or to be provided (including overtime
          cooling and heating, plus hourly charges therefor);

     (i)  distinction between "gross" and "net" lease;

     (j)  any other adjustments (including by way of indexes) to base rental;

     (k)  credit standing and financial stature of the tenant;

     (l)  term or length of lease; and

     (m)  the time the particular rental rate under consideration is to become
          effective.

B.   If Tenant desires to renew this Lease, Tenant must notify Landlord in
     writing of its intention to renew on or before the date which is at least
     six (6) months but no more than nine (9) months prior to the Expiration
     Date. Landlord shall, within the next sixty (60) days after Landlord
     receives such notice, notify Tenant in writing of Landlord's determination
     of the Market Rental Rate and Tenant shall, within the next twenty (20)
     days following receipt of Landlord's determination of the Market Rental
     Rate, notify Landlord in writing of Tenant's acceptance or rejection of
     Landlord's determination of the Market Rental Rate. If Tenant timely
     notifies Landlord of Tenant's acceptance of Landlord's determination of the
     Market Rental Rate, this Lease shall be extended as provided herein and
     Landlord and Tenant shall enter into an amendment to this Lease to reflect
     the extension of the term and changes in Rent in accordance with this
     Rider. If (x) Tenant timely notifies Landlord in writing of Tenant's
     rejection of Landlord's determination of the Market Rental Rate or (y)
     Tenant does not notify Landlord in writing of Tenant's acceptance or
     rejection of Landlord's determination of the Market Rental Rate within such
     twenty (20) day period, this Lease shall end on the Expiration Date and
     Landlord shall have no further obligations or liability hereunder.

C.   The Floor 7 Space shall be delivered to Tenant in an "as is" condition.

                                    R-1-ii
<PAGE>

                                    RIDER 3

                       SUBORDINATE RIGHT OF OPPORTUNITY

     This Rider is attached to and a part of that certain Fourth Amendment
to Standard Lease Agreement dated as of September 29, 2000 (the "Fourth
Amendment"), executed by and between AGBRI FANNIN L.P., a Delaware Limited
partnership ("Landlord"), and INTERLIANT, INC., a Delaware corporation
("Tenant"). Any capitalized term not defined herein shall have the meaning
assigned to it in the Lease, as such term is defined in the Fourth Amendment.
Landlord and Tenant agree as follows:

A.   Prior to Landlord's leasing to a third party any of Floor 22 not a part of
     the Fourth Expansion Space, Floor 23, or Floor 24 of the Building, as
     depicted on Schedule 1, Schedule 2, and Schedule 3, respectively, attached
     to this Rider (the"Opportunity Expansion Space"), except for the lease to a
     tenant exercising its right under its lease of space in the Building,
     Landlord shall deliver to Tenant a written statement ("Statement") setting
     forth the name of a prospective tenant interested in all or a portion of
     the Opportunity Expansion Space. Tenant's right of opportunity provided for
     in this Rider 3 is subject and subordinate to the rights existing under
     other tenant leases of the Building as of the date of the above described
     Fourth Amendment, including, without limitation, the right of opportunity
     of Exxon, formerly known as Exxon Corporation, under its Lease Agreement
     with Landlord, as amended (the "Exxon Lease"), and any other expansion
     options, rights of first refusal, rights of opportunity or preferential
     rights. As an example, Landlord shall have no obligation to deliver a
     Statement and provide Tenant the opportunity to lease any portion of the
     Opportunity Expansion Space until Landlord has notified Exxon of its
     opportunity to lease the applicable portion of the Opportunity Expansion
     Space and Exxon has elected, or has been deemed to have elected, not to
     lease the applicable portion of the Opportunity Expansion Space, all in
     accordance with the terms of the Exxon Lease. After Landlord notifies Exxon
     or any other tenant with a superior right to the applicable portion of the
     Opportunity Expansion Space of its opportunity to lease the applicable
     portion of the Opportunity Expansion Space, Landlord shall notify Tenant
     that it has given such notice to Exxon or such other tenant, which notice
     shall identify the applicable portion of the Opportunity Expansion Space.
     Tenant shall have five (5) business days after receipt of the Statement
     within which to notify Landlord in writing that it desires to lease the
     applicable Opportunity Expansion Space (each such written notice is herein
     referred to as a "Notice"). Failure by Tenant to notify Landlord within
     such five (5) business day period shall be deemed an election by Tenant not
     to lease the applicable Opportunity Expansion Space and Landlord shall have
     the right to lease such space to the tenant identified in the Statement. If
     Landlord does not lease such Opportunity Expansion Space to such tenant,
     then Landlord will comply with the provision of this Rider prior to leasing
     such space to any other third party.

B.   The Opportunity Expansion Space shall be leased to Tenant upon all terms
     and conditions of this Lease with the following exceptions: (i) all
     Opportunity Expansion Space shall be delivered to Tenant in "as is"
     condition; (ii) Basic Annual Rent for the Opportunity Expansion Space will
     be determined in accordance with paragraph C of this Rider; (iii) the Basic
     Monthly Rent for the agreed rentable area of the Opportunity Expansion
     Space will be equal to one twelfth (1/12th) of the Basic Annual Rent for
     the Opportunity Expansion Space; (iv) the Opportunity

                                     R-3-i
<PAGE>

     Expansion Space will be improved by Tenant in accordance with paragraph D
     of this Rider; (v) Tenant shall not be entitled to any allowances or
     inducements with respect to the applicable Opportunity Expansion Space; and
     (vi) Basic Annual Rent and Additional Rent with respect to the applicable
     Opportunity Expansion Space shall commence on the earlier to occur of (x)
     the date that Tenant commences use of the applicable Opportunity Expansion
     Space for any purpose or (y) the date sixty (60) days after the date on
     which the applicable Opportunity Expansion Space is made available to
     Tenant for the construction of its improvements in accordance with
     paragraph D of this Rider, provided that the initial date determined under
     this clause (y) shall be adjusted backward (i.e., to an earlier date) by
     one (1) day for each day of Tenant Delay (as defined in the applicable Work
                                                                            ----
     Letter). Upon such rent commencement date, (1) the Agreed Rentable Area of
     ------
     the Premises shall be deemed increased by the agreed rentable area of the
     Opportunity Expansion Space, (2) Basic Annual Rent for the Premises shall
     be deemed increased by an amount equal to the Basic Annual Rent for the
     Opportunity Expansion Space, (3) Basic Monthly Rent for the Premises shall
     be deemed increased to an amount equal to one twelfth (1/12th) of the Basic
     Annual Rent for the Premises (as increased) and (4) Additional Rent for the
     Premises shall be recalculated on the basis of the increased Agreed
     Rentable Area of the Premises.

C.   The Basic Annual Rent for the Opportunity Expansion Space shall be the
     "Market Rental Rate" ( as defined in Rider 1 to the Lease except for the
     substitution of the Opportunity Expansion Space for the Floor 7 Space), but
     in no event will the Base Annual Rent for the Opportunity Expansion Space
     be less than (i) the Base Annual Rent from time to time applicable to the
     Fourth Expansion Space if the applicable Opportunity Expansion Space is
     used for general office or (ii) the Base Annual Rent from time to time
     applicable to the Floor 7 Space if the applicable Opportunity Expansion
     Space is used for data center space or other than general office.

D.   Within fifteen (15) days after Landlord's receipt of a Notice, Tenant and
     Landlord will enter into a Work Letter substantially in the form of Exhibit
                                -----------                              -------
     C-1 attached to the Fourth Amendment, provided that such form shall be
     ---
     amended to (i) set forth appropriate dates and (ii) provide for such other
     matters as are necessary to reflect the agreements of the parties with
     respect to the finish out of the applicable Opportunity Expansion Space.
     Pursuant to the Work Letter, Tenant shall construct or cause to be
                     -----------
     constructed improvements in the applicable Opportunity Expansion Space in
     substantial accordance with construction plans agreed to by Landlord and
     Tenant. The cost of constructing such improvements shall be borne by Tenant
     without any allowances or inducements.

E.   Upon substantial completion of the applicable Opportunity Expansion Space
     improvements, Landlord and Tenant shall execute an Acceptance of Premises
     Memorandum in substantially the form of Exhibit D attached to the Lease. If
                                             ---------
     Tenant occupies any Opportunity Expansion Space without executing the
     Acceptance of Premises Memorandum, Tenant shall be deemed to have accepted
     such Opportunity Expansion Space for all purposes.

                                    R-3-ii
<PAGE>

F.   Within fifteen (15) days after Landlord's receipt of a Notice, Landlord and
     Tenant will enter into an amendment to this Lease reflecting (i) the
     addition of the applicable Opportunity Expansion Space to the Premises,
     (ii) the increase in Basic Annual Rent and Additional Rent payable under
     this Lease, (iii) the increase in Tenant's Building Expense Percentage and
     (iv) such other amendments as are necessary.

G.   Notwithstanding any other provision or inference herein to the contrary,
     Tenant's rights and Landlord's obligations under this Rider shall expire
     and be of no further force or effect on the earliest of (i) the expiration
     or earlier termination of the term of this Lease or (ii) a default by
     Tenant under this Lease.

                                    R-3-iii
<PAGE>

                                                                        EX.10.44

                                  SCHEDULE 1

                     Floor 22 Opportunity Expansion Space

                           [FLOOR PLAN APPEARS HERE]

<PAGE>

                                                                        EX.10.44

                                  SCHEDULE 2

                     Floor 23 Opportunity Expansion Space

                           [FLOOR PLAN APPEARS HERE]

<PAGE>

                                                                        EX.10.44

                                  SCHEDULE 3

                     Floor 24 Opportunity Expansion Space

                           [FLOOR PLAN APPEARS HERE]<PAGE>

                                                                   EXHIBIT 10.45

                     FIRST AMENDMENT TO AGREEMENT OF LEASE

                                    between

                   PURCHASE CORPORATE PARK ASSOCIATES, L.P.

                                      and

                               INTERLIANT, INC.

          This FIRST AMENDMENT TO AGREEMENT TO LEASE (this "Amendment") is made
                                                            ---------
as of the 31/st/ day of May, 2000 between PURCHASE CORPORATE PARK ASSOCIATES,
L.P., a New York limited partnership having an office at Two Manhattanville
Road, Purchase, New York 10577 ("Landlord") and INTERLIANT, INC., a Delaware
                                 --------
corporation, having an office at Two Manhattanville Road, Purchase, New York
10577("Tenant").
       ------

                             W I T N E S S E T H:
                             - - - - - - - - - -

          WHEREAS, Landlord and Tenant entered into that certain Agreement of
Lease (the "Original Lease"), dated as of June 16, 1999, demising a portion of
            --------------
the first (1st) floor designated on Exhibit A annexed hereto (the "demised
                                    ---------                      -------
premises") situated at Two Manhattanville Road, Purchase, New York; and
--------

          WHEREAS, Landlord and Tenant wish to amend the Original Lease to
reflect, among other things, the extension of the lease term, upon the terms and
conditions set forth herein (the Original Lease, as amended hereby, is the
"Lease");
------

          NOW THEREFORE, Landlord and Tenant, for themselves, their heirs,
distributees, executors, administrators, legal representatives, trustees,
successors and assigns, hereby covenant and agree that the Lease be and hereby
is amended in the following respects:

          1.  The term of the Lease with respect to the demised premises shall
be extended from June 30, 2004 (the "Expiration Date") to July 31, 2005 (the
                                     ---------------
"New Expiration Date"; such period the "Extended Term").  The Commencement Date
--------------------                    -------------
remains unchanged.

          2.  During the Extended Term, the Fixed Annual Rent payable under
Section 1.2 of the Lease shall be Forty-Eight Thousand Two Hundred Eighty-Five
00/100 Dollars ($48,285.00).
<PAGE>

          3.  Section 42.1 is hereby deleted in its entirety and replaced with
the following:

          "Tenant shall have the right to extend the term of this
          Lease for one (1) additional term of five (5) years (the
          "Extension Term")."
           --------------

          4.  Section 42.2(iv) is hereby deleted in its entirety and replaced
with the following:

              "(iv)  Simultaneous with the giving of the Extension
Notice hereunder, Tenant shall exercise the extension option contained
in the lease between Landlord and Tenant, dated June 16, 1999
("Interliant II"), for the contiguous space on the first floor."

          5.  All other terms, covenants, conditions and provisions of the
Lease, except as herein expressly amended or modified, shall remain in full
force and effect and are hereby confirmed and ratified by the parties hereto.

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

                                PURCHASE CORPORATE PARK ASSOCIATES, L.P.
                                By: PCPA, LLC, its General Partner

                                By:    /s/ Warren L. Schwerin
                                       ----------------------
                                       Warren L. Schwerin, a Co-
                                       Managing Member

                                INTERLIANT, INC.

                                By:    /s/ Francis J. Alfano
                                       ---------------------
                                Name:  Francis J. Alfano
                                Title: SR. VP

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