Document:

<PAGE>

                         AGREEMENT OF SUB-SUB-SUBLEASE
                         -----------------------------

          This Agreement of Sub-Sub-Sublease, dated as of the 1/st/ day of May
2000, between Philips Electronics North America Corporation, ("Sublandlord")
having an address at 64 Perimeter Center East, Atlanta, GA 37146-7300 and
Interliant, Inc., ("Subtenant") having an address at 64 Perimeter Center East,
Atlanta, GA 30346.

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

          WHEREAS, Southern Company Services, Inc., entered into a lease, as
tenant, with Centennial Equities Corporation and Metropolitan Life Insurance
company (collectively the "Owner"), as landlord, originally dated July 16, 1976,
as amended from time to time thereafter (collectively the "Prime Lease"),
leasing certain space in the certain building now known as 66 Perimeter Center
East, Atlanta, GA 30346 (the "Building"); and

          WHEREAS, by a Sublease Agreement dated the 17/th/ day of May, 1995
(the "Full 64 Sublease"), Geac Computer Systems, Inc. ("Geac"), as sublessee,
entered into an agreement (the "Full 64 Sublease"), with the Southern Company
Services, Inc., as sublessor, to sublease approximately 190,554 rentable square
feet of such space in the Building; and

          WHEREAS, EOP - Perimeter Center, L.L.C. ("Head Tenant") has been
assigned and has assumed all rights, title, interest and obligations of Southern
Company Services, Inc., as sublessor, under the Full 64 Sublease; and

          WHEREAS, by Sublease Agreement dated as of September 1, 1998
("Overlease"), Geac subleased to the Sublandlord the 7/th/ and 8/th/ floors in
the Building; and
<PAGE>

          WHEREAS, Sublandlord wants to sublease 13,447 square feet on the 7/th/
floor of the Building as shown on a floor plan attached hereto and made a part
hereof as "Exhibit A" ("Subpremises") to Subtenant; and
          ----------

          WHEREAS, Subtenant desires to lease from Sublandlord the Subpremises,
on the terms and conditions set forth in this Agreement of Sub-Sub-Sublease
(this Agreement of Sub-Sub-Sublease shall be referred to herein as the
"Sublease").

          NOW, THEREFORE, in consideration of the mutual covenants and
agreements contained herein, Sublandlord and Subtenant hereby agree as follows:

          1.  Demise; Term.  Sublandlord hereby leases to Subtenant and
              ------------
Subtenant hereby rents and hires from Sublandlord the entire Subpremises, for a
term commencing on April 24, 2000  ("Commencement Date").  The term of this
Sublease shall end on August 31, 2001, or such earlier date as this Sublease may
terminate pursuant to the terms hereof, or if earlier terminated pursuant to the
provisions of the Prime Lease, the Full 64 Sublease or the Overlease (the
"Expiration Date").

          2.  Use.  (a)  Subtenant shall use and occupy the Subpremises solely
              ---
for the use set forth in the Overlease.

          3.  Rent.  (a)  Fixed Rent.  As of the Commencement Date, in lieu of
              ----        ----------
any other fixed rent referenced in the Overlease, the Full 64 Sublease or the
Prime Lease, Subtenant shall pay to Sublandlord, on a monthly basis, as fixed
rent (the "Fixed Rent"), twenty-three thousand five hundred thirty-two and
25/100 ($23,532.25) dollars.  On September 1, 2000, the monthly payment of
Fixed Rent shall increase to twenty-four thousand two hundred four and 60/100
($24,204.60) dollars, for the remainder of the term. Notwithstanding the
foregoing, for the period
<PAGE>

from April 24, 2000 through May 14, 2000 the monthly payment of Fixed Rent shall
be reduced by eleven thousand five hundred fifty ($11,550) dollars.

          (b) Additional Rent.  Subtenant agrees to pay to Sublandlord, as
              ---------------
additional rent, Subtenant's Proportional Share of Sublandlord's Operating Costs
set forth in Section 7 of the Overlease, in equal monthly installments at the
same time and in the same manner as Fixed Rent under this Sublease.  For
purposes hereof, Subtenant's Proportional Share means the ratio which has as its
numerator the rentable area  of the Subpremises and as its denominator the
rentable area rented by Sublandlord under the Overlease.  As of the date hereof,
Subtenant's Proportional Share is 32.02%.  Notwithstanding anything to the
contrary set forth in this Sublease, Subtenant shall only pay its Proportional
Shares of Operating Expenses over and above Operating Expenses for calendar year
2000.

          4.  Condition of Subpremises.  Subtenant shall accept the Subpremises
              ------------------------
in its "as is" condition in all respects, except that the Subpremises shall be
delivered with all non-cubicle related furniture removed and in broom clean
condition.

          5.  Time and Place of Payments.  All payments of Fixed Rent and
              --------------------------
Additional Rent shall be payable on the 1/st/ day of the month.  All payments
shall be sent to the office of Sublandlord at the address set forth on page one
of this sublease (or such other place as Sublandlord may designate).  Subtenant
acknowledges that if Fixed Rent and/or Additional Rent payments are not made
within five (5) days, Sublandlord may be unable to meet its obligations under
the Overlease,  accordingly, Subtenant shall pay to Sublandlord a late fee in an
amount equal to two (2%) percent of the amount due, which late fee shall be
payable on demand, and deemed to be additional rent.  Interest shall accrue on
any amount which is not paid within five
<PAGE>

(5) days of its due date at the rate of twelve percent (12%) per annum, or the
highest rate permitted by law, whichever rate is lower.

          6.  Events of Default.  Subtenant shall be in default of this Sublease
              -----------------
if any one or more of the following events (referred to herein as "events of
default") occurs:

          A.  Subtenant shall default in payment of any installments of Fixed
Rent, Additional Rent, or other sums required to be paid by Subtenant under this
Sublease for five (5) days after notice is sent to Subtenant of such default,
and Subtenant shall fail to make payment in full prior to expiration of the five
(5) day notice period; provided, however, if more than two (2) payments due
hereunder in any one (1) calendar year are not made prior to delivery of notice;
then it shall be an event of default hereunder by Subtenant if any subsequent
payment due hereunder is not made within five (5) days of the date when due.

          B.  Subtenant shall default in the observance or performance of any
other covenant or provision of this Sublease and such default continues for
thirty (30) days after notice of such default is sent to Subtenant, and
Subtenant shall fail to cure such default prior to expiration of the thirty (30)
day notice period.

          C.  Subtenant shall make an assignment for the benefit of creditors,
or shall assign or sublet its rights under this Sublease in all or any portion
of the Subpremises.

          D.  A voluntary petition is filed by Subtenant under any laws for the
purpose of adjudication of Subtenant as a bankrupt or the extension of the time
of payment, composition, arrangement, adjustment, modification, settlement or
satisfaction of the liabilities of Subtenant, or the reorganization of Subtenant
under the Bankruptcy Act of the United States or any future laws of the United
States having the same general purpose, or a receiver is appointed for Subtenant
by reason of insolvency or alleged insolvency of Subtenant and is not discharged
<PAGE>

within sixty (60) days; an involuntary petition shall be filed against Subtenant
for such relief and shall not be dismissed within sixty (60) days.

          E.  Subtenant shall default in the performance or observance of any
terms, covenants or conditions of the Prime Lease, the Full 64 Sublease and
Overlease, to the extent such default would constitute a default by Sublandlord
under the terms of the Prime Lease, Full 64 Sublease or Overlease.

          7.  Overlease, the Full 64 Sublease and the Prime Lease.  Attached
              ---------------------------------------------------
hereto as Exhibit B is a copy of the Overlease, and attached hereto as Exhibit C
is a copy the Prime Lease and attached hereto as Exhibit D is a copy of the Full
64 Sublease.  Except as otherwise expressly provided herein, all of the terms,
covenants, conditions and provisions in the Overlease, the Full 64 Sublease and
the Prime Lease are hereby incorporated in and made a part of this Sublease,
and, insofar as applicable, such rights and obligations as are contained in
Overlease, the Full 64 Sublease and the Prime Lease are hereby imposed upon the
respective parties hereto, the Sublandlord herein being substituted for the
"Sublandlord" in the Overlease and Sublessor in the Full 64 Sublease the
Sublandlord being substituted for the "Landlord" in the  Prime Lease, and the
Subtenant herein being substituted for the "Subtenant" in the Overlease and
Sublessee in the Full 64 Sublease and the Subtenant being substituted for
"Tenant" in the Prime Lease. Sublandlord shall provide to Subtenant true and
complete copies of all notices to cure, given to Sublandlord by Geac, Head
Tenant and/or Owner within five (5) business days after receipt.  Sublandlord
shall cooperate with Subtenant in obtaining services provided under the
Overlease, the Full 64 Sublease and the Prime Lease.  In the event the
Overlease, the Full 64 Sublease and/or the Prime Lease is canceled or terminated
prior to the Expiration Date, by involuntary means or by operation of law,
Subtenant hereby agrees that if Head Tenant, Geac, or Owner so
<PAGE>

requests, Subtenant shall make a full and complete attornment for the balance of
the term of the Sublease (subject to the termination rights set forth herein),
which attornment shall be evidenced by an agreement in form and substance
reasonably satisfactory to the party seeking the attornment. Other than in the
event of destruction or condemnation, Sublandlord shall not voluntarily
terminate the Overlease, unless the Subtenant is permitted to attorn.
Sublandlord shall obtain all consents required by the Overlease, the Full 64
Sublease and the Prime Lease for this Sublease.

          8.  Indemnity, Insurance.  Subtenant shall protect, indemnify, and
              --------------------
save Sublandlord harmless from any claims, liability, loss, damages and
expenses, including reasonable attorneys' fees, arising from or relating to (i)
any default by Subtenant under this Sublease; or (ii) the use or occupancy by
the Subtenant of the Subpremises.  Subtenant shall obtain, comprehensive public
liability insurance against claims for personal injury, death and property
damage occurring in or about the Subpremises; such insurance shall afford
minimum protection of three million ($3,000,000) dollars with respect to the
personal injury or death occurring or resulting from one occurrence.  Except as
set forth in this Sublease, all insurance to be obtained by the Subtenant shall
name Sublandlord and Geac  as additional insureds.  All insurance shall be
underwritten by reputable insurance companies authorized to do business in the
State of Georgia.  Subtenant may provide the insurance coverage under a blanket
policy covering more than one location.  Each policy shall contain an
endorsement that such insurance may not be canceled except upon at least thirty
(30) days' prior written notice to Sublandlord.  Subtenant shall deliver
certificates indicating said coverage to Sublandlord within two (2) business
days after execution and delivery of this Sublease.  This clause shall survive
the termination or any cancellation of the term of this Sublease.   Subtenant
hereby waives all right of recovery which it might have against the
<PAGE>

Sublandlord for (i) loss or damage to Subtenant's furniture, inventory,
furnishings, fixtures, equipment, chattels and articles of personal property
located on the Subpremises or any injury to any person; (ii) acts or omissions
of other tenants in the Building or other persons in the Building; or (iii)
conditions of the Subpremises whatsoever, except for such loss or damage which
may result from the negligence or fault of Sublandlord. Subtenant shall obtain
insurance covering its furnishings, inventory, fixtures, equipment and articles
of personal property in the Subpremises. For purposes of the Swap Space (as
defined below), all obligations of Subtenant in this Article 8 to obtain
comprehensive public liability insurance, shall be deemed to apply to
Sublandlord in its capacity as an occupant of the Swap Space. Sublandlord shall
endeavor in good faith to name Subtenant as an additional named insured.

          9.  Assignment and Subletting.  Subtenant may not assign, mortgage or
              -------------------------
encumber its interest in this Sublease, or further sublet all or any portion of
the Subpremises.

          10.  Alterations and Repairs; Care of the Subpremises.  Subtenant
               ------------------------------------------------
shall make or cause to be made all non-structural repairs to the Subpremises as
required in the Overlease  Subtenant shall make no alterations, installations,
additions or improvements (collectively, "Alterations") in or about the
Subpremises except in conformance with the terms of the Overlease and with the
prior written consent of Sublandlord which consent will not be withheld if the
necessary consents under the Overlease have been obtained by Subtenant.  In any
event, Sublandlord will not unreasonably withhold or delay its consent to any
request by Subtenant to make Alterations so long as the Alteration requested is
not prohibited by the terms of the Overlease.  Subtenant, at its sole cost and
expense, shall be required to obtain all necessary consents required under the
Overlease and the Sublease prior to the performance of any Alterations.  To the
extent required under the Overlease, Subtenant shall at the end of the term of
the Sublease, remove any
<PAGE>

Alterations which Subtenant made to the Subpremises. The foregoing
notwithstanding, Sublandlord, at its own cost and expense, shall be responsible
for removing any demising walls and emergency door exits which Subtenant
installs in the Subpremises during the term of the Sublease in order to satisfy
local fire codes. No later than the last day of the term of the Sublease,
Subtenant will remove Subtenant's personal property and repair injury done by,
or in connection with, installation or removal of said property and surrender
the Subpremises in as good a condition as at the beginning of the term of the
Sublease, reasonable wear and tear, unrepaired casualty and condemnation
excepted. All property of Subtenant remaining in the Subpremises after
expiration, or earlier termination of the term, shall be deemed conclusively
abandoned and may be removed by Sublandlord, and Subtenant shall reimburse
Sublandlord for the reasonable cost of removing the same. In addition to the
foregoing, in the event that Subtenant fails to vacate the Subpremises on or
before the expiration or earlier termination of the Sublease, Subtenant shall be
deemed to be holding over and Sublandlord shall have all remedies available at
law and equity resulting from Subtenant's holding over. All Alterations to be
performed by Subtenant must comply with all applicable laws, statutes,
ordinances, orders, regulations and requirements of all applicable Federal,
state and local governmental, public or quasi-public authorities. Subtenant
shall maintain the Subpremises and the fixtures and appurtenances thereto in at
least the same condition that existed on the Commencement Date and will not
commit or permit waste therein. Subtenant must provide its own hardware,
including, without limitation, cabling, computers and telephone equipment, to
serve the Subpremises. Subtenant is permitted to use the existing furniture
workstations in the Subpremises from the Commencement Date until May 15, 2000,
subject to reasonable extension at Subtenant's request. Upon expiration of the
time period for Subtenant to use the existing furniture workstations, the
<PAGE>

parties will reasonably cooperate regarding removal of such furniture so as not
to unreasonably interfere with the business operations of Subtenant. Sublandlord
shall promptly remove the existing workstations when requested by Subtenant.
Subtenant shall be entitled to dismantle the workstations and store them in
Subtenant's space at the Building, or at 64 Perimeter Center East. If Subtenant
stores the workstations, Sublandlord shall promptly remove the workstations from
the storage area.

          11.  Violations.   Subtenant shall do whatever is necessary to remove
               ----------
any violations issued by any Federal, State or local governmental or quasi-
governmental agencies or units, within the period of time proscribed in the
notice from the governmental agency or unit accompanying such violation.  The
aforesaid shall only apply to violations issued or which accrued during the term
of this Sublease and which are issued with respect to the Subpremises.

          12.  Brokerage Indemnity.  Sublandlord and Subtenant represent that
               -------------------
neither party has dealt with any broker in connection with this Sublease and
negotiations thereof except for Mabile Carter, LLC and The Wesley Company
(collectively referred to herein as the "Broker").  Each party (the
"Indemnitor") shall indemnify and hold harmless the other party (the
"Indemnitee") from and against any claim, loss or liability incurred by the
Indemnitee, or to which the Indemnitee shall be subject, and all costs and
expenses in connection therewith, including reasonable attorney's fees, that
shall be based upon a breach by the Indemnitor of the foregoing representation.
Sublandlord shall pay The Wesley Company pursuant to a separate agreement.
Sublandlord represents that no commission is due and payable to Mabile Carter,
LLC.

          13.  Sublandlord's Use of Subtenant's Ground Floor Space.  Sublandlord
               ---------------------------------------------------
shall be entitled to use the space currently leased by Subtenant on the ground
floor at 64 Perimeter Center East ("Swap Space").  Sublandlord shall be entitled
to use the Swap Space from the
<PAGE>

Commencement Date through and including May 14, 2000. All of Subtenant's rights
with regard to the Swap Space shall expire as of May 14, 2000. Sublandlord
represents and warrants that it has a direct lease with the Head Tenant for the
Swap Space and that the direct lease commences on May 15, 2000 and that it will
not need to vacate the Swap Space. Sublandlord further represents that its
continued occupancy of the Swap Space after May 14, 2000 will not result in
Subtenant holding over after expiration of its term. Sublandlord accepts the
Swap Space in its "as is" condition. Sublandlord shall leave the Swap Space in
broom clean condition. Sublandlord hereby agrees to indemnify and defend
Subtenant from any claims arising from Sublandlord's use and occupancy of the
Swap Space. Sublandlord shall obtain insurance on the Swap Space in the amounts
in accordance with the terms of Article 8 above. Subtenant and Prime Tenant
shall be named as additional insureds. Except as set forth above, Sublandlord
shall comply with all terms of Subtenant's lease for the Swap Space.

          14.  Parking, Signage, Security and Training Room.  Subtenant shall be
               --------------------------------------------
entitled to fifty-four (54) of the parking spaces to which Sublandlord is
entitled to under the Overlease.  Subtenant shall be entitled to use the
training room at the Building to the extent Sublandlord is entitled under the
Overlease.  Sublandlord shall make appropriate arrangements so that Subtenant
shall be entitled to get electronic pass cards for the Building (and to the
extent referred in Article 13 of the Overlease).  Subtenant shall pay for the
cost of the electronic pass cards.  Subtenant shall be entitled to the use of
the signage located on the Seventh (7/th/) Floor which is being utilized by
Sublandlord for the Subpremises.  Sublandlord agrees to make a good faith effort
to get Geac to give Subtenant the right to use the Building's directory.

          15.  Notices.  All notices to be given hereunder shall be by
               -------
Registered or Certified Mail, Return Receipt Requested, or by hand delivery, or
via a nationally recognized overnight
<PAGE>

courier, at the respective addresses set forth above and shall be deemed given
three (3) days after depositing same in custody of the U.S. Postal Service, or
if delivered by hand or via overnight courier upon receipt of the same. Either
party may change the address to which notices shall be sent by notice similarly
given to the other party. Notices to Subtenant shall also be sent to:

               Interliant, Inc.
               2 Manhattanville Road
               Purchase, NY 10577
               Attn.: General Counsel

          16.  Entire Agreement.  This Sublease contains the entire agreement
               ----------------
between the parties and this agreement shall be binding upon and inure to the
benefit of the parties hereto and their respective successors and permitted
assigns.

          17.  Jurisdiction.  Except as otherwise set forth in this Sublease,
               ------------
any disputes between the parties shall be adjudicated in accordance with the
laws of the State of Georgia.

          18.  Conflicts.  In the event that any provision contained within this
               ---------
Sublease shall conflict with any provision set forth in the Overlease, the Full
64 Sublease and the Prime Lease, the provisions set forth in this Sublease shall
prevail.

          19.  Inspections.  Sublandlord, its agents or employees, may enter the
               -----------
Subpremises at reasonable hours, upon reasonable notice (except in an emergency,
for which no notice shall be required) provided that Sublandlord shall endeavor
to conduct any such entry in such a manner as to not unreasonably disrupt or
interrupt Subtenant's operations in the Subpremises.

          20.  Subordination.  This Sublease shall be subject and subordinate to
               -------------
the Prime Lease, the Full 64 Lease and the Overlease and to any underlying land
leases or deeds to secure debt which may now or hereafter affect this Sublease,
the Building, or the property upon which the Building sits and also to all
renewals, modifications, extensions, consolidations, and replacements of such
underlying land leases and such deeds to secure debt; provided, however,
<PAGE>

the holder of any such present or future land lease or deed to secure debt,
shall agree not to disturb Subtenant as long as Subtenant is not in default
hereunder. Subtenant agrees to execute and deliver such instruments as may be
desired by the holder of a deed to secure debt or by any lessor under any such
underlying land lease. Notwithstanding the foregoing, Sublandlord or any holder
of a deed to secure debt shall have the right to subordinate, in whole or in
part, any such underlying land leases or deeds to secure debt to this Sublease
(but not in respect to priority of entitlement of insurance or condemnation
proceeds). Notwithstanding anything to the contrary set forth in this Sublease,
Subtenant, upon paying the Fixed Rent and all Additional Rent and other charges
herein provided for and performing all covenants and conditions of this
Sublease, on its part to be performed, shall quietly have and enjoy the
Subpremises during the term of this Sublease, without hindrance or molestation
by Sublandlord or any other person claiming through Sublandlord, including, but
not limited to Head Tenant and Geac.

          21.  Taxes on Subtenant's Property.  Subtenant shall be liable for all
               -----------------------------
taxes levied or assessed against personal property, furniture or fixtures placed
by Subtenant in the Subpremises.  If any such taxes for which Subtenant is
liable are levied or assessed against Sublandlord or Sublandlord's property and
if Sublandlord elects to pay the same, after notice to Subtenant, or if the
assessed value of Sublandlord's property is increased as a result of inclusion
of Subtenant's property, and Sublandlord elects to pay the taxes based on such
increase, Subtenant shall pay to Sublandlord upon demand and evidence of payment
that part of such taxes for which Subtenant is primarily liable hereunder.

          22.  Mechanic's Lien.  In the case of a filing of a mechanic's lien
               ---------------
upon the Subpremises, the Building or any improvements thereon during the term
of the Sublease caused by or resulting from any work performed, materials
furnished or obligation incurred by or at the
<PAGE>

request of Subtenant, Subtenant will promptly pay or discharge the same of
record. If default in payment or discharge thereof, or failure to post bond,
shall continue for thirty (30) days after notice thereto from Sublandlord to
Subtenant, Sublandlord shall have the right and privilege at Sublandlord's
option, in addition to and not in lieu of any other remedies available to
Sublandlord hereunder, of bonding off said lien. In such event, any amounts so
paid, including expenses and interest, shall be treated as additional rent
hereunder and shall be paid with the next rent payment due hereunder.

          23.  Estoppel Certificates.  Either party may request ("Requesting
               ---------------------
Party") from time to time from the other party ("Other Party") a certificate
signed by the Other Party confirming and containing the following factual
certifications: (i) the Sublease is unmodified and in full force and effect (or
if there shall have been modifications that this Sublease is in full force and
effect as modified, and stating such modifications); (ii) the dates to which all
rental and other charges have been paid and whether any such payment represents
payment in advance; and (iii) to the best knowledge of the Other Party, no
default of the Requesting Party in the performance of any covenant, agreement or
condition has occurred and remains uncured or, has been waived or, if a default
has occurred, the steps being taken, if any, to cure or correct the same, and
the Other Party shall, within fifteen (15) days following receipt of said
proposed certification from the Requesting Party, return a fully executed copy
of said certificate to the Requesting Party.

          24.  Other Charges.  If Subtenant shall procure any additional
               -------------
services for the Subpremises, or if Sublandlord shall procure additional
services for the Swap Space, such as alterations or after-hours air
conditioning, the party requesting such services shall pay for same at the rates
charged to Sublandlord or Subtenant, as the case may be, for such services and
shall make such payments to such parties as Sublandlord or Subtenant, as the
case may be, shall direct.
<PAGE>

Any such sums payable by a party hereunder shall be Additional Rent and
collectible as such. Subtenant shall be solely responsible for the establishment
of and payment for telephone and other communications services for the
Subpremises during the term of this Sublease. Sublandlord shall be responsible
for the establishment of additional payment for telephone and other
communication services for the Swap Space during Sublandlord's period of
occupancy.

          25.  Attorneys' Fees.  If any law suit or court action between
               ---------------
Sublandlord and Subtenant arises out of or under this Sublease, the prevailing
party in law suit or court action shall be entitled to and shall collect from
the non-prevailing party the reasonable attorneys' fees and court costs actually
incurred by the prevailing party with respect to said lawsuit or court action.

          26.  Time of the Essence.  TIME IS OF THE ESSENCE OF THIS SUBLEASE.
               -------------------

          27.  No Estate in Land.  Subtenant has only a usufruct under this
               -----------------
Sublease, not subject to levy or sale. No estate shall pass out
of Sublandlord by this Sublease.

          28.  Services.  Except as otherwise provided hereunder, the only
               --------
services or rights to which Subtenant is entitled hereunder are those to which
Sublandlord is entitled to as subtenant under the Overlease.  For all such
services, Subtenant shall look to Geac under the Overlease or Head Tenant under
the Full 64 Sublease, as applicable.  Sublandlord shall promptly cooperate with
Subtenant in obtaining said services from Geac and/or Head Tenant.

          29.  No Acts.  Neither party shall do nor permit anything to be done
               -------
which would cause the Prime Lease, the Full 64 Lease or the Overlease to be
terminated or forfeited or any claims to accrue to the benefit of the Owner,
Head Tenant or Geac, respectively, by reason of any right of termination or
forfeiture reserved or vested in such entities, or any rights to damages
accruing to or for the benefit of such parties, and each party shall indemnify,
agree to defend and
<PAGE>

hold the other party harmless from and against all loss, cost, damage or
expense, including, but not limited to, reasonable attorneys' fees actually
incurred, of such party by reason of any default on the part of the other party
by reason of which the Prime Lease, Full 64 Lease or Overlease may be terminated
or forfeited, or any claims shall accrue to the benefit or for the benefit of
Owner, Head Tenant or Geac.

          30.  No Recordation.  With the prior consent of Sublandlord, neither
               --------------
this Sublease nor any memorandum hereof shall be recorded or placed on public
record.

          31.  Hazardous Wastes.  Subtenant agrees to comply with the
               ----------------
requirements respecting Hazardous Materials as set forth in the Full 64 Lease
with respect to the Subpremises and Subtenant's use and occupancy thereof.  In
addition, Subtenant agrees to indemnify, defend and hold Sublandlord harmless
from and against all loss, cost, damage or expense, including, but not limited
to, reasonable attorneys' fees actually incurred, from Subtenant's breach of
such provisions.  Sublandlord represents and warrants that as of the date of
this Sublease, it is in full compliance with all requirements respecting
Hazardous Materials as set forth in the Full 64 Lease with respect to the
Subpremises.

          32.  Casualty and Eminent Domain.  The effect of a partial or total
               ---------------------------
destruction of the Building or Subpremises by fire or other casualty and the
effect of taking of all or part of the Building or Subpremises for any public or
quasi-public use by virtue of the exercise of the power of eminent domain, or by
private purchase in lieu thereof, shall be governed by the Full 64 Sublease.
Without limiting the generality of the foregoing, in the event that the Full 64
Sublease is terminated pursuant to the provisions of the Full 64 Sublease
relating to casualty or eminent domain, this Sublease shall terminate
contemporaneously therewith.
<PAGE>

          33.  Consents.  This Sublease is expressly contingent upon the consent
               --------
by the Head Tenant and Geac to this Sublease in accordance with the Overlease.

          IN WITNESS WHEREOF, Sublandlord and Subtenant have executed this
Sublease  as of the date first above written.

SUBTENANT                                        SUBLANDLORD
---------                                        -----------

INTERLIANT, INC.                                 PHILIPS ELECTRONICS NORTH
                                                 AMERICA CORPORATION

By:  /s/ Kristian Nelson                         By:  /s/ Gary T. Pearson
     -------------------                              -------------------

Name:   Kristian Nelson                          Name:  Gary T. Pearson
Title:  Sr. VP of Operations                     Title: Sr. Vice-President
Witness:  /s/ Tamara L. Barker                   Witness:  /s/ Thomas M. Hafner
          --------------------                             --------------------
Name:     Tamara L. Barker                       Name:      Thomas M. Hafner

Consented to this 1/st/day of May, 2000 by Geac Computer Systems, Inc.

By:    /s/ Robin deMercado
       -------------------
Name:  Mr. Robin deMercado
Title: Director, Corporate Services
       And Administration<PAGE>

                                                                   EXHIBIT 10.52

THE FELD
 GROUP
--------------------------------------------------------------------------------

August 10, 2000

Mr. Herb Hribar
Chief Executive Officer and President
Interliant, Inc.
Two Manhattanville Road
Purchase, NY 10577-2118
Phone 914.640.9000
Fax 914.694.1190

Re: COO Services

Dear Herb,

This letter outlines the understanding between The Feld Group, Inc, a Delaware
corporation ("TFG"), and Interliant, Inc. ("INIT" or the "Company"), of the
objective, tasks, work product and compensation for the engagement of TFG to
provide Information consulting services to the Company and of the terms of the
strategic alliance between TFG and the Company.

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                                   OBJECTIVE
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     .    To act as the Chief Operating Officer for the Company.
     .    To  establish a strategic alliance between TFG and the Company.

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                             TASKS AND WORK PRODUCT
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Tasks

     .    Advise the Company's Senior Management and provide a leadership role
          or roles in the day-to-day operations of the Company and its
          subsidiaries.

     .    Perform such other tasks as may be mutually agreed upon and that are
          within our expertise.

     .    To help define, architect, and select technology partners that will
          help enable the Company and its affiliates to build its technology
          infrastructure.

     .    To perform such other tasks as are reasonably requested by the CEO of
          the Company and which are consistent with the role of a COO of a
          company similar to the Company.

     .    Personal attendance at both internal and external meetings concerning
          the Company as may be requested by the CEO, and visitation to Company
          or customer sites as may be required to appropriately perform the
          tasks of the COO of the Company.

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Work Products

     .    Information to be discussed with you and others, as you may direct.

     .    Written reports and analytical worksheets to support our suggestions
          asyou may reasonably request.

     .    Provide COO related operational management as appropriate.

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                                   STAFFING
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Bruce Graham will be assigned to the position of the Chief Operating Officer
reporting to the CEO and President. For planning purposes, to fulfill the
responsibilities of Chief Operating Officer, we expect Bruce to be assisted by
1.5 additional Feld Group consultants at various levels, all of whom have a wide
range of skills and abilities related to this type of assignment. In addition,
we have relationships with, and may retain, independent contractors with
specialized skills and abilities to assist us. These independent contractors
shall be billed to Interliant directly. Any such engagement of independent
contractors or consultants shall be subject to the prior approval of the CEO of
the Company.

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                           TIMING, FEES AND EXPENSES
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Monthly Fees: We will commence this agreement as of August 7, 2000 and end on
July 31, 2001.

We will bill the Company at the rate of $130,000.00 a month for services,
prorated for any portion of a month that is less than a complete calendar month.
For purposes of monthly billings, we will bill our fees monthly in advance and
will expect to be paid by the 20th of each month. We are also reimbursed for
directly related costs, such as travel, hotel, and production support, which
costs shall be payable to TFG in accordance with an expense budget (estimated at
10-15% of total professional fees) to be mutually determined by TFG and the CEO
of the Company. Unless not practical or not cost efficient in a particular
instance, TFG will use the Company's travel services.

In addition, we will receive a grant of warrants to purchase common stock of the
Company, in total, equal to 180,000 shares at current fair market value of no
more than $13.06 each, subject to the termination provisions below.

From time to time, subject to the Company's prior approval in each instance, we
may deploy additional resources above our planned staffing levels into the
Company. We will bill in arrears for any such additional resources at a monthly
rate of $83,000.00 for a full-time consultant.

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                          RELATIONSHIP OF THE PARTIES
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The parties intend that an independent contractor relationship will be created
by this agreement. The employees of TFG are not entitled to any of the benefits
that the Company provides for the Company's Employees such as, but not limited
to, vacation payment, retirement, health care or sick pay. Company shall not be
responsible for withholding income or other taxes from the payments made to TFG.
TFG shall be solely responsible for filing all returns and paying any income,
social security or other tax levied upon or determined with respect to the
payments made to TFG pursuant to this Agreement. As and if required by the laws
of the states in which it operates, TFG shall provide workers compensation
insurance and upon request provide to the Company a certificate of such
coverage.

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<PAGE>

The Company and TFG each agree not to solicit, recruit or hire any employees or
agents of the other for a period of one year subsequent to the completion and/or
termination of this agreement.

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                                CONFIDENTIALITY
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TFG agrees to keep confidential all proprietary information obtained from or
created on behalf of the Company or its subsidiaries. TFG agrees that neither it
nor its directors, officers, principals, employees, consultants, agents or
attorneys will disclose to any other person or entity, or use for any purpose
other than specified herein, any information pertaining to the Company or any
affiliate thereof which is either non-public, confidential or proprietary in
nature ("Information") that it obtains or is given access to during the
performance of the services provided hereunder. TFG may make reasonable
disclosures of Information to third parties in connection with their performance
of their obligations and assignments hereunder on a "need to know" basis and
upon prior notice to Company's General Counsel; however, TFG shall not disclose
the Company's or its subsidiaries' business plans and forecasts to any party
that has not signed a confidentiality agreement nor any Information to any third
party from whom the Company has requested a signed confidentiality agreement,
until the Company receives such agreement. In addition, TFG will have the right
to disclose to others in the normal course of business its involvement with the
Company.

Information includes, but is not limited to, data, plans, reports, schedules,
drawings, accounts, records, calculations, specifications, flow sheets, computer
programs, source or Object codes, results, models, or any work product relating
to the business of the Company, its subsidiaries, distributors, affiliates,
vendors, customers, employees, contractors and consultants, and any other
material marked "confidential" by the Company.

The Company acknowledges that all advice (written or oral) given by TFG to the
Company in connection with TFG's engagement is intended solely for the benefit
and use of the Company and its affiliates (limited to its management and
employees) in considering the transactions to which it relates. The Company
agrees that no such advice shall be used for any other purpose or reproduced,
disseminated, quoted or referred to at any time in any manner or for any purpose
other than accomplishing the tasks and programs referred to herein or in
discussions with the Company's professional advisors, lenders or debt holders,
without TFG's prior approval (which shall not be unreasonably withheld,
conditioned or delayed) except as required by law. The confidentiality
obligations of both parties under this agreement will survive the termination of
the engagement. During the engagement, TFG shall provide the Company access to
all information or work product developed by or on behalf of TFG relating to the
Company or its subsidiaries and the engagement.

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                            STRATEGIC RELATIONSHIP
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During the term of this agreement, TFG and the Company shall establish a
meaningful strategic relationship which shall include, without limitation, the
following:

 .    TFG shall outsource to the Company, all of its internal web and application
     hosting and IT solution and professional service needs related thereto,
     provided the Company offers such services and its pricing is market
     competitive.

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<PAGE>

 .    The Company shall be TFG's exclusive web hosting and application service
     provider ("ASP") partner for referrals or recommendations of such web
     hosting or ASP business to other companies or organizations with whom TFG
     is associated or performing services for. It is understood that
     notwithstanding the foregoing, TFG shall not have an obligation to refer
     such business to the Company in situations where TFG clients have
     established pre-existing relationships with other such providers.

 .    The Company shall be TFG's preferred partner for referrals or
     recommendations of IT consulting and professional services business to
     other companies with whom TFG is associated or performing services for.

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                                INDEMNIFICATION
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For purposes of indemnification, Bruce Graham shall be deemed an officer of the
Company and shall, along with other TFG personnel who may serve as officers of
the Company, be individually covered by the same indemnification and officers'
liability insurance as is applicable to other officers of the Company.

In engagements where a TFG employee is acting as an officer of the Company, it
is our practice to receive indemnification. Accordingly, in consideration of our
agreement to act on behalf of the Company in connection with this engagement,
the Company agrees to indemnify, hold harmless, and defend TFG (including its
principals, employees and agents) from and against all claims, liabilities,
losses, damages and reasonable expenses as they are incurred, including
reasonable legal fees and disbursements of counsel, relating to or arising out
of the engagement, including any legal proceeding in which we may be required or
agree to participate but in which we are not a party (collectively "Claims").
TFG's principals, its employees, agents and TFG may, but are not required to,
engage a single firm of separate counsel of our choice in connection with any of
the matters to which this indemnification agreement relates. This
indemnification agreement does not apply to actions taken or omitted to be taken
by TFG, its principals, employees or agents which constitute negligence or
willful misconduct.

TFG shall similarly indemnify and hold harmless the Company, its affiliates, and
their respective officers, directors, shareholders and employees from any Claims
caused by the negligence or willful misconduct of TFG, its principals, employees
or agents.

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                            TERMINATION AND SURVIVAL
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The agreement may be terminated upon thirty (30) days' written notice at any
time given by one party to the other; provided, however, that notwithstanding
such termination TFG will be entitled to any fees, and expenses due under the
provisions of the agreement that otherwise would be payable to TFG through the
last day of the calendar month within which the termination date falls pursuant
to such notice ("Early Termination Date"). Unless terminated as provided above,
this agreement will terminate on July 31, 2001 ("Termination Date"). In the
event of such early termination, a number of warrants equal to the product of
15,000 and the number of calendar months between the Early Termination Date and
the Termination Date shall be automatically forfeited by TFG.

The obligations of the parties under the Indemnification, Confidentiality and
Termination and Survival sections of this agreement shall survive the
termination of the agreement as well as the other sections of this agreement,
which expressly provide that they shall survive termination of this agreement.

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                                 GOVERNING LAW
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                                                                     Page 4 of 6
<PAGE>

This letter agreement is governed by and construed in accordance with the laws
of the State of Texas with respect to contracts made and to be performed
entirely therein and without regard to choice of law or principles thereof.

If we have a dispute with respect to any of the provisions of this agreement and
are unable to agree on a mutually satisfactory resolution within 30 days, either
party may require the matter to be settled by binding arbitration. If such
arbitration shall occur, it shall be in the city of Dallas if brought by the
Company and the City and County of New York if brought by TFG. We shall attempt
for two weeks to agree on a single arbitrator. If that effort shall fail, each
party shall appoint one arbitrator. The two arbitrators so chosen shall attempt
for two weeks to select a third. If they are unable to agree, the American
Arbitration Association in New York City shall choose the third. The arbitration
shall occur using the rules and procedures of the American Arbitration
Association. The decision of the arbitrator(s) shall be final, binding and non-
appealable. The arbitrator shall have the right to allocate costs and expenses
of the arbitration proceeding among TFG and the Company based on who the
prevailing party is.

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                                  DISCLOSURES
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We know of no fact or situation, which would represent a conflict of interest
for us with regard to this engagement. We do wish to disclose the following
information:

While we are not currently aware of any other relationships that connect us to
any party in interest, because TFG is a consulting firm that serves clients on a
national basis in numerous engagements, it is possible that TFG may have
rendered services to or have business associations with other entities which had
or have relationships with the Company, including creditors, vendors, and
customers of the Company. TFG has not and will not represent the interests of
any of these aforementioned entities in this engagement, involving the Company.
During the term of this agreement, the employees and consultants of TFG who are
staffing this engagement, including without limitation Bruce Graham, shall not
render services to any companies which are in businesses in competition with the
businesses in which the Company is engaged.

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                                 SEVERABILITY
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The failure of either party to enforce any portion of this agreement shall not
be construed as a waiver or limitation of that party's right to subsequently
enforce and compel strict compliance with every provision of this agreement.

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                               ENTIRE AGREEMENT
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All of the above contains the entire understanding of the parties relating to
the services to be rendered by TFG and may not be amended or modified in any
respect except in writing signed by the parties. TFG will not be responsible for
performing any services not specifically described in this letter or in a
subsequent writing signed by the parties. This agreement supercedes any prior
written or oral agreement between the parties. This agreement may not be
modified except in a writing signed by both parties.

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                            SUCCESSORS AND ASSIGNS
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This agreement is personal in its nature and neither of the parties hereto
shall, without the consent of the other, assign or transfer this agreement or
any rights or obligations hereunder, except that the Company may assign this
agreement to any of its subsidiaries or to any successor entity resulting from a
merger, consolidation, sale of stock of the Company or sale of

                                                                     Page 5 of 6
<PAGE>

                                                                        Ex.10.52

substantially all of the assets of the Company. The rights, privileges and
obligations of the parties hereto shall inure to the benefit of their respective
permitted successors and assigns.

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                                    NOTICES
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All notices required or permitted to be delivered under this letter agreement
shall be sent, if to us, to the address set forth at the head of this letter, to
the attention of Mr. Michael R. Koehler, and if to you, to the address for you
set forth above, to the attention of your General Counsel, or to such other name
or address as may be given in writing to the other party. All notices under the
agreement shall be sufficient if delivered by facsimile or overnight mail. Any
notice shall be deemed to be given only upon actual receipt. Any faxes to the
Company shall be sent to 914-694-4961 and to TFG shall be sent to 972-791-3951.

If these terms meet with your approval, please sign and return the enclosed copy
of this letter.

Sincerely yours,

The Feld Group

/s/ Mike Koehler

Mike Koehler
Chief Operating Officer

Acknowledged and Agreed to:

Interliant, Inc.

/s/ Herbert R. Hribar
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Herbert  R. Hribar,
Chief Executive Officer and President

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