<PAGE>   1
                                                                   Exhibit 10.14

LEASE AMENDMENT

      THIS LEASE AMENDMENT is made this                                   day
of                               1998, by and between VICTOR J. MAGGITTI, JR.
("LESSOR") and DECISIONONE CORPORATION  ("LESSEE") against the following
background.

                                   BACKGROUND

      On or about October, 1994, LESSOR leased to General Diagnostics, Inc.
approximately 45,000 square feet of space in the Maggitti Building located at
400 Devon Park Drive, Wayne, Pennsylvania through December 31, 1999.

      Subsequent thereto, LESSEE,  through a Lease Assignment and Assumption
Agreement with General Diagnostics, Inc. dated March 3, 1998,  assumed the
rights and obligations of General Diagnostics, Inc. under said Lease.

      A clause within said Lease allows LESSEE a Right of Renewal for an
additional five year period with fixed rental rates upon the Lease termination
date of December 31, 1999.

      LESSEE has proposed a reconfiguration of their existing space while
extending the term of the Lease through the aforementioned renewal period.

      NOW THEREFORE, in order to amend that certain Lease Agreement dated
October, 1994 as amended ("LEASE") and intending to be legally bound hereby, the
parties hereto agree as follows:

1     The term of the LEASE, is hereby amended to be for a term of seven years
      and four months commencing September 1, 1998 and ending December 31, 2005.
<PAGE>   2
2     LESSOR and LESSEE hereby confirm and agree that the rentable area of the
      Demised Premises equals 45,000 square feet as marked on the drawing
      attached as SCHEDULE "A" hereto and incorporated herein by reference.
      LESSOR and LESSEE hereby further confirm and agree that the rentable area
      of the Maggitti Building of which the Demised Premises are a part equals
      130,998 square feet.

3     From and after September 1, 1998, LESSEE shall pay minimum annual rent as
      set forth on the Schedule of Rents attached hereto and marked SCHEDULE "B"
      and incorporated herein by reference. In addition, LESSEE shall pay, as
      additional rent, LESSEE'S proportionate share of the service charges
      incurred by LESSOR for the Maggitti Building, also based on 45,000 square
      feet or 34.35% of the total service charges for the building. For the
      months of October, November and December 1998, LESSOR agrees to abate the
      minimum rent by a total of $36,562.50 or $12,187.50 for each month. During
      the abatement period, LESSEE will continue to pay operating costs for the
      entire 45,000 square feet as set forth in SCHEDULE "B". Said operating
      costs shall contain an allowance for management of the premises which
      shall equal 5% of the "BASE RENTAL" for the Demised Premises.

4     LESSOR will provide up to $750,000.00 for a Leasehold Incentive Fund for
      the purposes hereinafter set forth in this Lease Amendment. The sums
      expended from the Leasehold Incentive Fund will be repaid to LESSOR in the
      form of additional rent payable in monthly installments as an additional
      part of the monthly rent in an amount equal to the sum necessary to
      amortize the entire Leasehold Incentive Fund over the entire LEASE term
      including interest at an annual rate of 9%.


                                       2
<PAGE>   3
5     LESSEE is currently entitled to use 70 parking spaces as part of their
      allotted parking ratio. LESSOR shall provide LESSEE full use of an
      additional 35 parking spaces which shall be so designated and reserved
      bringing the total parking spaces allotted to LESSEE to 105 spaces.

6     LESSOR will provide from the above described Leasehold Incentive Fund for
      any/all of the following costs which may be associated with the existing
      space including both hard and soft costs associated with construction and
      tenant finishes (tenant improvements) to existing space, including voice
      and data cabling, voice and data equipment, fixtures, moving, leasing
      commissions, project management, and the like. The following items shall
      be paid for from the Leasehold Incentive Fund but the total costs of such
      items shall be limited so that the maximum allowance (including sales
      taxes and delivery charges, if any) for all of these items shall be
      $365,000.00 which was arrived at using the amounts set forth below. Any
      excess costs above $365,000.00 for all of these items shall be paid by
      LESSEE.

<TABLE>
<S>                                                         <C>
            Allowance for Voice and Data Cable              $  35,000.00
            Allowance for Furniture                         $170,000.00
            Allowance for Telecom Equipment                 $  50,000.00
            Allowance for Security                          $  20,000.00
            Allowance for Commissions                       $  45,000.00
            Allowance for Moving                            $  20,000.00
            Allowance for Project Management                $  25,000.00
</TABLE>

      LESSEE, shall arrange the purchase of each of the above items and submit
      the final bills to LESSOR for payment.

      The remaining portion of the $750,000.00 Leasehold Incentive Fund or
      $385,000.00 shall be applied towards the total construction costs,
      estimated to be $625,000.00, necessary to "turnkey" the facility for
      business as presented in the plans and specifications hereafter


                                       3
<PAGE>   4
      described. The portion of the construction costs which exceeds the
      LESSEE'S portion of the construction allowance shall be the responsibility
      of the LESSOR, and not passed on to the LESSEE.

7     LESSEE has provided plans and specifications covering the desired
      modifications to the premises to be funded from the Leasehold Incentive
      Fund. Said plans and specifications have been approved by the parties and
      are incorporated herein by reference as if they were set forth herein at
      length.

8     LESSOR shall provide for the construction and improvements to the demised
      premises in accordance with said plans and specifications. LESSOR shall
      use his best efforts to complete said construction and improvements within
      sixty (60) days from the date of execution of this Lease Amendment. LESSEE
      shall have the right to approve the selection of any and all contractors,
      subcontractors, architects or engineers associated with the construction
      or acquisition of improvements to be paid from the Leasehold Incentive
      Fund. LESSEE's approval shall not be unreasonably withheld. Any delays
      caused by this approval process shall be added to the aforesaid sixty (60)
      day period.

9     LESSOR agrees that if at any time during the term of the LEASE, as
      amended, LESSOR wishes to lease all or any portion of the space not
      occupied by LESSEE within the Maggitti Building but contiguous to the
      Demised Premises to third party tenants (other than tenants presently in
      the Maggitti Building), then LESSOR shall offer in writing ("OFFER") to
      lease such space to LESSEE which OFFER shall identify the portion of the
      Maggitti Building subject to the OFFER ("OFFERED SPACE") and the date on
      which the OFFERED SPACE will become available. If any space in the
      Maggitti Building is currently subject to existing

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<PAGE>   5
      options or rights of first refusal, this present right shall accrue only
      after the lapse of such pre-existing option or right. After delivery of an
      OFFER, LESSEE shall have ten business days to respond to such OFFER. Rent
      and other terms and conditions for LESSEE's leasing of the OFFERED SPACE
      shall be the same rent and the same terms and conditions as then
      applicable to the Demised Premises under the LEASE, as amended. If LESSEE
      shall accept the OFFER, the OFFERED SPACE shall become part of the Demised
      Premises at the same rate and upon the same terms and conditions as then
      applicable to the remainder of the Demised Premises under the LEASE, as
      amended. If LESSEE shall reject the offer, or shall fail to accept it in
      writing within ten business days after the receipt thereof, then LESSOR
      shall be free to lease the OFFERED SPACE to third parties free and clear
      of LESSEE's option and rights under this Paragraph 12. The fact that
      LESSEE rejects an offer or fails to accept it in a timely fashion shall
      have no affect on LESSEE's ongoing right of first offer for any
      subsequently available space in the Maggitti Building which is contiguous
      to the Demised Premises.

10    LESSEE agrees that simultaneously with the execution of this LEASE
      AMENDMENT, it will execute and deliver to LESSOR a "SUBORDINATION,
      NON-DISTURBANCE AND ATTORNMENT AGREEMENT" and "LESSEE'S ESTOPPEL
      CERTIFICATE" in the form attached hereto and marked SCHEDULE "C".

11    The terms and conditions set forth on the attached and marked up "RIDER
      TO LEASE BETWEEN DECISIONONE CORPORATION AND VICTOR J. MAGGITTI, JR. DATED
      - September 1998" (marked "SCHEDULE D") are hereby incorporated herein by
      reference as fully as if they were expressly set forth at length.


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<PAGE>   6
12    LESSEE is hereby given the option to extend the term of this Lease for an
      additional term of five (5) years (RENEWAL TERM) upon the same terms and
      conditions as set forth in this Lease, except for the adjustment for
      "ADDITIONAL RENTAL" set forth on SCHEDULE B. LESSEE agrees to give LESSOR
      written notice of election to exercise this option not less than six
      months prior to the expiration of the then current term hereof. If the
      LESSEE exercises its option to so renew the Term, then the annual rent for
      the RENEWAL TERM shall be as set forth on the Remittance Schedule attached
      hereto as SCHEDULE B for the years set forth thereon.

13    Except as modified hereby, all other terms and conditions of the LEASE, as
      amended, shall continue in full force and effect.

      IN WITNESS WHEREOF, the parties have hereunto set their hands and seals
the day and the year first above written.

WITNESS:__________________________          _____________________________(SEAL)
                                               VICTOR J. MAGGITTI, JR.

                                                DECISIONONE CORPORATION

ATTEST:___________________________          BY:__________________________(SEAL)
         Name:                                     Name:
         Title:                                    Title:


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<PAGE>   7
                                   SCHEDULE A

                                   DRAWING OF
                                DEMISED PREMISES
                                       FOR
                             DECISIONONE CORPORATION
<PAGE>   8
                                   SCHEDULE C

                         SUBORDINATION, NON-DISTURBANCE
                                       AND
                              ATTORNMENT AGREEMENT

                          LESSEE'S ESTOPPEL CERTIFICATE
<PAGE>   9
                                   SCHEDULE D

                                 RIDER TO LEASE
                                     BETWEEN
                             DECISIONONE CORPORATION
                                       AND
                             VICTOR J. MAGGITTI, JR.
                             DATED - September 1998
<PAGE>   10
                                 LEASE AMENDMENT

      THIS LEASE AMENDMENT is made this                                   day
of May, 1999, by and between VICTOR J. MAGGITTI, JR. ("LESSOR") and
DECISIONONE CORPORATION  ("LESSEE") against the following background.

                                   BACKGROUND

      On or about October, 1994, LESSOR leased to General Diagnostics, Inc.
approximately 45,000 square feet of space in the Maggitti Building located at
400 Devon Park Drive, Wayne, Pennsylvania through December 31, 1999.

      Subsequent thereto, LESSEE,  through a Lease Assignment and Assumption
Agreement with General Diagnostics, Inc. dated March 3, 1998,  assumed the
rights and obligations of General Diagnostics, Inc. under said Lease.

      A clause within said Lease allows LESSEE a Right of Renewal for an
additional five year period with fixed rental rates upon the Lease termination
date of December 31, 1999.

      On or about September 25, 1998, the parties reconfigured the leased space
while extending the term of the Lease to December 31, 2005.

      The LESSEE has now requested additional space in the building and certain
renovations to the new and existing leased space and the LESSOR has agreed to
amend the Lease.

      NOW THEREFORE, in order to amend that certain Lease Agreement dated
October, 1994 as amended ("LEASE") and intending to be legally bound hereby, the
parties hereto agree as follows:
<PAGE>   11
1     Beginning July 1, 1999 and extending through December 31, 2005, LESSOR
      will lease to LESSEE an additional fifty-four hundred (5,400) square feet
      of space in the Maggitti Building and LESSOR and LESSEE hereby confirm and
      agree that the rentable area of the Demised Premises now equals 50,400
      square feet as marked on the drawing attached hereto as "EXHIBIT 99-A" and
      incorporated herein by reference. LESSOR and LESSEE hereby further confirm
      and agree that the rentable area of the Maggitti Building of which the
      Demised Premises are a part equals 130,998 square feet.

2     From and after July 1, 1999, LESSEE shall pay minimum annual rent as set
      forth on the Schedule of Rents attached hereto and marked "EXHIBIT 99-B"
      and incorporated herein by reference. In addition, LESSEE shall pay, as
      additional rent, LESSEE'S proportionate share of the service charges
      incurred by LESSOR for the Maggitti Building, also based on 50,400 square
      feet or 38.474% of the total service charges for the building. Said
      operating costs shall contain an allowance for management of the premises
      which shall equal 6% of the "BASE RENTAL" for the Demised Premises.

3     LESSOR will make the necessary renovations called for in the plans and
      specifications quoted upon by Veneesa Construction Co., Inc. by written
      quote dated May 5, 1999, a copy of which is attached hereto as "EXHIBIT
      99-C". The sums expended by LESSOR will be repaid to LESSOR in the form of
      additional rent payable in monthly installments as an additional part of
      the monthly rent as set forth on EXHIBIT 99-B.

4     LESSEE is currently entitled to use 105 parking spaces as part of their
      allotted parking ratio. LESSOR shall provide LESSEE full use of an
      additional 15 parking spaces including 4

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<PAGE>   12
      handicapped spaces which shall be so designated and reserved bringing the
      total parking spaces allotted to LESSEE to 120 spaces.



5     In addition to the "fit out" costs referred to above, LESSOR will provide
      LESSEE allowances for any/all of the following costs which may be
      associated with either the new space or the existing space including both
      hard and soft costs associated with construction and tenant finishes
      (tenant improvements) to existing space. These additional costs or
      allowances which LESSOR shall provide shall include voice and data
      cabling, voice and data equipment, fixtures, moving, leasing commissions,
      project management, and the like to a maximum cost of $150,000.00. LESSEE,
      shall arrange the purchase of each of the above items and submit the final
      bills to LESSOR for payment. It is not contemplated that the construction
      cost shall exceed the above described quotation. The cost of any change
      orders to the construction "fit-out" agreed to herein which are requested
      after the date of this Amendment shall be the responsibility of LESSEE.

6     LESSEE has provided plans and specifications covering the desired
      modifications to the premises to be funded by LESSOR. Said plans and
      specifications have been approved by the parties and are incorporated
      herein by reference as if they were set forth herein at length.

7     LESSOR shall provide for the construction and improvements to the demised
      premises in accordance with said plans and specifications. LESSOR shall
      use his best efforts to complete said construction and improvements within
      sixty (60) days from the date of execution of this Lease Amendment. If
      construction is not complete by July 1, 1999, the rental schedule set
      forth herein shall never-the-less be paid.


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<PAGE>   13
8     LESSEE agrees that simultaneously with the execution of this LEASE
      AMENDMENT, it will execute and deliver to LESSOR a "SUBORDINATION,
      NON-DISTURBANCE AND ATTORNMENT AGREEMENT" and "LESSEE'S ESTOPPEL
      CERTIFICATE" in the form attached hereto and marked "EXHIBIT 99-D".

9     LESSEE'S option, set forth in the previous Lease Amendment, to extend the
      term of this Lease for an additional term of five (5) years (RENEWAL TERM)
      upon the same terms and conditions as set forth in this Lease, except for
      the adjustment for "ADDITIONAL RENTAL" set forth on "EXHIBIT 99-B", is
      hereby extended to include the additional space. LESSEE agrees to give
      LESSOR written notice of election to exercise this option not less than
      six months prior to the expiration of the then current term hereof. If the
      LESSEE exercises its option to so renew the Term, then the annual rent for
      the RENEWAL TERM shall be as set forth on the Remittance Schedule attached
      hereto as "EXHIBIT 99-B" for the years set forth thereon.

10    Except as modified hereby, all other terms and conditions of the LEASE, as
      amended, shall continue in full force and effect.

      IN WITNESS WHEREOF, the parties have hereunto set their hands and seals
the day and the year first above written.

WITNESS:__________________________                    ____________________(SEAL)
                                                         VICTOR J. MAGGITTI, JR.

                                                         DECISIONONE CORPORATION


ATTEST:___________________________                   BY:__________________(SEAL)
          Name:                                           Name:

                                       4
<PAGE>   14
          Title:                                          Title:

                                       5
<PAGE>   15
                                  EXHIBIT 99-A

                                   DRAWING OF
                                DEMISED PREMISES
                                       FOR
                             DECISIONONE CORPORATION
<PAGE>   16
                                  EXHIBIT 99-D

                         SUBORDINATION, NON-DISTURBANCE
                                       AND
                              ATTORNMENT AGREEMENT

                          LESSEE'S ESTOPPEL CERTIFICATE