<PAGE>
                                                                   EXHIBIT 10.18


                               AMENDMENT TO LEASE

This Amendment to Lease is made this ___22nd__ day of September, 1998 by and
between 1720 Oak Street, L.L.C. a New Jersey limited liability company, having
an address c/o Sudler Management Company, 300 Interpace Parkway, Bldg C,
Parsippany, New Jersey 07054-1100, successor in interest to C.P. Lakewood, L.P.
("Landlord"), and Micro Warehouse, Inc., a Delaware corporation, having an
address at 29 Haviland Street, South Norwalk, Connecticut 06854 ("Tenant").

         WITNESSETH:

         WHEREAS, by Agreement of Lease dated February 25, 1992 (the "Lease"),
by and between Landlord and Tenant, Landlord leased to Tenant and Tenant leased
from Landlord the premises located at 1720 Oak Street, Lakewood, New Jersey
consisting of approximately 52,109 square feet of space ("Premises"); and

         WHEREAS, it is now the desire of Landlord and Tenant to amend and
extend said Lease as set forth herein;

         NOW, THEREFORE, in consideration of the mutual covenants herein
contained, Landlord and Tenant hereby agree that, effective as the date hereof
as set forth above, the Lease is amended as follows:

1.   Section 1(b) of the Lease is deleted and the following substituted in its
place and stead:

         "(b) NAME AND ADDRESS OF LANDLORD:

           1720 Oak Street, L.L.C.
           a New Jersey limited liability company
           c/o Sudler Management Company
           300 Interpace Parkway, Bldg C
           Parsippany, New Jersey  07054-1100"

2.   Section 1(h) of the Lease is deleted and the following substituted in its
place and stead:

         "(h) BROKER:

           Samson Realty Corp.; commission to be paid by Landlord."

3.       TERM: The term of the Lease is extended for a period of ten (10)
         additional years commencing on July 1, 1999 and terminating on June 30,
         2009 (the "Extension Term").

4.       Section 3 of the Lease is amended by deleting the second and third
         paragraphs thereof.

5.       RENT: The Fixed Rent payable by Tenant to Landlord during the Extension
         Term shall be as follows:

         Period                    Per Square Foot   Monthly         Annually
         ------                    ---------------   -------         --------

         Years 1 - 5                     $6.25      $27,140.10      $325,681.25
         of the Extension Term

         Years 6 - 10                    $7.19      $31,221.98      $374,663.71
         of the Extension Term


<PAGE>

6.       The first paragraph of Section 8 of the Lease shall be designated
         Section 8(a) and the following new sections 8(b) and 8(c) shall be
         added:

                  "(b) In the event that Tenant wishes to utilize services of an
                  alternative electricity service provider ("ASP") rather than
                  the public utility that is servicing the Building as of the
                  date of Tenant's execution of this Amendment, no such ASP
                  shall be permitted to provide service to Tenant or to install
                  its lines or other equipment with the Building without
                  obtaining the prior written consent of Landlord, not to be
                  unreasonably withheld.

                  (c) Unless all of the following conditions are satisfied to in
                  a written agreement between the ASP and Tenant or by any other
                  means acceptable to Landlord, it shall be reasonable for
                  Landlord to refuse its consent:

                           (i) Landlord shall incur no expense whatsoever with
                           respect to any aspect of ASP's provision of its
                           services, including without limitation, the cost of
                           installation, service and materials;

                           (ii) Prior to commencement of any work in or about
                           the Premises by ASP, ASP shall supply verification
                           that ASP is properly insured and financially capable
                           of covering any uninsured damage;

                           (iii) ASP shall agree in writing to abide by rules
                           and regulations, job site rules, and such other
                           requirements, imposed on reasonable notice, as
                           reasonably determined by Landlord, to be necessary to
                           protect Landlord's interest in the Premises;

                           (iv) Landlord reasonably determines that there is
                           sufficient space in the Building for the placement of
                           all of ASP's equipment and materials, including
                           without limitation, in the electricity risers;

                           (v) ASP is, licensed by applicable government
                           agencies, as shown in documents acceptable to
                           Landlord;

                           (vi) ASP agrees that Landlord shall have the right,
                           upon reasonable request, to supervise ASP's
                           performance of any work on or about the Premises,
                           including, without limitation, any installations or
                           repairs;

                           (vii) ASP agrees that Landlord shall have the right
                           to enter ASP's space at any time in the event of an
                           emergency and at all reasonble times and upon
                           reasonable notice for the purpose or inspecting same,
                           making repairs (though nothing herein shall be
                           construed to obligate Landlord to make any repairs),
                           or exhibiting the space for purposes of sale, lease,
                           or financing.

                  (d) Landlord's consent under this Section shall not be deemed
                  any kind of warranty or representation by Landlord, including
                  without limitation, as to the suitability or competence of
                  ASP.

                  (e) Tenant shall indemnify and hold harmless Landlord for all
                  losses, claims, demands, expenses, and judgments against
                  Landlord caused by or arising out of, either directly or
                  indirectly, any negligent or reckless acts or omissions by
                  ASP.

7.       Section 11 of the Lease is deleted in its entirety and the following
         substituted in its place and stead:


<PAGE>


         "11. MAINTENANCE AND REPAIRS. (a) Tenant shall keep and maintain the
         Property (including all non-structural, exterior, interior and
         landscaped areas, systems and equipment and the roof of the building)
         in good order, condition and repair during the Term, normal wear and
         tear excepted. Tenant shall promptly replace any portion of the
         Property or any systems or equipment thereof which cannot be fully
         repaired. All repairs and replacements shall be performed in a good and
         workmanlike manner. All of Tenant's obligations to maintain and repair
         the Property shall be accomplished at Tenant's sole expense.

                  (b) Tenant shall keep and maintain all portions of the
         Property and the parking areas, sidewalks and landscaped areas, in an
         attractive and clean condition free of dirt and rubbish, and clear the
         parking areas and sidewalks of accumulations of snow and ice.

                  (c) Landlord shall keep and maintain the structural portions
         of the building (except the roof) in good order, condition and repair,
         at Landlord's expense (except Tenant shall be responsible for any
         structural repairs and replacements necessitated by Tenant's negligence
         or Tenant's alterations to structural portion of building).

                  (d) During the Term, Tenant shall procure and maintain the
         following service contracts: (i) contract for inspection and
         maintenance of the roof of the Building (the inspections pursuant to
         such contract shall be made at least semi-annually); (ii) contract for
         the inspection, service, maintenance and repair of all heating,
         ventilating and air conditioning equipment installed in the Building
         (the inspection pursuant to such contract shall be made at least
         quarterly); (iii) contract for the inspection, maintenance and repair
         of sprinkler and fire protection systems, and (iv) contract for
         maintenance of the landscaped areas of the Property. The identity of
         each contractor and each contract shall be subject to Landlord's
         reasonable approval. Copies of reports of inspections made hereunder
         shall be promptly supplied to Landlord.."

8.       Sections 16(a) and 16(b) of the Lease shall be deleted in their
         entirety and the following substituted in their place and stead:

         "16. ENVIRONMENTAL LAW COMPLIANCE. (a) Tenant agrees that it shall, at
         its sole cost and expense, materially fulfill, observe and comply with
         all of the applicable terms and provisions of the Industrial Site
         Recovery Act, N.J.S.A 13:1K-6 ET SEQ., ("ISRA") the Spill Compensation
         and Control Act, N.J.S.A. 58:10-23.11 ET SEQ., (the "Spill Act"), and
         all other federal, state and local environmental laws now in effect or
         hereinafter enacted, as any of the same may be amended from time to
         time, and all rules, regulations, ordinances, opinions, orders and
         directives issued or promulgated pursuant thereto or in connection
         therewith. Tenant's obligations pursuant to this Section 16(a) shall
         apply to conditions relating to Tenant's operations and/or possession
         or use of the Property, and to conditions arising during Tenant's
         possession or use of the Property whether pursuant to this Lease or
         otherwise and whether caused directly or indirectly by Tenant or any
         other party on or off the Property. Landlord shall be responsible, at
         its sole cost and expense, for compliance with governmental
         requirements, if any, for cleanup or removal for any environmental
         contamination at the Property which pre-existed Tenant's initial
         occupancy of the Property which initial occupancy, the parties
         acknowledge, predates this Lease.

                  (b) Without limiting the foregoing, within the time period
         prescribed by applicable law with respect to "closing operations" or
         "transferring ownership or operations" (as said terms are defined in
         ISRA) by Tenant, Tenant, at its sole cost and expense, shall provide
         Landlord with a certified true copy of:


<PAGE>

                  (i) A letter from the New Jersey Department of Environmental
         Protection ("NJDEP") (or such other agency or body as shall then have
         jurisdiction over ISRA matters), stating that ISRA does not then apply
         to Tenant, Tenant's use and occupancy of the Property and the closing
         of operations or transferring of ownership or operations of all or any
         portion of the Property; or

                  (ii) A "No further action letter" (as said term is defined in
         ISRA) duly and finally approved by NJDEP or such other agency or body
         as shall then have jurisdiction over ISRA matters; or

                  (iii) A "Remedial action workplan" (as said term is defined in
         ISRA) duly and finally approved by NJDEP or such other agency or body
         as shall then have jurisdiction over ISRA matters, or

                  (iv) other documentation reasonably acceptable to Landlord
         evidencing Tenant's compliance with, or the non-applicability of, ISRA.

                  (c) In the event Tenant complies with Section 16(b), by
         obtaining an approved final Remedial action workplan, Tenant further
         agrees that it shall, at its sole cost and expense:

                  (i) Post or cause to be posted any financial guarantee or
         other bond required to secure implementation and completion of such
         Remedial action workplan, and

                  (ii) Promptly implement and prosecute to completion or cause
         to be so implemented and prosecuted such Remedial action workplan, in
         accordance with the schedules contained in said Remedial action
         workplan or as may be otherwise ordered or directed by NJDEP or such
         other agency or body as shall then have jurisdiction over such Remedial
         action workplan.

                  (d) Within twenty (20) days after written request by Landlord,
         Tenant, shall deliver to Landlord a duly executed and acknowledged
         affidavit of Tenant as Landlord may, from time to time, reasonably
         require, certifying:

                  (i) The proper four digit Standard Industrial Classification
         number relating to Tenant's then current use of the demised premises
         (said Standard Industrial Classification number to be obtained by
         reference to the then current Standard Industrial Classification Manual
         prepared and published by the Executive Office of the President, Office
         of Management and Budget or the successor to such publication); and

                  (ii) (A) That Tenant's then current use of the Property does
         not involve the generation, manufacture, refining, transportation,
         treatment, storage, handling, or disposal of hazardous substances(other
         than normal and customary office products and cleaning supplies used in
         Tenant's business in accordance with applicable environmental laws), or
         hazardous wastes, as hazardous substances and hazardous wastes are
         defined in ISRA, on site, above ground or below ground (all of the
         foregoing being hereinafter collectively referred to as the Presence of
         Hazardous Substances), or, (B) that Tenant's then present use does
         involve the Presence of Hazardous Substances, (other than normal and
         customary office products and cleaning supplies used in Tenant's
         business in accordance with applicable environmental laws) in which
         event, said affidavit shall describe in reasonable detail that portion
         of Tenant's operations which involves the Presence of Hazardous
         Substances. Tenant shall make available to Landlord, at reasonable
         times and upon Landlord's reasonable request, information which
         identifies each Hazardous Substance present at the Property, with the
         exception of ordinary office and/or cleaning supplies and products used
         in connection with the conduct of Tenant's business at the Premises.
         Tenant shall supply Landlord with such additional information relating
         to said Presence of Hazardous Substances as


<PAGE>

         Landlord may reasonably request.

                  (e)      Without limiting the foregoing, Tenant agrees,

                           (i) at its sole cost and expense, to promptly
         discharge and remove any lien or other encumbrance against the Property
         arising from or in connection with Tenant's failure or inability, for
         any reason whatsoever, to observe or comply with ISRA, all other
         environmental laws and the provisions of this Section 16; and

                           (ii) to indemnify and hold Landlord harmless from and
         against any and all liability, penalties, losses, expenses, damages,
         costs, claims, causes of action, judgments and/or the like, of whatever
         nature, including, but not limited to, reasonable attorneys' fees, to
         the extent said lien, encumbrance, liability, penalty, loss, expense,
         damage, cost, claim, cause of action, judgment and/or the like arise
         from or in connection with Tenant's failure or inability, for any
         reason whatsoever, to observe or comply with ISRA, all other
         environmental laws and the provisions of this Section 16.

                  (f) Tenant shall not, without the prior written consent of
         Landlord having been obtained, at any time during the term of this
         Lease, install any underground or above-ground tanks for the storage of
         fuel oil, gasoline and/or other petroleum products or by-products.

                  (g) In the event any portion of the Property is subleased or
         otherwise occupied by or through Tenant, Tenant shall be responsible
         for causing such parties to comply with the provisions of this Section
         16.

                  (h) Any cleanup of the Property required to be performed by
         Tenant hereunder shall be to the strictest standard regardless of use."

9.       Sections 16(c) and 16(d) of the Lease shall be renumbered as 16(i) and
         16(j), respectively.

10.      All references in the Lease to Sudler Construction Company shall be
         changed to Sudler Management Company, L.L.C., including but not limited
         to the references contained in Sections 7 and 25 of the Lease.

11.      Remaining Terms. Except as specifically amended and modified herein,
         all of the terms, covenants or conditions of the Lease shall remain in
         full force and effect.

         IN WITNESS WHEREOF, the parties hereby have duly executed this
Amendment to Lease as of the date first above set forth.

                                           LANDLORD:

                                           1720 Oak Street, L.L.C.

WITNESS:

                                            By: /s/ Peter Sudler
                                                --------------------------------
                                                Peter D. Sudler
                                                Its: Manager


                                            TENANT:

                                            MICRO WAREHOUSE, INC.

ATTEST:

                                            By: /s/ Bruce L. Lev
                                                --------------------------------
                                                Print Name: Bruce L. Lev
                                                Its: Executive Vice President