AMENDMENT NO. 8 TO CREDIT AGREEMENT AND WAIVERS

        AMENDMENT and WAIVERS dated as of July 19, 1999 among PERINI CORPORATION
(the "Borrower"),  the BANKS listed on the signature pages hereof (collectively,
the  "Banks")  and MORGAN  GUARANTY  TRUST  COMPANY  OF NEW YORK,  as Agent (the
"Agent").

                              W I T N E S S E T H :

        WHEREAS,  the Borrower,  the Banks and Morgan  Guaranty Trust Company of
New York,  as Agent,  are parties to an Amended and  Restated  Credit  Agreement
dated as of January 17, 1997 (as heretofore amended, the "Credit Agreement");

        WHEREAS,  the parties  have agreed to amend  certain  provisions  of the
Credit  Agreement  as provided  herein,  and at the request of the  Borrower the
Banks have agreed to grant the waivers provided herein;

         NOW, THEREFORE, the parties hereto agree as follows:

        SECTION 1. Definitions.  Unless otherwise  specifically  defined herein,
each term used herein  which is defined in the Credit  Agreement  shall have the
meaning  assigned  to such  term in the  Credit  Agreement.  Each  reference  to
"hereof",  "hereunder",  "herein" and "hereby" and each other similar  reference
and  each  reference  to  "this  Agreement"  and each  other  similar  reference
contained in the Credit  Agreement shall from and after the date hereof refer to
the Credit Agreement as amended hereby.

        SECTION 2. Amendment to Application of Mandatory Commitment  Reductions.
Section 2.10(b) of the Credit  Agreement is amended by deleting the reference to
"$5,000,000" in the proviso therein and inserting "$7,500,000" in lieu thereof.

        SECTION  3.   Amendment  to   Mandatory   Commitment   Reductions   from
Dispositions of Real Estate  Investments and Other Property.  Section 2.10(c) of
the Credit Agreement is amended as follows:

(a)      Clause (i) is amended and restated in its entirety to read as follows:

              "(i) immediately upon receipt by the Borrower or any Subsidiary at
         any time of any proceeds from any Disposition of any Real Estate

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                Exhibit  10.25  Investment  or any other  real  property  of the
                Borrower or any  Subsidiary  (including  without  limitation any
                proceeds   received  by  the  Borrower  or  any   Subsidiary  as
                consideration  for the granting of any right or option providing
                for a  Disposition  but excluding  operating  receipts from Real
                Estate  Investments),  by an  amount  equal  to  100% of the Net
                Proceeds  realized by the Borrower or any  Subsidiary in respect
                thereof."

(b)      Clause (ii) is amended by:

        (i)     deleting in subclause (C) thereof "80%" and inserting  "100%" in
                lieu thereof; and

        (ii)    deleting  the  phrase "at which  time the  Commitments  shall be
                reduced  by 80% of  $125,000  (i.e.,  $100,000)  or 80% of  such
                higher  integral  multiple of $125,000,  as the case may be" and
                inserting in its place the following phrase:

                "at which time the  Commitments  shall be reduced by $125,000 or
                such higher integral multiple of $125,000, as the case may be."

        SECTION 4.  Amendment  to Eliminate  Limitation  on Fees and Expenses of
Independent Public  Accountants,  Financial Advisors and Other Experts.  Section
9.03(a) of the Credit Agreement is amended by deleting the entire  parenthetical
containing the proviso in clause (i) thereof.

        SECTION 5. Bank Meeting.  The Borrower agrees to hold a meeting prior to
September 10, 1999, and that its Chairman, the chairman of the special committee
of  the  Borrower's  Board  of  Directors  appointed  to  consider   refinancing
alternatives,  the other  members of such  special  committee to the extent such
other  members  are  available  and  other  members  of  the  Borrower's  senior
management  will be present at the meeting,  to discuss the Borrower's cash flow
projections  for the remainder of 1999 and  2000-2002,  the status of the Rincon
Center project and a proposal for refinancing the Borrower's  obligations  under
the  Financing  Documents,  including  the proposed  capital  structure  for the
Borrower.  If requested  by any Bank prior to such  meeting,  the Borrower  will
ensure that any financial advisor retained by such special committee and Richard
C. Blum will be present at appropriate times during such meeting. Any failure by
the Borrower to comply with this Section 5 shall constitute an Event of Default.

        SECTION 6.  Waivers  With  Respect to the Rincon.  Solely for the period
from the date hereof through and including the "Rincon Waivers Termination Date"
(as defined  below),  each Bank waives the Defaults  (including  notice thereof)
arising under the Credit Agreement solely as a result of the fact that:

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                                                                   Exhibit 10.25

        (i)     the Rincon  Restructuring  shall not have become effective on or
                before April 30, 1999;

        (ii)    the Borrower's  shall have failed to comply with its obligations
                under  Section 5.02 of the Credit  Agreement,  but solely to the
                extent such  obligations  would  require  the  Borrower to cause
                Perini Land and Development and Rincon Center  Associates to pay
                and discharge,  at or before  maturity,  all of their respective
                material  obligations  and  liabilities  relating  to the Rincon
                Center project;

        (iii)   Rincon Center  Associates  shall have failed to make any payment
                in respect of Debt relating to the Rincon Center project; or

        (iv)    any  event  or  condition  shall  occur  which  results  in  the
                acceleration  of the  maturity  of any  Debt  of  Rincon  Center
                Associates relating to the Rincon Center project or enables (or,
                with the  giving  of  notice  or  lapse  of time or both,  would
                enable)  the  holder of such Debt or any  Person  acting on such
                holder's behalf to accelerate the maturity thereof.

                These waivers do not affect the Borrower's obligation to pay the
                $300,000 fee that was to be payable if the Rincon  Restructuring
                did not become effective on or before July 16, 1999, as required
                by  Section  3(b) of Waiver  No. 2 With  Respect  to the  Rincon
                Restructuring dated as of May 15, 1999.

        As used herein,  "Rincon Waivers  Termination Date" means the earlier of
September 30, 1999 and the first date, if any, when any of the following  events
shall occur:

        (i)     The Borrower or Perini Land and Development shall become a named
                party in any proceeding  relating to the Rincon Center  project,
                other  than  the   proceeding   commenced  by  Pacific   Gateway
                Properties, Inc., Case No. 301993 (the "PGP Lawsuit");

        (ii)    Any development occurs in the PGP Lawsuit that is adverse to the
                Borrower or Perini Land and Development;

        (iii)   An Event of Default  described  in Section  6.01(i)  shall occur
                with respect to Rincon Center Associates, other than an Event of
                Default  arising solely from Rincon Center  Associates'  failure
                generally to pay its debts as they become due; and

        (iv)    An  involuntary  case or other  proceeding  shall  be  commenced
                against   Rincon   Center   Associates   seeking    liquidation,
                reorganization or other relief with

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                                                                   Exhibit 10.25

                respect to it or its debts under any  bankruptcy,  insolvency or
                similar  law  now  or   hereafter   in  effect  or  seeking  the
                appointment  of a trustee,  receiver,  liquidator,  custodian or
                other  similar  official  of it or  any  material  part  of  its
                property.

        SECTION 7. Waiver of Minimum  Consolidated  Adjusted  Tangible Net Worth
Covenant.  The Banks  hereby  waive the  Borrower's  obligations  to comply with
Section 5.09 of the Credit  Agreement  through and including the Rincon  Waivers
Termination  Date.  This waiver shall not affect the  Borrower's  obligation  to
comply with Section 5.09 of the Credit  Agreement for any other period specified
therein.

        SECTION 8. Waiver of Condition to  Borrowings.  Solely for Borrowings on
any date  from  the  date  hereof  through  and  including  the  Rincon  Waivers
Termination Date, the Banks hereby waive the condition to Borrowing contained in
Section 3.02(d) of the Credit  Agreement,  but only to the extent such condition
cannot be  satisfied  due solely to the  inability  of the  Borrower to make the
representation and warranty contained in Section 4.04(c) of the Credit Agreement
as a result of the  write-down of its  investment in the Rincon Center  project.
The Banks  acknowledge  that a Borrowing on any day from the date hereof through
and including the Rincon  Waivers  Termination  Date shall not be deemed to be a
representation  and  warranty by the  Borrower on such date as to the  condition
specified  in  Section  3.02(d)  to the  extent  that such  condition  is waived
hereunder.

        SECTION 9.  Representations  and  Warranties  Correct;  No Default.  The
Borrower  represents  and  warrants  that on and as of the date  hereof  (a) the
representations  and  warranties  of each Obligor  contained  in each  Financing
Document,  as  amended,  to  which  it is a  party  are  true,  other  than  the
representation and warranty contained in Section 4.04(c) of the Credit Agreement
to the extent that the Borrower cannot make such representation and warranty due
solely to the status of the Rincon  Center  project and (b) no Default under the
Credit Agreement exists.

        SECTION 10.  Effect of Amendments  and Waivers.  Except as expressly set
forth herein,  the amendments and waivers  contained herein shall not constitute
an amendment  or waiver of any term or condition of the Credit  Agreement or any
other Financing Document, and all such terms and conditions shall remain in full
force and effect and are hereby ratified and confirmed in all respects.

        SECTION 11.  Governing  Law. This Amendment and Waiver shall be governed
by and construed in accordance with the laws of the State of New York.

        SECTION 12. Counterparts. This Amendment and Waiver may be signed in any
number of counterparts, each of which shall be an original, with the same effect
as if the signatures thereto and hereto were upon the same instrument.

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                                                                   Exhibit 10.25

        SECTION 13. Consent by Subsidiary Guarantors.  By signing this Amendment
and Waiver below,  each Subsidiary  Guarantor  affirms its obligations under the
Subsidiary  Guarantee  Agreement and acknowledges that this Amendment and Waiver
shall not alter, release, discharge or otherwise affect any of such obligations,
all of which shall  remain in full force and effect and are hereby  ratified and
confirmed in all respects.

        SECTION  14.  Effectiveness.  This  Amendment  and Waiver  shall  become
effective as of the date hereof when the Agent shall have received:

        (a)     duly executed  counterparts hereof signed by the Borrower,  each
                Bank and each Subsidiary Guarantor (or, in the case of any party
                as  to  which  an  executed  counterpart  shall  not  have  been
                received,  the Agent shall have received  telegraphic,  telex or
                other  written  confirmation  from such party of  execution of a
                counterpart hereof by such party); and

        (b)     the  $300,000  fee payable in  accordance  with  Section 3(b) of
                Waiver No. 2 With Respect to the Rincon  Restructuring  dated as
                of May 15, 1999.

        SECTION  15.  Effect of Rincon  Waivers  Termination  Date.  The waivers
granted  pursuant to Sections  6, 7 and 8 shall  terminate  and be of no further
force and effect on the Rincon Waivers Termination Date. The Banks shall retain,
and upon such  termination the Banks shall be entitled to exercise,  any and all
rights and remedies with respect to the Defaults waived pursuant thereto.

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                                                                   Exhibit 10.25


        IN WITNESS  WHEREOF,  the parties  hereto have caused this Amendment and
Waivers to be duly executed by their  respective  authorized  officers as of the
date first above written.