Exhibit 10.18

                       AMENDMENT NO. 1 TO CREDIT AGREEMENT

        AMENDMENT  NO. 1 dated as of November 10, 1997 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 the Agent are parties to an Amended
and  Restated  Credit  Agreement  dated as of  January  17,  1997  (the  "Credit
Agreement");

        WHEREAS,  the Borrower has requested an amendment to the operating  cash
flow covenant  contained in Section 5.10 of the Credit  Agreement for the period
from January 1, 1997 through September 30, 1997;

        WHEREAS,   the  Borrower  and  the  Banks  have  agreed  to  modify  the
obligations  of the Borrower  under Section 9.03 of the Credit  Agreement to pay
certain out-of-pocket expenses of the Agent;

        NOW, THEREFORE, the parties hereto agree as follows:

        SECTION  1.  Definitions;   References.  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 of Minimum  Operating  Cash Flow Covenant.  Section
5.14 of the Credit  Agreement is amended to change the minimum amount  Operating
Cash Flow  required for the period from January 1, 1997  through  September  30,
1997 from "$0" to "($8,000,000)".

        SECTION 3.  Amendments  to  Expense  Provision.  Section  9.03(a) of the
Credit Agreement is amended (a) to change the reference to "$60,000"  therein to
"$85,000" and (b) to change the reference to "$50,000" therein to "$75,000".

        SECTION 4. Agreement to Provide  Detailed  Plan. The Borrower  agrees to
provide each Bank,  prior to the date of its meeting with the Banks in December,
1997,  a plan  describing  the  steps  that it will take to  ensure  its  future
compliance  with the  covenants  contained in the Credit  Agreement,  which plan
shall be in sufficient  detail as may be  reasonably  acceptable to the Required
Banks.

        SECTION 5.  Representations  and  Warranties  Correct;  No Default.  The
Borrower and each Subsidiary Guarantor represents and warrants that on and as of
the  date  hereof,  after  giving  effect  to  this  Amendment  No.  1,  (a) the
representations  and  warranties  of each Obligor  contained  in each  Financing
Document,  as amended,  to which it is a party are true and (b) no Default under
the Credit Agreement exists.

        SECTION 6. Effect of  Amendments.  Except as expressly set forth herein,
the amendments  contained  herein shall not constitute an amendment or waiver of
any  term  or  condition  of the  Credit  Agreement  or of 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 7.  Governing  Law.  This  Amendment  shall be  governed  by and
construed in accordance with the laws of the State of New York.

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                                                                   Exhibit 10.18

        SECTION 8.  Counterparts.  This Amendment 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.

        SECTION 9. Consent by Subsidiary  Guarantors.  By signing this Amendment
below,  each Subsidiary  Guarantor  affirms its obligations under the Subsidiary
Guarantee  Agreement  and  acknowledges  that this  Amendment  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 10. Effectiveness.  This Amendment No. shall become effective as
of  the  date  hereof  when  the  Agent  shall  have  received   dully  executed
counterparts  hereof  signed by the Borrower,  the Required  Banks and the Agent
(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).

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