SUPPLEMENT NO. 1 TO
                          OFFER TO PURCHASE FOR CASH BY

                          QUADRANGLE ASSOCIATES III LLC
         TO PURCHASE UP TO 964 UNITS OF LIMITED PARTNERSHIP INTEREST IN
               WINTHROP CALIFORNIA INVESTORS LIMITED PARTNERSHIP,
                         A DELAWARE LIMITED PARTNERSHIP,
                           FOR $2,450 PER UNIT IN CASH

- --------------------------------------------------------------------------------
  OUR OFFER AND YOUR WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK
          CITY TIME, ON MARCH 26, 2004, UNLESS WE EXTEND THE DEADLINE.
- --------------------------------------------------------------------------------

         On February 12, 2004, we offered to purchase up to 964 (27.54%) of the
outstanding units of limited partnership interest of Winthrop California
Investors Limited Partnership ("your partnership") for a purchase price of
$2,450 per limited partnership interest upon the terms and subject to the
conditions set forth in our offer to purchase dated February 12, 2004 and in the
related letter of transmittal. Capitalized terms used in this Supplement No. 1
that are not defined shall have the meaning given to such term in our offer to
purchase.

         The purpose of this Supplement No. 1 is to (i) clarify certain
information provided and to provide certain additional information that you
might find informative and helpful in making your decision whether to tender
your units and (ii) to advise you that we have extended the expiration date of
our offer so that our offer will now expire at 12:00 midnight, New York time on
March 26, 2004. At the close of business on March 8, 2004, 109.09 units had been
tendered pursuant to the Offer.

         In this regard, please note the following:

               o    As indicated in the Offer to Purchase, your partnership
                    entered into a Settlement Agreement on October 3, 2003 with,
                    among others, the general partner of the Development
                    Partnership pursuant to which your partnership is entitled
                    to receive a preference payment of $22,000,000 if certain
                    conditions are met. You should be aware that if you tender
                    your units in our offer, you will not receive the benefits
                    of this preference payment. Further, you should note that
                    your partnership does not presently know when its interest
                    in the Development Partnership will be liquidated; although
                    your partnership has agreed that when, and if, it receives
                    the preference amount it will surrender its interest in the
                    Development Partnership.

               o    We are offering to purchase your units for a purchase price
                    of $2,450 per unit. We will not charge any fees in
                    connection with such purchase nor will you be responsible
                    for the fees customarily charged by your partnership's
                    transfer agent. However, as indicated in the Summary Term
                    Sheet of our Offer to Purchase, if you hold your units in a
                    custodial or other beneficiary account (i.e., an IRA



                    account or a trust account) you may be subject to certain
                    fees payable to your custodian or trustee.

               o    As we previously indicated, we are affiliated with the
                    general partner of your partnership. As set forth in Section
                    10., pursuant to the terms of your partnership's partnership
                    agreement, the general partner of your partnership, our
                    affiliate, is entitled to receive an annual fee of $750,000
                    from your partnership. Accordingly, a conflict of interest
                    can arise between continuing your partnership and receiving
                    such fees, and the liquidation of your partnership and the
                    termination of such fees.

               o    If more than 964 units are tendered, we will announce upon
                    expiration of the offer that the offer is oversubscribed and
                    will advise you of the pro ration factor at such time as
                    payment is made for the accepted units. Payment for units
                    will be made promptly following the expiration date.

               o    We have attached to this Supplement No. 1 as Schedule II our
                    most recent financial statements. As indicated in the
                    financial statements, we have adequate funds to pay
                    tendering limited partners for units tendered, and our offer
                    is not conditioned on our obtaining any financing.

               o    We are a Delaware limited liability company formed in
                    February 2004. Our sole member is Bulfinch Group LLC, a
                    Delaware limited liability company that indirectly holds an
                    approximately 58% interest in your general partner.

               o    As indicated above, we will promptly pay for all tendered
                    units accepted for purchase promptly following the
                    expiration of the offer. Although we do not foresee any
                    circumstances that will effect our ability to promptly pay
                    for such units, it is possible that a situation may occur
                    that will impair our ability to promptly pay such as a suit
                    brought to enjoin our purchase of units, a banking
                    moratorium or other circumstances out of our control. In
                    such an event, without prejudice to our rights under the
                    offer, we may retain tendered units and those units may only
                    be withdrawn to the extent permitted in Section 4 of the
                    Offer to Purchase. In any event, our obligations pursuant to
                    Rule 14e-1(c) under the Exchange Act, to pay the offer price
                    in respect of units tendered or return those units promptly
                    after termination or withdrawal of the offer.

               o    As indicated in Section 14 of the Offer to Purchase, our
                    offer is subject to a number of conditions. Please note that
                    if we waive a material condition, our offer will remain open
                    for at least five business days from the date of such
                    waiver. Further, any such conditions, other than the receipt
                    of government or regulatory approval, will either be
                    satisfied or waived on or prior to the expiration date. You
                    should note further that to the extent we are required to
                    make a filing or declaration, the failure to do so will not
                    relieve us of our obligations to consummate our offer.
                    However, if we do not receive any requisite government

                                       2


                    or regulatory approvals to enable us to consummate our
                    offer, we will have no obligation to accept or make payment
                    for units.

         If you have any questions relating to our offer, please do not hesitate
to call us toll free at (888) 448-5554

                                                   QUADRANGLE ASSOCIATES III LLC

March 9, 2004











                                       3


                                                                     Schedule II






                          QUADRANGLE ASSOCIATES III LLC
                          (A DEVELOPMENT STAGE COMPANY)

                                  BALANCE SHEET
                                  MARCH 4, 2004























                                      II-1


                          QUADRANGLE ASSOCIATES III LLC
                          (A DEVELOPMENT STAGE COMPANY)

                                Table of Contents
                                  March 4, 2004





                                                                            Page
                                                                            ----

INDEPENDENT AUDITORS' REPORT                                                II-3

FINANCIAL STATEMENT

Balance Sheet                                                               II-4
Notes to Financial Statement                                                II-5





















                                      II-2


                          Independent Auditors' Report


To the Member
Quadrangle Associates III LLC

We have audited the accompanying balance sheet of Quadrangle Associates III LLC
(a development stage company), (the "Company"), as of March 4, 2004. This
financial statement is the responsibility of the Company's management. Our
responsibility is to express an opinion on this financial statement based on our
audit.

We conducted our audit in accordance with auditing standards generally accepted
in the United States of America. Those standards require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statement. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audit provides a
reasonable basis for our opinion.

In our opinion, the financial statement referred to above presents fairly, in
all material respects, the financial position of the Company as of March 4, 2004
in conformity with accounting principles generally accepted in the United States
of America.








                                                   /s/ Imowitz Koenig & Co., LLP



New York, New York
March 4, 2004








                                      II-3


                          QUADRANGLE ASSOCIATES III LLC
                          (A Development Stage Company)

                                  Balance Sheet
                                  March 4, 2004




ASSETS

Cash                                                                    $ 25,000
                                                                       =========
LIABILITIES AND MEMBER'S EQUITY

Liabilities:
Accrued Expenses                                                        $  3,000

Member's Equity                                        $ 2,500,000
Deficit Accumulated During the Development Stage            (3,000)
Subscription Receivable                                 (2,475,000)
                                                     -------------


            TOTAL MEMBER'S EQUITY                                         22,000
                                                                       ---------
            TOTAL LIABILITIES AND MEMBER'S EQUITY                       $ 25,000
                                                                       =========










                       See Notes to Financial Statement.

                                      II-4


                          QUADRANGLE ASSOCIATES III LLC
                          (A DEVELOPMENT STAGE COMPANY)

                          Notes to Financial Statement
                                  March 4, 2004

Note 1 - ORGANIZATION

         Quadrangle Associates III LLC (the "Company") was organized on February
11, 2004. The Company is owned by Bulfinch Group LLC, a Delaware limited
liability company, and managed by WIN Manager Corp., a Delaware corporation,
which is a related party of the Company. The Company was formed to acquire, own
and ultimately dispose of limited partnership interests in Winthrop California
Investors Limited Partnership. As of March 4, 2004 the Company is still in the
development stage as principal operations have not yet commenced.

Note 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

         Use of Estimates

         The preparation of financial statements in conformity with accounting
         principles generally accepted in the United States of America requires
         management to make estimates and assumptions that affect the amounts
         reported in the financial statements and accompanying notes. Actual
         results could differ from these estimates.

         Income Taxes

         The Company is not subject to Federal, State and Local income taxes;
         accordingly, the Company makes no provision for income taxes in its
         financial statement. The member is liable for income taxes on its share
         of the Company's taxable income.

         Financial Instruments

         SFAS No. 107, "Disclosures About Fair Value of Financial Instruments,"
         requires disclosures of fair values of financial instruments for which
         it is practicable to estimate that value. Based on available market
         information, the Company estimates that the fair value of its financial
         assets and liabilities approximates their carrying value.

         Recently Issued Accounting Standards

         In January 2003, the FASB issued Interpretation No. 46, "Consolidation
         of Variable Interest Entities." This interpretation clarifies the
         application of existing accounting pronouncements to certain entities
         in which equity investors do not have the characteristics of a
         controlling financial interest or do not have sufficient equity at risk
         for the entity to finance its activities without additional
         subordinated financial support from other parties. In December 2003,
         the FASB issued a revision to Interpretation No. 46 ("46R") to clarify
         some of the provisions of Interpretation No. 46, and to exempt certain
         entities from its requirements. The provisions of the interpretation
         need to be applied no later than December 31, 2004, except for entities
         that are considered to be special- purpose entities which need to be
         applied as of December 31, 2003. This interpretation had no effect on
         the Company's financial statement.

                                      II-5


                          QUADRANGLE ASSOCIATES III LLC
                          (A DEVELOPMENT STAGE COMPANY)

                          Notes to Financial Statement
                                  March 4, 2004

         In April 2003, the FASB issued SFAS No. 149, "Amendment of SFAS No. 133
         on Derivative Instruments and Hedging Activities." This statement
         amends and clarifies financial accounting and reporting for derivative
         instruments, including certain derivative instruments embedded in other
         contracts (collectively referred to as derivatives) and for hedging
         activities under SFAS No. 133, "Accounting for Derivative Instruments
         and Hedging Activities." The changes in this statement improves
         financial reporting by requiring that contracts with comparable
         characteristics be accounted for similarly. In particular, this
         statement (1) clarifies under what circumstances a contract with an
         initial net investment meets the characteristic of a derivative
         discussed in SFAS No. 133, (2) clarifies when a derivative contains a
         financing component, (3) amends the definition of an underlying that is
         related to an asset, liability or equity security to conform it to
         language used in FASB Interpretation No. 45, and (4) amends certain
         other existing pronouncements. Those changes will result in more
         consistent reporting of contracts as either derivatives or hybrid
         instruments. This statement is effective for contracts entered into or
         modified after June 30, 2003, and for hedging relationships designated
         after June 30, 2003. The guidance should be applied prospectively. The
         provisions of this statement that relate to SFAS No. 133 implementation
         issues that have been effective for fiscal quarters that began prior to
         June 15, 2003, should continue to be applied in accordance with their
         respective effective dates. In addition, certain provisions relating to
         forward purchases or sales of when-issued securities or other
         securities that do not yet exist, should be applied to existing
         contracts as well as new contracts entered into after June 30, 2003.
         This statement had no effect on the Company's financial statement.

         In May 2003, the FASB issued SFAS No. 150, "Accounting for Certain
         Financial Instruments with Characteristics of both Liabilities and
         Equity." The statement improves the accounting for certain financial
         instruments that under previous guidance, issuers could account for as
         equity. The new statement requires that those instruments be classified
         as liabilities in statements of financial position. SFAS No. 150
         affects the issuer's accounting for three types of freestanding
         financial instruments. One type is mandatorily redeemable shares, which
         the issuing company is obligated to buy back in exchange for cash or
         other assets. A second type, which includes put options and forward
         purchase contracts, involves instruments that do or may require the
         issuer to buy back some of its shares in exchange for cash or other
         assets. The third type of instruments that are liabilities under this
         statement is obligations that can be settled with shares, the monetary
         value of which is fixed, tied solely or predominantly to a variable
         such as a market index, or varies inversely with the value of the
         issuers' shares. SFAS No. 150 does not apply to features embedded in a
         financial instrument that is not a derivative in its entirety. In
         addition to its requirements for the classification and measurement of
         financial instruments in its scope, SFAS No. 150 also requires
         disclosures about alternative ways of settling the instruments and the
         capital structure of entities, all of whose shares are mandatorily
         redeemable. Most of the guidance in SFAS No. 150 is effective for all
         financial instruments entered into or modified after May 31,

                                      II-6



                          QUADRANGLE ASSOCIATES III LLC
                          (A DEVELOPMENT STAGE COMPANY)

                          Notes to Financial Statement
                                  March 4, 2004

         2003, and otherwise was effective at the beginning of the first interim
         period beginning after June 15, 2003. This statement had no effect on
         the Company's financial statement.

Note 3 - SUBSCRIPTION RECEIVABLE

         The subscription receivable from the sole member of the Company is due
on demand, accrues interest at the rate for demand loans as set forth in
Internal Revenue Code Section 7872 and is unsecured.















                                      II-7