EQUITY OFFICE PROPERTIES TRUST
SC 13D, 2000-02-18
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

EQUITY OFFICE PROPERTIES TRUST
(Name of Issuer)

COMMON SHARES OF BENEFICIAL INTEREST, PAR VALUE $.01
(Title of Class of Securities)

294741103
(CUSIP Number)

ANN F. CHAMBERLAIN, ESQ.
RICHARDS & O'NEIL, LLP
885 THIRD AVENUE
NEW YORK, NEW YORK
10022-4873
(212) 207-1200
(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

FEBRUARY 11, 2000
(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box. / /


                                  Page 1 of 62

<PAGE>

                                  SCHEDULE 13D

CUSIP NO. 294741103

<TABLE>
<S>       <C>                                           <C>
(1)       Name of reporting person....................  STICHTING PENSIOENFONDS VOOR
                                                        DE GEZONDHEID GEESTELIJKE EN
                                                        MAATSCHAPPELIJKE BELANGEN

          S.S. or I.R.S. identification Nos. of above
          persons.....................................

(2)       Check the appropriate box if a member of a    (a)  / /
          group (see instructions)
                                                        (b)  / /

(3)       SEC use only................................

(4)       Source of funds (see instructions)..........  WC/OO

(5)       Check if disclosure of legal proceedings is
          required pursuant to items 2(d) or 2(e).....  / /

(6)       Citizenship or place of organization........  The Netherlands
Number of shares beneficially owned by each
reporting person with:

(7)       Sole voting power...........................  2,542,100

(8)       Shared voting power.........................  0

(9)       Sole dispositive power......................  2,542,100

(10)      Shared dispositive power....................  0

(11)      Aggregate amount beneficially owned by each
          reporting person............................  22,044,253

(12)      Check box if the aggregate amount in Row
          (11) excludes certain shares (see
          instructions)...............................  / /

(13)      Percent of class represented by amount in
          Row (11)....................................  7.38%

(14)      Type of reporting person (see instructions).  OO

</TABLE>


                                 Page 2 of 62
<PAGE>

EQUITY OFFICE PROPERTIES TRUST SCHEDULE 13D

ITEM 1.           SECURITY AND ISSUER.

         This Statement relates to the common shares of beneficial interest of
Equity Office Properties Trust ("EOP" or the "Company") which, to the best
knowledge of the person filing this Statement, is a real estate investment trust
organized under the laws of Maryland with principal executive offices at Two
North Riverside Plaza, Chicago, IL 60606.

ITEM 2.           IDENTITY AND BACKGROUND.

         This Statement is filed by Stichting Pensioenfonds voor de Gezondheid
Geestelijke en Maatschappelijke Belangen ("PGGM" or the "REPORTING PERSON").

         (a)      Stichting Pensioenfonds voor de Gezondheid Geestelijke en
Maatschappelijke Belangen.

         (b)      The business address of PGGM is Kroostweg-Noord 149, 3700 AC
Zeist, The Netherlands. The name and business address of each executive officer
and director of PGGM is set forth on EXHIBIT A and is incorporated by reference
herein.

         (c)      The principal business of PGGM is to serve as a pension fund
in The Netherlands which invests for the benefit of health care industry
workers, including nurses and medical technicians, but excluding self-employed
doctors. The present principal occupation of each executive officer and director
of PGGM is set forth on EXHIBIT A and is incorporated by reference herein.

         (d)      Neither PGGM nor any of its executive officers or directors
has, during the last five years, been convicted in any criminal proceeding
(excluding traffic violations and similar misdemeanors).

         (e)      Neither PGGM nor any of its executive officers or directors
has, during the last five years, been a party to a civil proceeding of a
judicial or administrative body of competent jurisdiction as a result of which
proceeding it or he or she was or is subject to a judgment, decree or final
order enjoining future violations of, or prohibiting or mandating activities
subject to, federal or state securities laws or finding any violation with
respect to such laws, decree or final order.

         (f)      PGGM is a "stichting" organized under the laws of The
Netherlands. The citizenship of each executive officer and director of PGGM is
set forth on EXHIBIT A and is incorporated by reference herein.

ITEM 3.           SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         Pursuant to the Agreement and Plan of Merger, dated February 11, 2000
(the "MERGER AGREEMENT"), between EOP, EOP Operating Limited Partnership ("EOP
PARTNERSHIP"), Cornerstone Properties Inc. ("CORNERSTONE") and Cornerstone
Properties Limited Partnership ("CORNERSTONE PARTNERSHIP"), subject to the
conditions set forth therein, Cornerstone will merge with and into EOP and
Cornerstone Partnership will merge with and into EOP Partnership.

         Upon the consummation of the transactions contemplated under the
Merger Agreement, holders of common stock of Cornerstone ("CORNERSTONE COMMON
STOCK"), and holders of Class A common units of limited partner interest of
Cornerstone Partnership ("CORNERSTONE OP UNITS"), shall be entitled to elect
to receive, for each share or unit, as the case may be, either 0.7009 of a
share of beneficial interest of EOP ("COMMON SHARES") (or, in the case of the
Cornerstone OP Units, 0.7009 of a Class A Unit of EOP Partnership ("EOP OP
UNITS")), or $18.00 per share (or per unit, as the case may be) in cash,
subject to proration as provided in the Merger Agreement.

         Upon the consummation of the transactions contemplated under the
Merger Agreement, the 45,779,703 common shares of Cornerstone owned by PGGM
as of the date hereof will be converted at the Effective Time of the Merger
(as each term is defined in the Merger Agreement) into 19,502,153 EOP Common
Shares (assuming pro rata conversion of the outstanding shares of Cornerstone

                                 Page 3 of 62
<PAGE>

Common Stock held by all holders of such shares into the right to receive
$7.06 in cash and .7009 Common Shares of EOP). Immediately prior to the
execution of the Merger Agreement, PGGM beneficially owned 2,542,100 shares
of Common Shares, which it purchased on the open market with funds from its
working capital.

ITEM 4.           PURPOSE OF TRANSACTIONS.

         The Reporting Person has acquired Common Shares previously and intends
to acquire the Common Shares included in this Statement for investment. PGGM
also intends to influence the control of the Company inasmuch as it has the
right to designate one member to the Board of Trustees of the Company (the
"COMPANY BOARD") under certain conditions as described below in Item 6. PGGM may
sell and buy Common Shares from time to time, subject to the restrictions
contained in the Voting Agreement and the Amended and Restated Registration
Rights and Voting Agreement described below in Item 6.

         The Reporting Person has no plan or proposal which relates to or would
result in any of the actions enumerated in Item 4 of Schedule 13D, except as
described in Item 6 below.

ITEM 5.           INTEREST IN SECURITIES OF THE ISSUER.

         (a)      Pursuant to the Merger Agreement (assuming the transactions
contemplated thereunder are consummated) PGGM will acquire 19,502,153 Common
Shares (assuming pro rata conversion of the outstanding shares of Cornerstone
Common Stock held by all holders of such shares into the right to receive
$7.06 in cash and .7009 Common Shares of EOP). As of the date hereof, PGGM
has beneficial ownership of 2,542,100 Common Shares. Upon consummation of the
transactions contemplated under the Merger Agreement, PGGM will beneficially
own approximately 7.38% of the outstanding Common Shares (calculated by
dividing (1) the sum of (i) the number of Common Shares that PGGM will
acquire in the Merger (19,502,153) plus (ii) the number of Common Shares
beneficially owned as of the date hereof by PGGM (2,542,100) by (2) the sum
of (i) the number of Common Shares issued and outstanding as of January 31,
2000 (248,812,828) plus (ii) the number of Common Shares to be issued in the
Merger (49,824,682) (assuming pro rata conversion of the outstanding shares
of Cornerstone Common Stock held by all holders of such shares into the right
to receive $7.06 in cash and .7009 Common Shares of EOP). The above
calculation assumes that (i) prior to the Effective Time of the Merger, the
number of outstanding shares of Cornerstone Common Stock and Common Shares of
EOP will not change and (ii) no Cornersone OP Units will be converted into
shares of Cornerstone Common Stock.

         (b)      As of the date of filing of this Schedule 13D, the
Reporting Person has the power to vote or to direct the vote of or the power
to dispose or direct the disposition of the Common Shares that are
beneficially owned by it as follows:

<TABLE>
<CAPTION>
                                Beneficial                                                           No Right to
                                Ownership             Right to Vote           Right to Dispose       Vote or Dispose
                                ---------             -------------           ----------------       ---------------

<S>                            <C>                      <C>                      <C>                   <C>
PGGM                           22,044,253(1)            2,542,100                2,542,100             19,502,153

</TABLE>

(1)   See last sentence of paragraph (a) of Item 5.


                                 Page 4 of 62
<PAGE>

         (c)      The Reporting Person acquired 85,900 Common Shares of EOP
at a price of $22.75 per share on December 20, 1999 in an open market
transaction. The Reporting Person disposed of 17,200 Common Shares of EOP at
a price of $25.56 on January 28, 2000 in an open market transaction.

         (d)      None.

         (e)      Not applicable.

ITEM 6.           CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
                  RESPECT TO SECURITIES OF THE ISSUER

         Except for the information set forth in Items 3, 4, and 5 of this
Schedule 13D, the Merger Agreement and as described below in this Item 6, there
are no contracts, arrangements, understandings or relationships (legal or
otherwise) between the Reporting Person and any other person with respect to the
Common Shares.

         1.       VOTING AGREEMENT

         In connection with the transactions contemplated by the Merger
Agreement, EOP, EOP Partnership, WCP Services, Inc. ("WCP") and PGGM entered
into a Voting Agreement (the "VOTING AGREEMENT"), dated as of February 11, 2000,
a copy of which is attached as EXHIBIT B hereto.

         A.       DISPOSITION OF CORNERSTONE COMMON SHARES

         From the date of the Voting Agreement until the earlier of the date
on which the transactions contemplated by the Merger Agreement are
consummated or 30 days after the date on which the Merger Agreement is
terminated, PGGM may not, directly or indirectly, (i) sell, transfer, pledge,
encumber, assign or otherwise dispose of (or enter into any contract or other
understanding with respect to any of the foregoing) common shares of
Cornerstone; (ii) grant any proxies for any common shares of Cornerstone or
deposit any common shares of Cornerstone into a voting trust with respect to
any matters described in (i) above; (iii) tender any common shares of
Cornerstone in a transaction other than a transaction contemplated by the
Merger Agreement; or (iv) take any action which is intended to prevent or
disable PGGM from performing its obligations under the Voting Agreement.
Notwithstanding the foregoing, PGGM may transfer its common shares of
Cornerstone so long as the transferee thereof agrees in writing by the terms
of the Voting Agreement.

         B.       VOTING

         From the date of the Voting Agreement until the earlier of (i) the date
on which the transactions contemplated by the Merger Agreement are consummated
or (ii) 30 days after the date on which the Merger Agreement is terminated, PGGM
shall cast or cause to be cast all votes attributable to its shares of
Cornerstone in connection with any meeting to vote (i) in favor of adoption of
the Merger Agreement and approval of all transactions contemplated by the Merger
Agreement and (ii) against approval or adoption of any action or agreement
(other than the Merger Agreement and the transactions contemplated thereby) made
or taken in opposition to or in competition with the transactions contemplated
by the Merger Agreement.

         C.       REGISTRATION RIGHTS AGREEMENT

         Pursuant to Section 6 of the Voting Agreement, PGGM and EOP agree that,
effective upon the Effective Time of the Merger, each of PGGM and EOP will be
bound by the Amended and Restated Registration Rights and Voting Agreement (the
"REGISTRATION RIGHTS AGREEMENT") by and among Cornerstone, PGGM and Dutch
Institutional Holding Company, Inc. ("DIHC"), dated December 16, 1998, with
certain amendments thereto as provided in the Voting Agreement. The Registration
Rights


                                 Page 5 of 62
<PAGE>

Agreement is attached as EXHIBIT C hereto. Applicable provisions of the
Registration Rights Agreement (as amended by the Voting Agreement) are described
in Paragraph 2 below.

         D.       TRUSTEES

         Section 7 of the Voting Agreement provides that not later than the
third business day after the Effective Time of the Merger, Jan van der Vlist,
Director of Real Estate Investments for PGGM ("MR. VAN DER VLIST") shall become
a trustee of EOP, to serve on the Company Board for a term expiring in 2003.
Upon the expiration of the term of Mr. Van der Vlist in 2003 and 2006, so long
as PGGM and its affiliates continue to own in the aggregate at least 21,000,000
(as adjusted for stock splits, etc.) Common Shares at all times up to the
meeting of shareholders at which trustees are being elected in such years, EOP
shall take all action necessary to nominate Mr. Van der Vlist for re-election as
a trustee of EOP for an additional three-year term. In the event that Mr. Van
der Vlist shall fail to stand for re-election as aforesaid for any reason in
either 2003 or 2006 or in the event of his earlier death or resignation, and so
long as PGGM and its affiliates continue to own in the aggregate at least
21,000,000 (as adjusted for stock splits, etc.) Common Shares at such time, EOP
shall take all action necessary to nominate a replacement designated by PGGM,
which replacement shall be subject to the approval of EOP if such replacement is
not a director, officer or employee of PGGM, for an additional three-year term.

         2.       RESTATED REGISTRATION RIGHTS AGREEMENT

         All references herein to the Registration Rights Agreement include all
amendments thereto as contemplated by the Voting Agreement, which amendments
shall become effective upon the Effective Time of the Merger.

                  A.       REGISTRATION RIGHTS

         DEMAND REGISTRATION. The Registration Rights Agreement provides that,
subject to certain limitations, PGGM will have the right to demand, on no more
than eight occasions, that the Company register all or a portion of the Common
Shares issued to PGGM in connection with the Merger Agreement, subject to a
requirement that the market value of the shares requested to be registered as of
the date of any demand must equal or exceed $75 million (or the total aggregate
amount of shares held by PGGM, if less than $75 million). The Company must use
its commercially reasonable efforts to effect any such registration on demand
and will have the ability to defer the filing of a registration statement
relating to a demand in certain circumstances.

         SHELF REGISTRATION. Within 20 days after the request of PGGM following
the Effective Time of the Merger, the Company will use its commercially
reasonable effects to cause the registration of all of the Common Shares issued
to PGGM in connection with the Merger Agreement on a registration statement
which provides for the offering of such securities on a delayed or continuous
basis. Prior to selling Common Shares under such registration statement, PGGM
must give written notice to the Company of its intent to sell Common Shares. The
Company will have the right in certain circumstances to defer such intended
sales.

         PIGGYBACK REGISTRATION. In the event that the Company exercises its
rights to defer a requested registration, suspend the effectiveness of the shelf
registration or sales of Common Shares by PGGM due to a contemplated public
offering of Common Shares, PGGM will have the right to include its shares in the
Company's registration statement relating to such public offering. These
piggyback registration rights will be subject to certain customary limitations
as well as limitations contained in the other agreements between the Company and
its stockholders.

         All such registrations will be at the expense of the Company, except
that PGGM will bear all underwriting discounts and commissions and fees and
expenses of its own counsel.


                                 Page 6 of 62
<PAGE>

                  B.       STANDSTILL AGREEMENT

         PGGM agrees, pursuant to the Registration Rights Agreement, that until
90 days after the date on which no trustee nominated by PGGM as described in
paragraph 1D above remains a trustee of the Company Board, it shall not:

                  (i)      directly or indirectly purchase or otherwise acquire,
                           or propose or offer to purchase or otherwise acquire,
                           any "Equity Securities" (as defined below) if,
                           immediately after such purchase or acquisition, PGGM
                           and its affiliates would own 12% or more of the
                           Common Shares;

                  (ii)     directly or indirectly propose to the Company or any
                           person or entity a "Business Combination" (as defined
                           below);

                  (iii)    make, or in any way participate in, any
                           "solicitation" of "proxies" to vote (as such terms
                           are used in the rules promulgated by the Securities
                           Exchange Commission under Section 14(a) of the
                           Securities Exchange Act of 1934 (the "EXCHANGE ACT")
                           or seek to advise, encourage or influence any person
                           or entity with respect to the voting of any shares of
                           capital stock of the Company, initiate, propose or
                           otherwise solicit stockholders of the Company for the
                           approval of one or more stockholder proposals or
                           induce or attempt to induce any other person or
                           entity to initiate any stockholder proposal; or

                  (iv)     deposit any equity securities of the Company into a
                           voting trust or subject any equity securities to any
                           arrangement or agreement with respect to the voting
                           of such securities or form, join or in any way
                           participate in a "group" (within the meaning of
                           Section 13(d)(3) of the Exchange Act) with respect to
                           any equity securities, except as contemplated by this
                           Agreement.

         The Registration Rights Agreement provides that nothing in the
provisions described in clauses (i), (ii), (iii) and (iv) above limits the
ability of a trustee to function in his capacity as a member of the Company
Board.

         The foregoing standstill provision may be waived by the Company only
upon the approval of a majority of its Board, excluding any trustee nominated by
PGGM, and is not applicable to actions approved by the majority of the Company
Board, excluding any trustee nominated by PGGM in circumstances in which any
trustee nominated by PGGM is an "interested director" under Section 2-419 of the
Maryland General Corporation Law.

         "Business Combination" means any one of the following transactions:

                  (i)      Any merger or consolidation of the Company or any
                           subsidiary thereof with any person or entity
                           (other than the Company);

                  (ii)     Any sale, lease exchange, mortgage, pledge, transfer
                           or other disposition by the Company (in one
                           transaction or a series of transactions) to or with
                           any person or entity of all or a substantial portion
                           of the assets of the Company and its subsidiaries
                           taken as a whole;

                  (iii)    The adoption of any plan or proposal for the
                           liquidation or dissolution of the Company proposed
                           by or on behalf of the Reporting Person or any
                           affiliate thereof; or

                                 Page 7 of 62
<PAGE>

                  (iv)     Any reclassification of securities (including any
                           reverse stock split), recapitalization of the
                           Company, or any merger or consolidation of the
                           Company with any subsidiary thereof or any other
                           transaction to which the Company is a party which
                           has the effect, directly or indirectly, of
                           increasing the proportionate share of the Reporting
                           Person or any affiliate thereof (whether or not with
                           or into or otherwise involving PGGM or any affiliate
                           of PGGM).

         "Equity Security" means any (i) Common Shares, (ii) securities of the
Company convertible into or exchangeable for Common Shares, and (iii) options,
rights, warrants and similar securities issued by the Company to acquire Common
Shares.

ITEM 7.           MATERIAL TO BE FILED AS EXHIBITS.

         EXHIBIT A contains the name, citizenship, office, business address and
present principal occupation of each executive officer and director of PGGM.

         EXHIBIT B is the Voting Agreement between EOP, EOP Partnership, WCP and
PGGM, dated February 11, 2000, the provisions of which are described in this
Schedule 13D.

         EXHIBIT C is the Amended and Restated Registration Rights and Voting
Agreement entered into by PGGM, DIHC and Cornerstone on December 16, 1998,
certain provisions of which are described in this Schedule 13D.


                                 Page 8 of 62
<PAGE>

SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this Statement is true, complete and
correct.

Dated:  February 18, 2000

                                    STICHTING PENSIOENFONDS VOOR DE
                                    GEZONDHEID GEESTELIJKE EN
                                    MAATSCHAPPELIJKE BELANGEN

                                    By:  /s/ Jan H.W.R. van der Vlist
                                       --------------------------------------
                                         Name:  Jan H.W.R. van der Vlist
                                         Title: Director of Real Estate

                                    By:  /s/ Anneke C. van de Puttelaar
                                       --------------------------------------
                                         Name:  Anneke C. van de Puttelaar
                                         Title: Portfolio Manager Real Estate


                                 Page 9 of 62
<PAGE>


EXHIBIT A

         The name, citizenship, business address and present principal
occupation of each executive officer and director of PGGM is as follows:


<TABLE>
<CAPTION>

Name and Citizenship                        Present principal office               Occupation and Address
- --------------------                        ------------------------               ----------------------
<S>                                         <C>                                    <C>

Dick J. de Beus (Mr.)                       Executive Officer                      Pensioenfonds PGGM
(The Netherlands)                           Chairman, Board of Managing            Kroostweg-Noord 149
                                            Directors                              P.O. Box 117
                                                                                   3700 AC Zeist
                                                                                   The Netherlands

Roderick M.S.M. Munsters (Mr.)              Executive Officer, Managing            Pensioenfonds PGGM
(The Netherlands)                           Directors Investments                  Kroostweg-Noord 149
                                                                                   P.O. Box 117
                                                                                   3700 AC Zeist
                                                                                   The Netherlands

Heino J. van Essen (Mr.)                    Executive Officer, Managing            Pensioenfonds PGGM
(The Netherlands)                           Directors Pensions                     Kroostweg-Noord 149
                                                                                   P.O. Box 117
                                                                                   3700 AC Zeist
                                                                                   The Netherlands

J.C.J. Lammers (Mr.)                        Chairman of the Board of               Leidsegracht 25
(The Netherlands)                           PGGM                                   1017 NA Amsterdam
                                                                                   The Netherlands

W.L. Bonhof (Mr.)                           Board Member,                          Zon en Schild
(The Netherlands)                           Vice Chairman                          Utrechtseweg 266
                                                                                   P.O. Box 3051
                                                                                   3800 DB  Amersfoort
                                                                                   The Netherlands

A.T.J. Krol (Mr.)                           Board Member                           Vereniging Gehandicapten-zorg
(The Netherlands)                                                                  Nederland (VGN)
                                                                                   P.O. Box 9696
                                                                                   3506 GR Utrecht
                                                                                   The Netherlands

J. Wagenaar (Mr.)                           Board Member                           NVZ vereniging voor ziekenhuizen
(The Netherlands)                                                                  P.O. Box 9696
                                                                                   3506 GR Utrecht
                                                                                   The Netherlands

J. Hillenius (Mr.)                          Board Member,                          Meije 342
(The Netherlands)                           Vice Chairman                          3474 ME Zegveld
                                                                                   The Netherlands
</TABLE>

                                 Page 10 of 62

<PAGE>

<TABLE>
<CAPTION>

Name and Citizenship                        Present principal office               Occupation and Address
- --------------------                        ------------------------               ----------------------
<S>                                         <C>                                    <C>

W.H. de Weijer (Mr.)                        Board Member                           Zorg en Wonen
(The Netherlands)                                                                  Zaanstreek/Waterland
                                                                                   P.O. Box 68
                                                                                   1440 AB Purmerend
                                                                                   The Netherlands

H.D. Cornelissen (Mr.)                      Board Member                           Professor
(The Netherlands)                                                                  Duboisstichting
                                                                                   P.O. Box 694
                                                                                   5900 AR Venlo
                                                                                   The Netherlands

J.W. Dieten (Mr.)                           Board Member                           ABVAKABO
(The Netherlands)                                                                  (Trade Union)
                                                                                   P.O. Box 3010
                                                                                   2700 KT Zoetermeer
                                                                                   The Netherlands

A.J.M. van Huygevoort (Mr.)                 Board Member                           ABVAKABO
(The Netherlands)                                                                  (Trade Union)
                                                                                   P.O. Box 3010
                                                                                   2700 KT Zoetermeer
                                                                                   The Netherlands

J. F. van Pijpen (Mrs.)                     Board Member                           ABVAKABO
(The Netherlands)                                                                  (Trade Union)
                                                                                   P.O. Box 3010
                                                                                   2700 KT Zoetermeer
                                                                                   The Netherlands

E. de Bruin (Mr.)                           Board Member                           CFO (Trade union)
(The Netherlands)                                                                  P.O. Box 84500
                                                                                   2508 AM Den Haag
                                                                                   the Netherlands

K. Kruithof (Mr.)                           Board Member                           CFO (Trade Union)
(The Netherlands)                                                                  P.O. Box 84500
                                                                                   2508 AM Den Haag
                                                                                   The Netherlands

K. de Jong (Mr.)                            Board Member                           NU '91 (Trade Union)
(The Netherlands)                                                                  Leidseweg 63
                                                                                   P.O. Box 6001
                                                                                   3503 PA Utrecht
                                                                                   The Netherlands

</TABLE>

                                 Page 11 of 62

<PAGE>



                                VOTING AGREEMENT

                                     (PGGM)

                  THIS VOTING AGREEMENT (this "AGREEMENT") is entered into as of
February 11, 2000 by and among Equity Office Properties Trust, a Maryland real
estate investment trust ("EOP"), EOP Operating Limited Partnership, a Delaware
limited partnership ("EOP PARTNERSHIP"), WCP Services, Inc., a Delaware
corporation ("WCP"), and Stichting Pensioenfonds voor de Gezondheid, Geestelijke
en Maatschappelijke Belangen, a stichting formed according to the laws of the
Kingdom of The Netherlands ("PGGM").

                  WHEREAS, EOP, EOP Partnership, Cornerstone Properties, Inc., a
Nevada corporation ("CORNERSTONE"), Cornerstone Properties Limited Partnership,
a Delaware limited partnership ("CORNERSTONE PARTNERSHIP"), will enter into an
Agreement and Plan of Merger dated as of the date hereof (the "MERGER
AGREEMENT"), pursuant to which (i) Cornerstone Partnership will be merged with
and into EOP Partnership (the "PARTNERSHIP MERGER"), with EOP Partnership as the
survivor of the Partnership Merger, and (ii) Cornerstone will be merged with and
into EOP (the "MERGER"), with EOP as the survivor of the Merger (all capitalized
terms used but not defined herein shall have the meanings set forth in the
Merger Agreement);

                  WHEREAS, PGGM is the beneficial and record owner of 45,779,703
issued and outstanding shares of common stock, with no par value per share, of
Cornerstone (such shares, together with any shares acquired hereafter, the
"CORNERSTONE COMMON SHARES") as more particularly described on SCHEDULE 1;

                  WHEREAS, in accordance with the Recitals in the Merger
Agreement, PGGM desires to execute and deliver this Agreement solely in its
capacity as a holder of Cornerstone Common Shares; and

                  WHEREAS, to induce PGGM to enter into this Agreement, EOP, EOP
Partnership and WCP desire to make certain undertakings and agreements as set
forth herein.

                  NOW, THEREFORE, in consideration of the foregoing and for
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows:

SECTION 1.        DISPOSITION OF CORNERSTONE COMMON SHARES

                  During the period from the date hereof through the earlier of
(i) the date on which the Merger is consummated or (ii) 30 days after the date
on which


                                     Page 8 of 24

<PAGE>

the Merger Agreement is terminated according to its terms (such period
hereinafter referred to as the "TERM"), PGGM shall not, directly or indirectly,
(a) sell, transfer, pledge, encumber, assign or otherwise dispose of, or enter
into any contract, option or other agreement or understanding with respect to
the sale, transfer, pledge, encumbrance, assignment or other disposition of, any
Cornerstone Common Shares, (b) grant any proxies for any Cornerstone Common
Shares with respect to any matters described in Section 2(a) hereof (other than
a proxy directing the holder thereof to vote the Cornerstone Common Shares in a
manner required by Section 2(a) hereof), (c) deposit any Cornerstone Common
Shares into a voting trust or enter into a voting agreement with respect to any
Cornerstone Common Shares with respect to any matters described in Section 2(a)
hereof, or tender any Cornerstone Common Shares in a transaction other than a
transaction contemplated by the Merger Agreement, or (d) take any action which
is intended to have the effect of preventing or disabling PGGM from performing
its obligations under this Agreement; PROVIDED, HOWEVER, that nothing herein
shall prevent the sale, transfer, pledge, encumbrance, assignment or other
disposition of any of such Cornerstone Common Shares, provided that the
purchaser, transferee, pledgee or assignee thereof agrees in writing to be bound
by the terms of this Agreement.

SECTION 2.        VOTING

                  (a) During the Term, PGGM shall cast or cause to be cast all
votes attributable to the Cornerstone Common Shares, at any annual or special
meeting of shareholders of Cornerstone, including any adjournments or
postponements thereof, or in connection with any written consent or other vote
of Cornerstone shareholders, (i) in favor of adoption of the Merger Agreement
and approval of the Merger and the other transactions contemplated by the Merger
Agreement (including any amendments or modifications of the terms of the Merger
Agreement approved by the board of directors of Cornerstone that would not
materially adversely affect PGGM in its capacity as beneficial owner of
Cornerstone Common Stock), and (ii) against approval or adoption of any action
or agreement (other than the Merger Agreement or the transactions contemplated
thereby) made or taken in opposition to or in competition with the Merger or the
Partnership Merger.

                  (b) PGGM will retain the right to vote its Cornerstone Common
Shares, in its sole discretion, on all matters other than those described in
paragraph (a) of this Section 2, and PGGM may grant proxies and enter into
voting agreements or voting trusts for its Cornerstone Common Shares in respect
of such other matters.

SECTION 3.        NON-SOLICITATION

                  During the Term, PGGM (a) shall not, and shall not permit any
of its officers, directors, employees, Affiliates, agents, investment bankers,
financial advisors, attorneys, accountants, brokers, finders or other
representatives retained

                                     Page 9 of 24

<PAGE>

by it to, (i) invite, initiate, solicit or encourage, directly or indirectly,
any inquiries, proposals, discussions or negotiations or the making or
implementation of any Acquisition Proposal, or (ii) engage in any discussions or
negotiations with or provide any confidential or non-public information or data
to, any person relating to an Acquisition Proposal, or otherwise facilitate any
effort or attempt to make or implement an Acquisition Proposal; and (b) shall
notify EOP immediately if it receives any such inquiries or proposals, or any
requests for such information, or if any such negotiations or discussions are
sought to be initiated or continued with PGGM.

SECTION 4.        TAX MATTERS

                  (a) So long as there is no change in Section 1445 of the
Internal Revenue Code of 1986, as amended (the "Code"), the Treasury Regulations
promulgated thereunder, or the published interpretations of the Internal Revenue
Service with respect thereto occurring after the date hereof (a "Change in
Law"), EOP shall not withhold, and shall not cause to be withheld, any tax
pursuant to Section 1445 of the Code in respect of the Merger Consideration to
be paid to PGGM pursuant to the Merger. In the event that EOP believes that a
Change in Law has occurred, it shall deliver written notice thereof to PGGM. In
the event that PGGM shall deliver to EOP an opinion of nationally recognized tax
counsel reasonably satisfactory to EOP to the effect that, taking into account
the Change in Law, EOP is not required to withhold any amount of federal tax
with respect to any portion of the Merger Consideration payable to PGGM under
the Merger Agreement, then the obligation of EOP set forth in the first sentence
of this subparagraph (a) shall continue in effect.

                  (b) (i) EOP shall designate distributions paid by EOP to its
shareholders that have a record date during 2000 prior to the Closing Date as
"capital gain dividends" (as defined in Section 857(b)((3)(C)) of the Code) in
an amount equal to the lesser of (A) the distributions paid by EOP to its
shareholders that have a record date during 2000 prior to the Closing Date
(reduced by any amount designated by EOP pursuant to Section 858(a) of the Code
and the Treasury Regulations thereunder as being paid during 1999), or (B) the
amount of gain that is recognized by EOP during the period commencing on January
1, 2000 and ending on the date prior to the Closing Date with respect to the
disposition of "United States real property interests" (as defined for purposes
of Section 897 of the Code) and that is otherwise eligible for designation as a
"capital gain dividend" under Section 857(b)(3)(C) of the Code, and (ii) it
shall cause the Form 1099s to be delivered to PGGM and the other EOP
shareholders with respect to the year 2000 to be prepared in a manner consistent
with the foregoing designation; PROVIDED, HOWEVER, that EOP makes no
representation or warranty to PGGM that the aforesaid designation will be
respected for federal income tax purposes and that EOP in no event shall have
any liability to PGGM by reason of a recharacterization by the Internal Revenue
Service of distributions paid by EOP to PGGM during or


                                   Page 10 of 24

<PAGE>

with respect to 2000 as "capital gain dividends" or as otherwise including
income attributable to the disposition of "United States real property
interests." EOP also agrees not to withhold from amounts otherwise distributable
to PGGM any tax pursuant to Section 1445 attributable to "capital gains
dividends" (within the meaning of Section 857(b)(3)(C) of the Code) distributed
by EOP to its shareholders in 1999.

                  (c) Upon request from PGGM made from time to time (but not
more frequently than once each calendar quarter), EOP shall endeavor to deliver
to PGGM within fifteen (15) business days after the request therefor a statement
(based upon reasonable inquiry) to the effect that, to the knowledge of EOP, EOP
qualifies as a "domestically controlled REIT" (within the meaning of Section
897(h)(4)(B) of the Code) if such statement in fact would be true when made. For
purposes of such statement, reasonable inquiry shall include review of all
Schedule 13D and 13G filings made under the Exchange Act with the SEC with
respect to EOP during the lesser of the five calendar years preceding the date
of the statement or the period commencing July 1, 1997, all IRS Form 1042
filings made by or on behalf of EOP with respect to each of the five taxable
years preceding the date of the statement (or if shorter, the period commencing
July 1, 1997), the list of EOP's registered shareholders as of a date within 60
days of such statement (and to the extent reasonably available, as of a date
within 60 days of the end of each of the preceding five calendar years (or if
shorter, each of the calendar years commencing with 1997)), a report obtained by
EOP from a shareholders tracking service within 60 days of such statement (and
any similar reports in the possession of EOP or otherwise reasonably available
to EOP providing information as of a date within 60 days of the end of each of
the five preceding calendar years (or if shorter, each of the calendar years
commencing with 1997)), and a list of "non-objecting beneficial owners" of
shares of EOP obtained as of a date within 60 days of such statement (and to the
extent reasonably available, as of a date within 60 days of the end of each of
the preceding five calendar years (or if shorter, each of the calendar years
commencing with 1997)). Such statement shall be accompanied by copies of the
information that has been obtained or relied upon by EOP for purposes of such
statement, PROVIDED THAT PGGM shall have executed an agreement with EOP to treat
such information as confidential and to use such information solely for the
purposes of evaluating the accuracy of such statement. In the event that EOP
should determine in good faith that it cannot provide to PGGM the requested
statement for any reason, EOP shall notify PGGM of such conclusion and the facts
that cause it to be unable to render such statement. In addition to, and without
limiting, the foregoing, in the event that the General Counsel of EOP shall have
actual knowledge that more than 40 percent, by fair market value, of the
outstanding equity interests of EOP are owned directly or indirectly by "foreign
persons" (as that term is used for purposes of Section 897(h)(4)(B) of the
Code), EOP shall provide written notice thereof (together with a summary of the
relevant facts) to PGGM, PROVIDED THAT the only duty of inquiry of EOP shall be
as set forth in the first sentence of this subparagraph (c).


                                   Page 11 of 24

<PAGE>

                  (d) In the event that EOP shall make any distributions to PGGM
that it concludes in good faith would be subject to withholding of tax pursuant
to the last sentence of Section 1445(e)(3) of the Code and any Treasury
Regulations promulgated with respect thereto, EOP shall provide such reasonable
cooperation as PGGM may request in applying to the Internal Revenue Service for
a "withholding certificate" that would reduce or eliminate the requirement for
such withholding; PROVIDED, HOWEVER, that PGGM shall be responsible for the
preparation and submission of the application for such withholding certificate
and that EOP shall not be precluded from withholding such tax unless and until a
"withholding certificate" is obtained (in which event EOP would not withhold tax
that, under the express terms of the "withholding certificate," is not required
to be withheld). In addition, in the event that PGGM shall provide to EOP an
opinion of nationally recognized tax counsel reasonably satisfactory to EOP to
the effect that EOP is not required pursuant to Section 1445(e)(3) of the Code
and any Treasury Regulations promulgated with respect thereto to withhold any
amount of federal tax with respect to any portion a distribution to PGGM, EOP
shall not withhold any such tax unless it shall conclude in good faith that a
Change in Law has occurred after the date of such opinion, in which event EOP
shall provide written notice thereof to PGGM. Thereafter, the preceding sentence
would not apply unless PGGM delivers an opinion of nationally recognized tax
counsel reasonably satisfactory to EOP reconfirming the original opinion, after
taking into account the Change in Law.

                  (e) The obligations of EOP set forth in subparagraphs (c) and
(d) shall terminate at such time as PGGM owns less than the lesser of (i) one
percent (1%) of the issued and outstanding EOP Common Shares or (ii) the number
of EOP Common Shares issued to PGGM in the Merger.

                  (f) PGGM agrees that, effective as of the Effective Time of
the Merger, all agreements and undertakings previously entered into by
Cornerstone or any Cornerstone Subsidiary with respect to tax matters,
including, without limitation, agreements restricting the sale or other
disposition of one or more assets owned by Cornerstone, Cornerstone Partnership,
or any Subsidiary of either Cornerstone or Cornerstone Partnership shall
terminate for events or transactions occurring after the Effective Time of the
Merger, and that neither EOP, EOP Partnership nor any Subsidiaries of either EOP
or EOP Partnership shall have any obligation or liability thereunder for events
or transactions occurring following the Effective Time of the Merger. Without
limiting the foregoing, such termination shall include the agreements of
Cornerstone and Cornerstone Partnership set forth in the letter dated June 22,
1998 from Cornerstone and Cornerstone Partnership to PGGM, the undertakings with
respect to tax matters set forth in the Amended and Restated Registration Rights
and Voting Agreement dated as of December 16, 1998 by and among Cornerstone,
PGGM, and Dutch Institutional Holding Company, Inc. (THE "REGISTRATION RIGHTS
AGREEMENT"), and the policy of Cornerstone with


                                   Page 12 of 24

<PAGE>

respect to One Norwest Center, Denver, Colorado (and any properties acquired in
exchange therefor) adopted by its Board of Directors at a meeting on August 13,
1997.

SECTION 5.        CONSENT TO TRANSFER

                  To the extent required by any mortgage, pledge, security
agreement, deed of trust or other agreement or instrument entered into by
Cornerstone or any of its Affiliates with or for the benefit of PGGM, including,
without limitation, the agreements listed in item 5 on EXHIBIT A attached hereto
(collectively, the "INSTRUMENTS"), PGGM agrees and acknowledges that, subject to
and effective as of the Effective Time of the Merger, without any further action
by Cornerstone, EOP, PGGM or any other party thereto or beneficiary thereof,
PGGM hereby consents to the transfer to EOP and its Affiliates as a result of
the Mergers and other transactions contemplated by the Merger Agreement of the
beneficial ownership interest of any of the Affiliates of Cornerstone who are a
party to the Instruments and to each other matter thereunder with respect to
which PGGM's consent is required in connection with the Mergers and other
transactions contemplated by the Merger Agreement.

SECTION 6.        REGISTRATION RIGHTS AGREEMENT

                  PGGM and EOP hereby agree and acknowledge that, subject to and
effective as of the Effective Time of the Merger, without any further action by
Cornerstone, EOP or PGGM, EOP and PGGM shall be bound by the Registration Rights
Agreement as the same is amended as follows:

(a) From and after the Effective Time of the Merger, (i) all references in the
Registration Rights Agreement to the "Company" shall be deemed to be references
to EOP; (ii) all references therein to DIHC shall be deleted; (iii) the
references to "that together own 25% or more of the issued and outstanding
Common Stock" in Sections 1.2(iii) and 1.2(iv) shall be deleted; (iv) all
references therein to "Common Stock" shall refer to the EOP Common Shares, (v)
the "Initial Percentage" shall mean 12% of the issued and outstanding Common
Stock; (vi) the "Standstill Period" shall mean, with respect to any Holder, a
period of time commencing on the Effective Time of the Merger and terminating
ninety (90) days after the first date following the election of PGGM's designees
to EOP's Board of Trustees that no Trustee designated by PGGM pursuant to
Section 7 of this Voting Agreement remains a Trustee of EOP; and (vii) all
references therein to "Units" shall refer to EOP OP Units.

                  (b) Section 2 shall be deleted in its entirety and all
references to Section 2 in the Registration Rights Agreement shall be deleted.


                                   Page 13 of 24

<PAGE>

                  (c) Section 3.1(a) shall be amended to delete the reference to
the specified Cornerstone Registration Statement and to cause the first line to
read as follows: "Within 20 days after the request of PGGM following the
Effective Time of the Merger."

                  (d) Section 7 shall be deleted in its entirety and all
references to Section 7 in the Registration Rights Agreement shall be deleted.

                  (e) Section 8 shall be amended as follows: (i) the reference
to "that together with its Affiliates owns 25% or more of the issued and
outstanding shares of Common Stock" in Section 8 shall be deleted, and (ii) the
reference to "Section 78.140 of the Nevada General Corporation Law" shall refer
to Section 2-419 of the Maryland General Corporation Law.

                  (f) Section 9 shall be amended as follows: (i) deleting "and"
after the end of clause (I), (ii) adding "and" after the end of clause (II), and
(iii) adding a new clause (III) as follows: "(III) by the Company in connection
with a Business Combination to which the Company is a party."

                  (g) Section 11 shall be amended to refer to the address of EOP
set forth in the Merger Agreement.

                  (h) Sections 12 and 13 shall be deleted.

SECTION 7.        TRUSTEES

                  The trustees of EOP following the Merger shall consist of the
trustees of EOP immediately prior to the Effective Time of the Merger, who shall
continue to serve for the balance of their unexpired terms or their earlier
death, resignation or removal, together with John S. Moody, William Wilson III
and Jan van der Vlist, each of whom shall, no later than the third business day
after the Effective Time of the Merger, become a trustee with terms expiring in
2002, 2003 and 2003, respectively. Upon the expiration of the terms of Mr. van
der Vlist in 2003 and 2006, so long as PGGM and its Affiliates continue to own
in the aggregate 21,000,000 (as adjusted for stock splits, reverse stock splits,
stock dividends and similar actions) or more of the issued and outstanding EOP
Common Shares at all times up to the meeting of shareholders at which trustees
are being elected in such years, EOP shall take all action necessary to nominate
Mr. van der Vlist for re-election as a trustee of EOP for an additional
three-year term at any special or annual meeting of shareholders at which
trustees are being elected (or in connection with a written consent in lieu of a
meeting pursuant to which trustees are proposed to be elected). In the event
that Mr. Van der Vlist shall fail to stand for re-election as aforesaid for any
reason in either 2003 or 2006 or in the event of his earlier death or
resignation, and so long as PGGM and its Affiliates continue to own in the
aggregate 21,000,000 (as adjusted for stock splits,


                                   Page 14 of 24

<PAGE>

reverse stock splits, stock dividends and similar actions) or more of the issued
and outstanding EOP Common Shares at such time, EOP shall take all action
necessary to nominate a replacement designated by PGGM, which replacement shall
be subject to the approval of EOP if such replacement is not an officer,
director or employee of PGGM, for election or re-election as a trustee of EOP
for an additional three-year term at any special or annual meeting of
shareholders at which trustees are being elected (or in connection with a
written consent in lieu of a meeting pursuant to which trustees are proposed to
be elected) or, in the case of a vacancy, at a meeting of the Board of Trustees
called for such purpose. Except as expressly provided above in this Section 7,
following their election as trustees, such persons shall serve for their
designated terms, subject to their earlier death, resignation or removal.

SECTION 8.        CERTAIN AGREEMENTS

                  PGGM represents and warrants to EOP, EOP Partnership and WCP
that (a) the only pending claims asserted against PGGM or Robert T. Sorrentino,
Craig W. Johnston or Barrington H. Branch (the "Individuals") under the
Indemnity Agreement, dated as of October 27, 1997, as thereafter amended, among
DIHC Holding Company, Inc., PGGM and Cornerstone (the "Indemnity Agreement") or
any of the agreements listed in items 1, 2, 3 and 4 on EXHIBIT A attached hereto
(collectively, the "Purchase Agreements") are (i) the Western Litigation (as
defined in the Indemnity Agreement) and (ii) the Massachusetts state tax claim
previously disclosed to EOP in writing (the "Massachusetts Tax Claim"), and (b)
to its knowledge after reasonable inquiry, there is no basis for any further
claim, obligation, or liability of PGGM or any of the Individuals under the
Indemnity Agreement or any of the Purchase Agreements. EOP, EOP Partnership and
WCP hereby agree and acknowledge that, subject to and effective as of the
Effective Time of the Merger, without any further action by EOP, EOP
Partnership, WCP or PGGM, PGGM and the Individuals shall be released and
discharged from any and all claims, obligations or liabilities under the
Indemnity Agreement and the Purchase Agreements, including, without limitation,
with respect to or in connection with the Massachusetts Tax Claim (collectively,
the "Released Claims"), EXCEPT for (x) any claims, obligations or liabilities
with respect to or in connection with the Western Litigation and (y) any claims,
obligations or liabilities a basis for which PGGM has or would have had
knowledge after reasonable inquiry as of the Effective Time (collectively (x)
and (y) being referred to as the "Excluded Claims"). From and after the
Effective Time, EOP and EOP Partnership shall indemnify, defend and hold
harmless PGGM from and against any and all cost, claim, liability, damage or
expense (including, without limitation, reasonable attorneys' fees) with respect
to or in connection with the Released Claims and PGGM and the Individuals shall
be obligated under the Indemnity Agreement and the Purchase Agreements to EOP
and EOP Partnership with respect to or in connection with the Excluded Claims.


                                   Page 15 of 24

<PAGE>

SECTION 9.        REPRESENTATIONS AND WARRANTIES OF PGGM

                  PGGM represents and warrants to EOP and EOP Partnership as
follows:

                  (a) PGGM has the legal capacity, power, authority and right
(contractual or otherwise) to execute and deliver this Agreement and to perform
its obligations hereunder. PGGM has obtained all consents of third parties
necessary to enter into this Agreement and to perform its obligations hereunder,
including, without limitation, the amendments to the Registration Rights
Agreement.

                  (b) This Agreement has been duly executed and delivered by
PGGM and constitutes a valid and binding obligation of PGGM enforceable against
PGGM in accordance with its terms, subject to applicable bankruptcy, insolvency,
moratorium or other similar laws relating to creditors rights and general
principles of equity.

                  (c) The execution and delivery of this Agreement and the
consummation of the transactions herein contemplated will not conflict with or
violate any court order, judgment or decree applicable to PGGM, or conflict with
or result in any breach of or constitute a default (or an event which with
notice or lapse of time or both would become a default) under any contract or
agreement to which PGGM is a party or by which PGGM is bound or affected, which
conflict, violation, breach or default would materially and adversely affect
PGGM's ability to perform any of its obligations under this Agreement.

                  (d) Subject to any required filings under the Securities
Exchange Act of 1934 (the " '34 Act"), PGGM is not required to give any notice
or make any report or other filing with any governmental authority in connection
with the execution or delivery of this Agreement or the performance of PGGM's
obligations hereunder and no waiver, consent, approval or authorization of any
governmental or regulatory authority or any other person or entity is required
to be obtained by PGGM for the performance of PGGM's obligations hereunder,
other than where the failure to make such filings, give such notices or obtain
such waivers, consents, approvals or authorizations would not materially and
adversely affect PGGM's ability to perform this Agreement.

                  (e) Cornerstone Common Shares set forth opposite PGGM on
SCHEDULE 1 hereto are the only Cornerstone Common Shares or other Cornerstone or
Cornerstone Partnership securities owned beneficially or of record by PGGM or
over which it exercises voting control.


                                   Page 16 of 24

<PAGE>

SECTION 10.       REPRESENTATIONS AND WARRANTIES OF EOP AND EOP PARTNERSHIP

                  EOP and EOP Partnership represent and warrant to PGGM as
follows:

                  (a) Each of EOP and EOP Partnership has the legal capacity,
power, authority and right (contractual or otherwise) to execute and deliver
this Agreement and to perform its obligations hereunder. Each of EOP and EOP
Partnership has obtained all consents of third parties necessary to enter into
this Agreement and to perform its obligations hereunder.

                  (b) This Agreement has been duly executed and delivered by EOP
and EOP Partnership and constitutes a valid and binding obligation of EOP and
EOP Partnership enforceable against them in accordance with its terms, subject
to applicable bankruptcy, insolvency, moratorium or other similar laws relating
to creditors rights and general principles of equity.

                  (c) The execution and delivery of this Agreement and the
consummation of the transactions herein contemplated will not conflict with or
violate any court order, judgment or decree applicable to EOP or EOP
Partnership, or conflict with or result in any breach of or constitute a default
(or an event which with notice or lapse of time or both would become a default)
under any contract or agreement to which EOP or EOP Partnership is a party or by
which EOP or EOP Partnership is bound or affected, which conflict, violation,
breach or default would materially and adversely affect EOP or EOP Partnership's
ability to perform any of its obligations under this Agreement.

                  (d) Subject to any required filings under the Securities
Exchange Act of 1934 (the " '34 Act"), neither EOP nor EOP Partnership is
required to give any notice or make any report or other filing with any
governmental authority in connection with the execution or delivery of this
Agreement or the performance of its obligations hereunder and no waiver,
consent, approval or authorization of any governmental or regulatory authority
or any other person or entity is required to be obtained by EOP or EOP
Partnership for the performance of its obligations hereunder, other than where
the failure to make such filings, give such notices or obtain such waivers,
consents, approvals or authorizations would not materially and adversely affect
its ability to perform this Agreement.

SECTION 11.       FURTHER ASSURANCES

                  PGGM shall make such filings as may be required from time to
time under the '34 Act. The parties hereto shall, upon request by the other, do,
execute, acknowledge, deliver, record, re-record, file, re-file, register and
re-register any and all such further acts, deeds, conveyances, security
agreements, pledge agreements, mortgages, deeds of trust, trust deeds,
assignments, estoppel certificates, financing


                                   Page 17 of 24

<PAGE>

statements and continuation thereof, termination statements, notices of
assignment, transfers, certificates, assurances and other instruments as the
requesting party reasonably may request from time to time in order to effectuate
the purposes of this Agreement, including, without limitation, to perfect and
maintain the validity, effectiveness and priority of any of the Instruments and
the liens and security interests intended to be created thereby and better to
assure, convey, grant, assign, transfer, preserve, protect and confirm unto PGGM
the rights granted now or hereafter intended to be granted under the
Instruments.

SECTION 12.       DESCRIPTIVE HEADINGS

                  The descriptive headings herein are inserted for convenience
only and are not intended to be part of or to affect the meaning or
interpretation of this Agreement.

SECTION 13.       COUNTERPARTS

                  This Agreement may be executed in counterparts, each of which
when so executed and delivered shall be an original, but all of such
counterparts shall together constitute one and the same instrument.

SECTION 14.       ENTIRE AGREEMENT; ASSIGNMENT

                  This Agreement (i) constitutes the entire agreement and
supersedes all prior agreements and understandings, both written and oral, among
the parties hereto with respect to the subject matter hereof and (ii) shall not
be assigned by operation of law or otherwise; PROVIDED, HOWEVER, following the
Effective Time, this Agreement may be assigned by EOP in the same circumstances
as under the Registration Rights Agreement.

SECTION 15.       NOTICES.

                  All notices, requests, claims, demands and other
communications under this Agreement shall be in writing and shall be delivered
personally, sent by overnight courier (providing proof of delivery) to the
parties or sent by telecopy (providing confirmation of transmission) at the
following addresses or telecopy numbers (or at such other address or telecopy
number for a party as shall be specified by like notice):


                                   Page 18 of 24

<PAGE>

                (a)      if to EOP or EOP Partnership, to:

                                 Equity Office Properties Trust
                                 EOP Operating Limited Partnership
                                 Two N. Riverside Plaza
                                 Chicago, IL  60606
                                 Attention:   President
                                              Chief Counsel
                                 Fax No.:  (312) 559-5021

                         with a copy to:

                                 Hogan & Hartson L.L.P.
                                 555 Thirteenth Street, N.W.
                                 Washington, D.C.  20004-1109
                                 Attention:   J. Warren Gorrell, Jr., Esq.
                                              George P. Barsness, Esq.
                                 Fax No.:  (202) 637-5910

                (b)      if to Cornerstone or Cornerstone Partnership, to:

                                 Tower 56
                                 125 East 56th Street, 6th Floor
                                 New York, NY 10022
                                 Attention: President
                                 Fax No.: (212) 605-7100

                         with a copy to:

                                 King & Spalding
                                 191 Peachtree Street
                                 Atlanta, GA  30303-1763
                                 Attention:   William B. Fryer, Esq.
                                 Fax No.:  (404) 572-5100

                (c)      if to PGGM, to:

                                 Stichting Pensioenfonds voor de Gezondheid,
                                      Geestelijke en Maatschappelijke Belangen
                                 Utrechtseweg 44
                                 3714 HD Zeist
                                 The Netherlands
                                 Attention:  Anneke C. van de Puttelaar

                                 Fax No.:  011 3130 696 3388

                         with a copy to:

                                 Richards & O'Neil, LLP
                                 885 Third Avenue
                                 New York, NY  10022
                                 Attention:  Ann F. Chamberlain, Esq.
                                 Fax No.: (212) 750-9022


                                   Page 19 of 24

<PAGE>

All notices shall be deemed given only when actually received.

SECTION 16.       GOVERNING LAW; CONSENT TO JURISDICTION; WAIVER OF JURY TRIAL

                  (a) This Agreement shall be governed by and construed in
accordance with the laws of the State of Maryland without regard to the
principles of conflicts of laws thereof.

                  (b) PGGM hereby submits and consents to non-exclusive personal
jurisdiction in any action, suit or proceeding arising out of this Agreement or
the transactions contemplated hereby in a federal court located in the State of
Maryland or in a Maryland state court. Any process, summons, notice or document
delivered by mail to the address set forth in Section 15 hereof shall be
effective service of process for any action, suit or proceeding in any Maryland
state court or any federal court located in the State of Maryland with respect
to any matters to which PGGM has submitted to jurisdiction in this Section 16.
PGGM irrevocably and unconditionally waives any objection to the laying of venue
of any action, suit or proceeding arising out of this Agreement or the
transactions contemplated hereby in any Maryland state court or any federal
court located in the State of Maryland, and hereby irrevocably and
unconditionally waives and agrees not to plead or claim in any such court that
any such action, suit or proceeding brought in any such court has been brought
in an inconvenient forum. PGGM IRREVOCABLY WAIVES TRIAL BY JURY IN ANY ACTION,
SUIT OR PROCEEDING WITH RESPECT TO THIS AGREEMENT.

SECTION 17.       SPECIFIC PERFORMANCE

                  The parties hereto agree that if any of the provisions of this
Agreement were not performed in accordance with their specific terms or were
otherwise breached, irreparable damage would occur, no adequate remedy at law
would exist and damages would be difficult to determine, and that the parties
shall be entitled to specific performance of the terms hereof, in addition to
any other remedy at law or equity. Nothing contained herein shall release any
party from any liability


                                   Page 20 of 24

<PAGE>

arising from any breach of any of its representations, warranties, covenants or
agreements in this Agreement.

SECTION 18.       CAPACITY OF PGGM AND ITS OFFICERS, DIRECTORS AND EMPLOYEES.

                  PGGM has executed this Agreement solely in its capacity as a
stockholder of Cornerstone. Without limiting the foregoing, nothing in this
Agreement shall limit or affect any actions taken by any officer, director or
employee of PGGM in his capacity as an officer, director, employee or manager of
Cornerstone in connection with the exercise of Cornerstone's rights under the
Merger Agreement.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.]


                                   Page 21 of 24

<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have duly executed and
delivered this Voting Agreement, or have caused this Voting Agreement to be duly
executed and delivered in their names and on their behalf, as of the date first
written above.

                                    EQUITY OFFICE PROPERTIES TRUST

                                    By:   /s/ Stanley M. Stevens
                                       -----------------------------------------
                                    Name:     Stanley M. Stevens
                                         ---------------------------------------
                                              Executive Vice President
                                    Title:      and Chief Legal Counsel
                                          --------------------------------------

                                    EOP OPERATING LIMITED PARTNERSHIP

                                    By:      Equity Office Properties Trust, its
                                             general partner

                                             By: /s/ Stanley M. Stevens
                                                --------------------------------
                                             Name:   Stanley M. Stevens
                                                  ------------------------------
                                                     Executive Vice President
                                             Title:    and Chief Legal Counsel
                                                   -----------------------------

                                    WCP SERVICES, INC.

                                    By:   /s/ John S. Moody
                                       -----------------------------------------
                                    Name:     John S. Moody
                                         ---------------------------------------
                                    Its:      President
                                        ----------------------------------------

                                    PENSIOENFONDS VOOR DE
                                    GEZONDHEID, GEESTELIJKE EN
                                    MAATSCHAPPELIJKE BELANGEN

                                    By: /s/ Jan H.W.R van der Vlist
                                       -----------------------------------------
                                    Name:   Jan H.W.R van der Vlist
                                         ---------------------------------------
                                    Title:  Attorney-in-Fact
                                          --------------------------------------

                                   Page 22 of 24

<PAGE>

                                                                      SCHEDULE 1
<TABLE>
<CAPTION>

  NAME OF          # OF SHARES
RECORD AND             OF
BENEFICIAL         CORNERSTONE                          TERMS OF
   OWNER             COMMON             PLEDGEE          PLEDGE
                     STOCK


<S>                <C>                 <C>               <C>
PGGM               45,779,703          Not Applicable    Not Applicable

</TABLE>

                                   Page 23 of 24


<PAGE>

                                    EXHIBIT A

1.  Loan Purchase Agreement Between PGGM and Cornerstone, dated as of August 18,
    1997.

2.  Stock Purchase Agreement between Dutch Institutional Holding Company, Inc.
    and Cornerstone, dated as of August 18, 1997.

3.  Stock Purchase Agreement, between Cornerstone and PGGM, dated as of June 22,
    1998.

4.  Stock Purchase Agreement, between PGGM and WCP Services, Inc., dated as of
    December 31, 1998.

5.  Amended and Restated Note and Collateral Agency Agreement between
    Cornerstone Partnership, certain of its Subsidiaries, Cornerstone, Dutch
    Institutional Holding Company, Inc. and PGGM, dated as of January 20, 1998,
    and all other "Loan Documents" as defined therein.


                                   Page 24 of 24

<PAGE>

                                                                Exhibit 99.2(c)

                              AMENDED AND RESTATED
                    REGISTRATION RIGHTS AND VOTING AGREEMENT

                  THIS AMENDED AND RESTATED REGISTRATION RIGHTS AND VOTING
AGREEMENT (this "Agreement"), is made and entered into as of this 16th day of
December, 1998, by and between CORNERSTONE PROPERTIES INC., a Nevada corporation
(the "Company"), DUTCH INSTITUTIONAL HOLDING COMPANY, INC., a Delaware
corporation ("DIHC"), and STICHTING PENSIOENFONDS VOOR DE GEZONDHEID,
GEESTELIJKE EN MAATSCHAPPELIJKE BELANGEN, a stichting formed according to the
laws of The Netherlands ("PGGM").

                              W I T N E S S E T H:

                  WHEREAS, pursuant to the terms of that certain Stock Purchase
Agreement (the "Purchase Agreement"), dated as of August 18, 1997, between the
Company and DIHC, and that certain Loan Purchase Agreement (the "Loan
Agreement") dated as of August 18, 1997, between the Company and PGGM, the
Company acquired certain shares of capital stock, partnership interests and
loans from DIHC and PGGM and issued shares of its Common Stock (as defined
below) to DIHC and PGGM; and

                  WHEREAS, in connection with the Purchase Agreement, the
Company, DIHC and PGGM entered into a Registration Rights and Voting Agreement,
dated as of October 27, 1997 (the "Registration Rights Agreement"), which
provided (i) for the registration under the Securities Act of 1933, as amended,
of certain shares of Common Stock (ii) for the nomination and election of
certain persons to serve on the Board of Directors of the Company, (iii) for
certain restrictions regarding the transfer of shares of Common Stock and (iv)
for certain covenants regarding the operation of the Company's business; and

                  WHEREAS, pursuant to the terms of that certain Stock Purchase
Agreement (the "Stock Purchase Agreement"), dated as of June 22, 1998, as
amended, between the Company and PGGM, the Company is issuing additional shares
of its Common Stock to PGGM; and

                  WHEREAS, in connection with the Stock Purchase Agreement, the
parties desire to amend and restate the Registration Rights Agreement on the
terms set forth herein;

                  NOW, THEREFORE, the parties agree as follows:


<PAGE>

         1.       CERTAIN OTHER DEFINITIONS. Capitalized terms not otherwise
defined herein shall have the meanings ascribed to them in the Purchase
Agreement. The capitalized terms set forth below (in their singular and plural
forms as applicable) shall have the following meanings:

                  1.1      "AFFILIATE" means, with respect to any specified
Person, any other Person that directly, or indirectly through one or more
intermediaries, controls, is controlled by, or is under common control with,
such specified Person.

                  1.2      "BUSINESS COMBINATION" means any one of the following
transactions:

                  (i)      Any merger or consolidation of the Company or any
         subsidiary thereof with any other Person (other than the Company);

                  (ii)     Any sale, lease, exchange, mortgage, pledge, transfer
         or other disposition by the Company (in one transaction or a series of
         transactions) to or with any Person of all or a substantial portion of
         the assets of the Company and its subsidiaries taken as a whole;

                  (iii)    The adoption of any plan or proposal for the
         liquidation or dissolution of the Company proposed by or on behalf of
         any Holder or its Affiliates that together own 25% or more of the
         issued and outstanding Common Stock; or

                  (iv)     Any reclassification of securities (including any
         reverse stock split), recapitalization of the Company, or any merger
         or consolidation of the Company with any subsidiary thereof or any
         other transaction to which the Company is a party which has the
         effect, directly or indirectly, of increasing the Holder Interest of
         such Holder or its Affiliates that together own 25% or more of the
         issued and outstanding Common Stock (whether or not with or into or
         otherwise involving such Holder or any of its Affiliates).

                  1.3      "CLOSING DATE" has the meaning specified in Section
2.04 of the Purchase Agreement.

                  1.4      "COMMISSION" shall mean the United States Securities
and Exchange Commission and any successor federal agency having similar powers.

                  1.5      "COMMON STOCK" shall mean the common stock without
par value of the Company.

                  1.6      "CONTROL" (including the terms "CONTROLLED BY" and
"UNDER COMMON CONTROL WITH"), with respect to the relationship between or among
two or more Persons, means the possession, directly or indirectly or as trustee,
personal representative or executor, of the power to direct or cause the
direction of the affairs or management of a


<PAGE>

Person, whether through the ownership of voting securities, as trustee, personal
representative or executor, by contract or otherwise, including, without
limitation, the ownership, directly or indirectly, of securities having the
power to elect a majority of the board of directors or similar body governing
the affairs of such Person.

                  1.7      "CURRENT MARKET PRICE" of each share of Common Stock
shall mean (i) the average of the closing prices of the Common Stock for the
five New York Stock Exchange trading days immediately preceding the day in
question as reported by THE WALL STREET JOURNAL under the New York Stock
Exchange Composite Transactions quotation system (or under any successor
quotation system) or, if the Common Stock is no longer traded on the New York
Stock Exchange under the quotation system under which such closing prices are
reported or, if THE WALL STREET JOURNAL no longer reports such closing prices,
such closing prices as reported by a newspaper or trade journal selected by the
Company or (ii) if no such closing prices are available on such dates, the fair
market value as determined in good faith by the Board of Directors of the
Company.

                  1.8      "DEMAND OFFERING" shall mean a offering required to
be effected pursuant to Section 3.3 hereof.

                  1.9      "DEMAND PROSPECTUS" shall mean the prospectus
included in the Shelf Registration Statement, including any preliminary
prospectus, and any amendment or supplement thereto, including any supplement
relating to the terms of the offering of any portion of the Demand Offering
Securities covered by the Demand Prospectus, and in each case including all
material incorporated by reference therein.

                  1.10     "DEMAND OFFERING SECURITIES" shall mean the Shares
held by DIHC and PGGM or any subsequent Holder to whom this Agreement has, or
rights to cause the Company to register Shares in accordance with Section 3
have, been assigned pursuant to Section 9, excluding (i) Shares that have been
disposed of under the Shelf Registration Statement or any other effective
registration statement, (ii) Shares sold or otherwise transferred pursuant to
Rule 144 under the Securities Act, and (iii) those Shares held by any single
Holder if such Holder holds less than 1% of the issued and outstanding shares of
Common Stock and all of such Shares are eligible for sale pursuant to Rule 144
under the Securities Act and all of such Holder's Shares could be sold by such
Holder in a single transaction under Rule 144 under the Securities Act.

                  1.11     "DEMAND OFFERING EXPENSES" shall mean any and all
expenses incurred by the Company in connection with Demand Offerings, including,
without limitation: (i) all Commission, stock exchange and National Association
of Securities Dealers, Inc. ("NASD") registration and filing fees, (ii) all fees
and expenses incurred in connection with compliance with state securities or
"blue sky" laws (including reasonable fees and disbursements of counsel in
connection with qualification of any of the Demand Offering Securities under any
state securities or blue sky laws and the preparation of a blue sky memorandum)
and compliance with the rules of the NASD, (iii) all expenses of any Persons in
preparing or assisting in preparing, word processing,


<PAGE>

printing and distributing any Demand Prospectus, certificates and other
documents relating to the performance of and compliance with this Agreement,
(iv) all fees and expenses incurred in connection with the listing, if any, of
any of the Demand Offering Securities on any U.S. securities exchange or
exchanges, and (v) the fees and disbursements of counsel for the Company and of
the independent public accountants of the Company, including the expenses of any
special audits or "cold comfort" letters required by or incident to such
performance and compliance. Demand Offering Expenses shall specifically exclude
Selling Expenses and the fees and expenses of counsel representing the Holders,
all of which shall be borne by the Holders in all cases.

                  1.12     "DEMAND OFFERING REQUEST" shall have the meaning set
forth in Section 3.3(a) hereof.

                  1.13     "DIHC" shall have the meaning set forth in the
Preamble.

                  1.14     "ENCUMBRANCE" means any security interest, pledge,
mortgage, lien (including, without limitation, environmental and tax liens),
charge, encumbrance, adverse claim, preferential arrangement, or restriction of
any kind, including, without limitation, any restriction on the use, voting,
transfer, receipt of income or other exercise of any attributes of ownership.

                  1.15     "EQUITY SECURITY" means any (i) Common Stock, (ii)
securities of the Company convertible into or exchangeable for Common Stock, and
(iii) options, rights, warrants and similar securities issued by the Company to
acquire Common Stock.

                  1.16     "EXCHANGE ACT" shall mean the Securities Exchange Act
of 1934, as amended from time to time.

                  1.17     "HOLDER" shall mean DIHC and PGGM (and their
respective transferees of Shares as permitted by this Agreement to whom this
Agreement has, or rights to cause the Company to register Shares in accordance
with Section 3 have, been assigned pursuant to Section 9).

                  1.18     "HOLDER INTEREST" means, with respect to any Holder,
the percentage of issued and outstanding Common Stock represented by the shares
of Common Stock owned by such Holder and its Affiliates; PROVIDED, HOWEVER, that
shares of Common Stock indirectly owned through an intermediary (i) of which
such Holder owns less than 1% of the issued and outstanding common shares or
(ii) in connection with which Holder has no right to direct the vote of shares
of the Company shall not be included in the Holder Interest of such Holder.

                  1.19     "INDEBTEDNESS" means, with respect to any Person, (a)
all indebtedness of such Person, whether or not contingent, for borrowed money,
(b) all obligations of such Person for the deferred purchase price of property
or services, (c) all obligations of such Person evidenced by notes, bonds,
debentures or other similar instruments, (d) all indebtedness created or arising
under any conditional sale or other


<PAGE>

title retention agreement with respect to property acquired by such Person (even
though the rights and remedies of the seller or lender under such agreement in
the event of default are limited to repossession or sale of such property), (e)
all obligations of such Person as lessee under leases that have been or should
be, in accordance with U.S. GAAP, recorded as capital leases, (f) all
obligations, contingent or otherwise, of such Person under acceptance, letter of
credit or similar facilities, (g) all obligations of such Person to purchase,
redeem, retire, defease or otherwise acquire for value any capital stock of such
Person or any warrants, rights or options to acquire such capital stock, valued,
in the case of redeemable preferred stock, at the greater of its voluntary or
involuntary liquidation preference plus accrued and unpaid dividends, (h) the
greater of (i) the principal amount and (ii) the redemption value of any
perpetual preferred stock issued by such Person, (i) all Indebtedness of others
referred to in clauses (a) through (f) above guaranteed directly or indirectly
in any manner by such Person, or in effect guaranteed directly or indirectly by
such Person through an agreement (i) to pay or purchase such Indebtedness or to
advance or supply funds for the payment or purchase of such Indebtedness, (ii)
to purchase, sell or lease (as lessee or lessor) property, or to purchase or
sell services, primarily for the purpose of enabling the debtor to make payment
of such Indebtedness or to assure the holder of such Indebtedness against loss,
(iii) to supply funds to or in any other manner invest in the debtor (including
any agreement to pay for property or services irrespective of whether such
property is received or such services are rendered) or (iv) otherwise to assure
a creditor against loss, and (j) all Indebtedness referred to in clauses (a)
through (f) above secured by (or for which the holder of such Indebtedness has
an existing right, contingent or otherwise, to be secured by) any Encumbrance on
property (including, without limitation, accounts and contract rights) owned by
such Person, even though such Person has not assumed or become liable for the
payment of such Indebtedness.

                  1.20     "INCUMBENT DIRECTORS" shall mean (i) all of the
individuals constituting the board of directors of the Company on the date
hereof, (ii) all individuals hereafter designated as nominees to the board of
directors by the New York State Teachers' Retirement System pursuant to a letter
agreement dated November 22, 1996, (iii) all individuals hereafter designated as
nominees to the board of directors by Hexalon Real Estate, Inc. pursuant to a
letter agreement dated November 7, 1996, (iv) one individual at any time
hereafter designated by Deutsche Bank AG as a nominee to the board of directors,
and (v) Messrs. William Wilson III, Donald G. Fisher and Randall A. Hack as
nominees to the board of directors pursuant to an agreement dated as of June 22,
1998, as amended.

                  1.21     "INITIAL PERCENTAGE" means the percentage of issued
and outstanding Common Stock represented immediately after the Closing by the
shares issued pursuant to the Purchase Agreement and the Loan Agreement.

                  1.22     "LEVERAGE RATIO" shall mean the ratio of the
Company's Indebtedness to the Company's Total Market Capitalization.


<PAGE>

                  1.23     "MAXIMUM NUMBER" shall having the meaning set forth
in Section 3.3(e) hereof.

                  1.24     "PERMITTED TRANSFEREE" means any (i) mutual fund
company, pension fund, insurance company, investment company, any state, city,
or county, or any agency or instrumentality of a state, city, or county, or any
state university or state college, and any retirement system for the benefit of
employees of any of the foregoing, any religious or educational organization or
other passive institutional investor or (ii) any non-U.S. Person (as defined in
Section 9.02 of the Charter Amendment) that is not controlled by U.S. Persons
(as defined in the Charter Amendment).

                  1.25     "PERSON" means any individual, partnership, firm,
corporation, association, trust, unincorporated organization or other entity, as
well as any syndicate or group that would be deemed to be a person under Section
13(d)(3) of the Exchange Act.

                  1.26     "PGGM" shall have the meaning set forth in the
Preamble.

                  1.27     "PIGGYBACK REGISTRATION" shall have the meaning set
forth in Section 3.6(a) hereof.

                  1.28     "PIGGYBACK REGISTRATION REQUEST" shall have the
meaning set forth in Section 3.6(a) hereof.

                  1.29     "PUBLIC OFFERING" means a public offering of Common
Stock pursuant an effective registration statement under the Securities Act.

                  1.30     The terms "REGISTER", "REGISTERED" and "REGISTRATION"
refer to a registration effected by preparing and filing a registration
statement in compliance with the Securities Act and the declaration or ordering
of the effectiveness of such registration statement by the Commission.

                  1.31     "SECURITIES ACT" means the Securities Act of 1933, as
amended.

                  1.32     "SELLING EXPENSES" shall mean all underwriting
discounts and selling commissions and transfer taxes applicable to the sale of
Shelf Registrable Securities or Demand Offering Securities and disbursements of
underwriters.

                  1.33     "SHARES" shall mean (a) the shares of Common Stock
issued pursuant to the Purchase Agreement, the Loan Agreement and the Stock
Purchase Agreement and (b) shares of Common Stock or any other securities which
are hereafter issued with respect to the shares referred to in Section 1.33(a)
by way of conversion, exchange, reclassification, dividend or distribution,
whether or not such securities have been offered and sold to the public.


<PAGE>

                  1.34     "SHELF PROSPECTUS" shall mean the prospectus included
in the Shelf Registration Statement, including any preliminary prospectus, and
any amendment or supplement thereto, including any supplement relating to the
terms of the offering of any portion of the Shelf Registrable Securities covered
by the Shelf Registration Statement, and in each case including all material
incorporated by reference therein.

                  1.35     "SHELF REGISTRATION" shall mean the registration
required to be effected pursuant to Section 3.1 hereof.

                  1.36     "SHELF REGISTRABLE SECURITIES" shall mean the Shares
held by DIHC and PGGM or any subsequent Holder to whom this Agreement has, or
rights to cause the Company to register Shares in accordance with Section 3
have, been assigned pursuant to Section 9, excluding (i) Shares that have been
disposed of under the Shelf Registration Statement or any other effective
registration statement, (ii) Shares sold or otherwise transferred pursuant to
Rule 144 under the Securities Act, and (iii) those Shares held by any single
Holder if such Holder holds less than 1% of the issued and outstanding shares of
Common Stock and all of such Shares are eligible for sale pursuant to Rule 144
under the Securities Act and all of such Holder's Shares could be sold by such
Holder in a single transaction under Rule 144 under the Securities Act.

                  1.37     "SHELF REGISTRATION EXPENSES" shall mean any and all
expenses incident to performance of or compliance with this Agreement,
including, without limitation: (i) all Commission, stock exchange and NASD
registration and filing fees, (ii) all fees and expenses incurred in connection
with compliance with state securities or "blue sky" laws (including reasonable
fees and disbursements of counsel in connection with qualification of any of the
Shelf Registrable Securities under any state securities or blue sky laws and the
preparation of a blue sky memorandum) and compliance with the rules of the NASD,
(iii) all expenses of any Persons in preparing or assisting in preparing, word
processing, printing and distributing the Shelf Registration Statement, any
Shelf Prospectus, certificates and other documents relating to the performance
of and compliance with this Agreement, (iv) all fees and expenses incurred in
connection with the listing, if any, of any of the Shelf Registrable Securities
on any securities exchange or exchanges, and (v) the fees and disbursements of
counsel for the Company and of the independent public accountants of the
Company, including the expenses of any special audits or "cold comfort" letters
required by or incident to such performance and compliance. Shelf Registration
Expenses shall specifically exclude Selling Expenses and the fees and
disbursements of counsel representing the Holders, all of which shall be borne
by the Holders in all cases.

                  1.38     "SHELF REGISTRATION NOTICE" shall have the meaning
set forth in Section 3.2(b) hereof.

                  1.39     "SHELF REGISTRATION STATEMENT" shall mean each
registration statement of the Company (and any other entity required to be a
registrant with respect to such registration statement pursuant to the
requirements of the Securities Act) that covers all of the Shelf Registrable
Securities to be offered on a delayed or continuous


<PAGE>

basis pursuant to Rule 415 under the Securities Act, or any similar rule that
may be adopted by the Commission, and all amendments (including post-effective
amendments) to such registration statement, and all exhibits thereto and
materials incorporated by reference therein.

                  1.40     "STANDSTILL PERIOD" means, with respect to any
Holder, a period of time commencing on the Closing Date and terminating on
October 27, 2000 (the date three years after the Closing Date).

                  1.41     "TOTAL MARKET CAPITALIZATION" shall mean the sum of
(i) the Company's total Indebtedness, plus (ii) the product of (x) the number of
issued and outstanding shares of Common Stock, PLUS the number of shares of
Common Stock issuable upon conversion of issued and outstanding preferred stock
(other than convertible preferred stock subject to redemption at the option of
the holder) and issued and outstanding Units TIMES (y) the Current Market Price.

                  1.42     "U.S. GAAP" means United States generally accepted
accounting principles and practices in effect from time to time applied
consistently throughout the periods involved.

                  1.43     "UNITS" means units of limited partnership in
Cornerstone Properties Limited Partnership, a Delaware limited partnership.

         2.       RESTRICTIONS ON TRANSFER.

                  2.1      REPRESENTATIONS AND WARRANTIES OF PGGM. (a) PGGM and
DIHC hereby represent, acknowledge, covenant and agree as follows: (i) the
Shares are being acquired for PGGM's and DIHC's own account for investment and
not with a view to any distribution or public offering within the meaning of the
Securities Act or any state securities law; (ii) the Shares have not been
registered under the Securities Act or any state securities law; (iii) PGGM and
DIHC is each an "accredited investor" within the meaning of Rule 501 promulgated
by the Commission pursuant to the Securities Act; (iv) PGGM and DIHC have been
furnished with all information that PGGM or DIHC has requested for purposes of
evaluating the Company and each has had an opportunity to ask questions of and
receive answers from the Company regarding its business, assets, results of
operations, and financial condition; and (v) PGGM and DIHC will not sell or
otherwise transfer any of the Shares except upon the terms and conditions
specified herein.

                  2.2      LEGENDS. Except as provided in Section 2.4, each
certificate representing the Shares issued to PGGM and DIHC or transferred to a
subsequent Holder pursuant to Section 2.3 shall include, in addition to the
legends relating to provisions of the Company's articles of incorporation,
legends in substantially the following form, PROVIDED that the first such legend
shall not be required if such transfer is being made in connection with a sale
that is (i) pursuant to a Public Offering or (ii) exempt from registration
pursuant to Rule 144 under the Securities Act or if the


<PAGE>

opinion of counsel referred to in Section 2.3 is to the further effect that such
legend is not required in order to ensure compliance with the Securities Act;
PROVIDED FURTHER, that the second such legend shall not be required if Sections
7.6 and 8 hereof do not apply to such subsequent Holder:

                  THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
                  REGISTERED UNDER THE SECURITIES ACT OF 1933 OR ANY STATE
                  SECURITIES ACT AND MAY NOT BE SOLD OR TRANSFERRED IN THE
                  ABSENCE OF SUCH REGISTRATION OR AN EXEMPTION THEREFROM.

                  SUCH SHARES MAY BE TRANSFERRED ONLY IN COMPLIANCE WITH THE
                  CONDITIONS SPECIFIED IN THE AMENDED AND RESTATED REGISTRATION
                  RIGHTS AND VOTING AGREEMENT DATED AS OF DECEMBER 16, 1998,
                  AMONG THE ISSUER AND THE OTHER PARTY(IES) NAMED THEREIN, A
                  COMPLETE AND CORRECT COPY OF WHICH IS AVAILABLE FOR INSPECTION
                  AT THE PRINCIPAL OFFICE OF THE ISSUER AND WILL BE FURNISHED TO
                  THE HOLDER HEREOF UPON WRITTEN REQUEST AND WITHOUT CHARGE.

                  2.3      NOTICE OF TRANSFER. Prior to any proposed assignment,
transfer or sale of any Shares, the Holder of such Shares shall give written
notice to the Company of Holder's intention to effect such assignment, transfer
or sale, which notice shall set forth the date of such proposed assignment,
transfer or sale. Holder shall also furnish to the Company a written agreement
by the transferee that it is taking and holding the same subject to the terms
and conditions specified in this Agreement and, except in transfers pursuant to
a Public Offering or under Rule 144 or Regulation S under the Securities Act, a
written opinion of Holder's counsel, in form reasonably satisfactory to the
Company, to the effect that the proposed transfer may be effected without
registration under the Securities Act.

                  2.4      TERMINATION OF RESTRICTIONS. The restrictions set
forth in this Section 2 shall terminate and cease to be effective with respect
to any of the Shares (i) upon the sale of any such Shares which has been
registered under the Securities Act or is made pursuant to Rule 144 under the
Securities Act or (ii) upon receipt by the Company of an opinion of counsel,
which counsel and which opinion are reasonably satisfactory to the Company, to
the effect that compliance with such restrictions is not necessary in order to
comply with the Securities Act with respect to the sale of the Shares. The
restrictions with respect to a Holder set forth in Sections 7.5 and 8 hereof
shall terminate upon the end of the Standstill Period. Whenever such
restrictions shall so terminate, the Holder of such Shares shall be entitled to
receive from the Company,


<PAGE>

without expense (other than transfer taxes, if any), certificates for such
Shares not bearing the respective legends set forth in Section 2.2.

         3.       REGISTRATION UNDER SECURITIES ACT.

                  3.1      SHELF REGISTRATION.

                  (a)      Within 20 days after the date hereof and upon the
request of PGGM, the Company will use its commercially reasonable efforts to
cause to be filed a Shelf Registration Statement, which, in accordance with Rule
429 under the Securities Act, shall include a form of Shelf Prospectus for use
with respect to the Shelf Registrable Securities included in the Registration
Statement on Form S-3 (Registration No. 333-47149) filed by the Company with the
Commission on March 2, 1997, providing for the sale by the Holders of all of the
Shelf Registrable Securities in accordance with the terms hereof and will use
its commercially reasonable efforts to cause such Shelf Registration Statement
to be declared effective by the Commission as soon as practicable thereafter.
The Company agrees to use its commercially reasonable efforts to keep the Shelf
Registration Statement with respect to the Shelf Registrable Securities
continuously effective so long as Holder holds Shelf Registrable Securities.
Subject to Section 3.2(b) and Section 3.2(i), the Company further agrees to
amend the Shelf Registration Statement if and as required by the rules,
regulations or instructions applicable to the registration form used by the
Company for such Shelf Registration Statement or by the Securities Act or any
rules and regulations thereunder; PROVIDED, HOWEVER, that the Company shall not
be deemed to have used its commercially reasonable efforts to keep the Shelf
Registration Statement effective during the applicable period if it voluntarily
takes any action that would result in the Holders not being able to sell Shelf
Registrable Securities covered thereby during that period, unless such action is
required under applicable law or the Company has filed a post-effective
amendment to the Shelf Registration Statement and the Commission has not
declared it effective or except as otherwise permitted by the last six sentences
of Section 3.2(b). The Holders will provide information reasonably requested by
the Company in connection with the Shelf Registration Statement as promptly as
practicable after receipt of such request. The "Plan of Distribution" section of
the Shelf Registration Statement shall permit negotiated purchases, secondary
distributions, block trades, ordinary brokerage transactions or a combination of
such methods of sale, PROVIDED, HOWEVER, that the Company's obligations under
Sections 3.1 and 3.2 hereof shall not include participation in underwritten
offerings or other organized distributions of securities, which obligations are
limited to registrations under Section 3.3 and 3.6 hereof.

                  (b)      EXPENSES. The Company shall pay all Shelf
Registration Expenses in connection with the registration pursuant to Section
3.1(a). The Holders shall pay all Selling Expenses and the fees and
disbursements of counsel representing the Holders, relating to the sale or
disposition of such Shelf Registrable Securities pursuant to the Shelf
Registration Statement.


<PAGE>

                  3.2 SHELF REGISTRATION PROCEDURES. In connection with the
obligations of the Company with respect to the Shelf Registration Statement
contemplated by Section 3.1 hereof, the Company shall:

                  (a)      prepare and file with the Commission, within the time
period set forth in Section 3.1(a) hereof, the Shelf Registration Statement,
which Shelf Registration Statement shall comply as to form in all material
respects with the requirements of the applicable form and include all financial
statements required by the Commission to be filed therewith;

                  (b)      subject to the last six sentences of this Section
3.2(b) and Section 3.2(i) hereof, (i) prepare and file with the Commission such
amendments to such Shelf Registration Statement as may be necessary to keep such
Shelf Registration Statement effective throughout the applicable period; (ii)
cause the Shelf Prospectus to be amended or supplemented as required and to be
filed as required by Rule 424 or any similar rule that may be adopted under the
Securities Act; and (iii) respond as promptly as practicable to any comments
received from the Commission with respect to the Shelf Registration Statement or
any amendment thereto. Notwithstanding anything to the contrary contained
herein, the Company shall not be required to take any of the actions described
in clauses (i), (ii) or (iii) in this Section 3.2(b), Section 3.2(d) or Section
3.2(i) with respect to the Shelf Registrable Securities (x) to the extent that
(I) in the reasonable opinion of the Company (A) securities laws applicable to
such sale would require the Company to disclose material non-public information
("Non-Public Information") and (B) the disclosure of such Non-Public Information
would materially adversely affect the Company; (ii) such sale would occur during
the measurement period for determining the amount of Common Stock, or the amount
of any other consideration the amount of which will be based on the price of the
Common Stock, in connection with the acquisition of a business or assets by the
Company (a "Measurement Period"); OR (iii) the Company is contemplating an
underwritten Public Offering of its securities and in the reasonable opinion of
the underwriters such sale would interfere materially with such Public Offering
by the Company (a "Financing Period"); and the Company delivers written notice
to the Holders to the effect that the Holders may not make offers or sales under
the Shelf Registration Statement for a period not to exceed 45 days from the
date of such notice; PROVIDED, HOWEVER, that the Company may deliver only four
such notices under this Section 3.2(b) and Section 3.4(a) within any
twelve-month period, PROVIDED, FURTHER, that the Company may deliver only two
such notices under this Section 3.2(b) and Section 3.4(a) within the
twelve-month period immediately following the expiration of the six-month period
referred to in Section 3.3(f)(i) hereof and (y) unless and until the Company has
received a written notice (a "Shelf Registration Notice") from any Holder that
such Holder intends to make offers or sales under the Shelf Registration
Statement as specified in such Shelf Registration Notice; PROVIDED, HOWEVER,
that the Company shall have ten business days to prepare and file any such
amendment or supplement after receipt of the Shelf Registration Notice. The
Measurement Period and Financing Period are collectively referred to herein as
the "Restricted Period." In the event the sale by the Holders of Shelf
Registrable Securities is deferred because of the existence of Non-Public


<PAGE>

Information, the Company will notify the Holders promptly upon such Non-Public
Information being included by the Company in a filing with the Commission, being
otherwise disclosed to the public (other than through the actions of any
Holder), or ceasing to be material to the Company, and upon such notice being
given by the Company, the Holders shall again be entitled to sell Shelf
Registrable Securities as provided herein. In the event the sale by the Holders
of Shelf Registrable Securities is deferred because it is proposed to be made
during a Restricted Period, the Company shall specify, in notifying the Holders
of the deferral of its sale, when the Restricted Period will end, at which time
the Holders shall again be entitled to sell Shelf Registrable Securities as
provided herein. If the Restricted Period is thereafter changed, the Company
will promptly notify the Holders of such change and upon the end of the
Restricted Period as so changed, the Holders will again be entitled to sell
Shelf Registrable Securities as provided herein. If an agreement to which such
Restricted Period relates is terminated prior to the end of the Restricted
Period, the deferral period hereunder shall end immediately and the Company
shall promptly notify the Holders of the end of the deferral period;

                  (c)      promptly furnish the Holders after a Holder has
delivered a Shelf Registration Notice to the Company, without charge, as many
copies of each Shelf Prospectus and any amendment or supplement thereto in order
to facilitate the public sale or other disposition of the Shelf Registrable
Securities; the Company consents to the use of the Shelf Prospectus and any
amendment or supplement thereto by the Holders of Shelf Registrable Securities
in connection with the offering and sale of the Shelf Registrable Securities
covered by the Shelf Prospectus or amendment or supplement thereto;

                  (d)      use its commercially reasonable efforts to register
or qualify the Shelf Registrable Securities by the time the Shelf Registration
Statement is declared effective by the Commission under all applicable state
securities or blue sky laws of such jurisdictions in the United States and its
territories and possessions as the Holders shall reasonably request in writing,
keep each such registration or qualification effective during the period such
Shelf Registration Statement is required to be kept effective or during the
period offers or sales are being made by the Holders after a Holder has
delivered a Shelf Registration Notice to the Company, whichever is shorter;
PROVIDED, HOWEVER, that in connection therewith, the Company shall not be
required to (i) qualify as a foreign corporation to do business or to register
as a broker or dealer in any such jurisdiction where it would not otherwise be
required to qualify or register but for this Section 3.2(d), (ii) subject itself
to taxation in any such jurisdiction, or (iii) file a general consent to service
of process in any such jurisdiction;

                  (e)      notify the Holders promptly and, if requested by a
Holder, confirm in writing, (i) when the Shelf Registration Statement and any
post-effective amendments thereto have become effective, (ii) when any amendment
or supplement to the Shelf Prospectus has been filed with the Commission, (iii)
of the issuance by the Commission or any state securities authority of any stop
order suspending the effectiveness of the Shelf Registration Statement or any
part thereof or the initiation of any proceedings for


<PAGE>

that purpose, (iv) if the Company receives any notification with respect to the
suspension of the qualification of the Shelf Registrable Securities for offer or
sale in any jurisdiction or the initiation of any proceeding for such purpose,
and (v) of the happening of any event during the period the Shelf Registration
Statement is effective as a result of which (A) such Shelf Registration
Statement contains any untrue statement of a material fact or omits to state any
material fact required to be stated therein or necessary to make the statements
therein not misleading or (B) the Shelf Prospectus as then amended or
supplemented contains any untrue statement of a material fact or omits to state
any material fact necessary in order to make the statements therein, in light of
the circumstances under which they were made, not misleading;

                  (f)      use its reasonable best efforts to obtain the
withdrawal of any order suspending the effectiveness of the Shelf Registration
Statement or any part thereof as promptly as possible;

                  (g)      promptly furnish to the Holders after a Holder has
delivered a Shelf Registration Notice to the Company, without charge, at least
one conformed copy of the Shelf Registration Statement and any post-effective
amendment thereto (without documents incorporated therein by reference or
exhibits thereto, unless requested);

                  (h)      cooperate with the Holders to facilitate the timely
preparation and delivery of certificates representing Shelf Registrable
Securities to be sold and not bearing any Securities Act legend; and enable
certificates for such Shelf Registrable Securities to be issued for such numbers
of shares as the Holders may reasonably request at least two business days prior
to any sale of Shelf Registrable Securities;

                  (i)      subject to the last six sentences of Section 3.2(b)
hereof, upon the occurrence of any event contemplated by clause (v) of Section
3.2(e) hereof, use its reasonable best efforts promptly to prepare and file an
amendment or a supplement to the Shelf Prospectus or any document incorporated
therein by reference or prepare, file and obtain effectiveness of a
post-effective amendment to the Shelf Registration Statement, or file any other
required document, in any such case to the extent necessary so that, as
thereafter delivered to the purchasers of the Shelf Registrable Securities, such
Shelf Prospectus as then amended or supplemented will not contain any untrue
statement of a material fact or omit to state any material fact necessary in
order to make the statements therein, in the light of the circumstances under
which they are made, not misleading;

                  (j)      make available for inspection by the Holders after a
Holder has provided a Shelf Registration Notice to the Company and any counsel,
accountants or other representatives retained by the Holders all financial and
other records, material corporate documents and properties of the Company and
cause the officers, directors and employees of the Company to supply all such
material records, documents or information reasonably requested by the Holders,
counsel, accountants or representatives in connection with the Shelf
Registration Statement; PROVIDED, HOWEVER, that such records, documents or
information which the Company determines in good


<PAGE>

faith to be confidential and notifies the Holders, counsel, accountants or
representatives in writing that such records, documents or information are
confidential shall not be disclosed by the Holders, counsel, accountants or
representatives unless (i) such disclosure is ordered pursuant to a subpoena or
other order from a court of competent jurisdiction, or (ii) such records,
documents or information become generally available to the public other than
through a breach of this Agreement;

                  (k)      a reasonable time prior to the filing of the Shelf
Registration Statement or any amendment thereto, or any Shelf Prospectus or any
amendment or supplement thereto, provide copies of such document (not including
any documents incorporated by reference therein unless requested) to the
Holders; and

                  (l)      use its reasonable best efforts to cause all Shelf
Registrable Securities to be listed on the New York Stock Exchange from and
after the time the Shelf Registration Statement is declared effective.

                  The Company may require the Holders to furnish to the Company
in writing such information regarding the proposed distribution by the Holders
as the Company may from time to time reasonably request in writing.

                  In connection with and as a condition to the Company's
obligations with respect to the Shelf Registration Statement pursuant to Section
3.1 hereof and this Section 3.2, the Holders covenant and agree that (i) they
will not offer or sell any Shelf Registrable Securities under the Shelf
Registration Statement until a Holder has provided a Shelf Registration Notice
pursuant to Section 3.2(b) and have received copies of the Shelf Prospectus as
then amended or supplemented as contemplated by Section 3.2(c) and notice from
the Company that the Shelf Registration Statement and any post-effective
amendments thereto have become effective as contemplated by Section 3.2(e); (ii)
upon receipt of any notice from the Company contemplated by Section 3.2(b) or
Section 3.2(e) (in respect of the occurrence of an event contemplated therein),
the Holders shall not offer or sell any Shelf Registrable Securities pursuant to
the Shelf Registration Statement until the Holders receive copies of the
supplemented or amended Shelf Prospectus contemplated by Section 3.2(i) hereof
and receive notice that any post-effective amendment has become effective, and,
if so directed by the Company, the Holders will deliver to the Company (at the
expense of the Company) all copies in its possession, other than permanent file
copies then in the Holders' possession, of the Shelf Prospectus as amended or
supplemented at the time of receipt of such notice; (iii) upon the expiration of
60 days after the first date on which offers or sales can be made pursuant to
clause (i) above, the Holders will not offer or sell any Shelf Registrable
Securities under the Shelf Registration Statement until they have again complied
with the provisions of clause (i) above; (iv) each Holder and any of such
Holder's partners, officers, directors or Affiliates, if any, will comply with
the provisions of Regulation M under the Exchange Act as applicable to them in
connection with sales of Shelf Registrable Securities pursuant to the Shelf
Registration Statement; (v) each Holder and any of such Holder's partners,
officers, directors or Affiliates, if any, will comply with the prospectus
delivery requirements of the Securities Act as applicable to


<PAGE>

them in connection with sales of Shelf Registrable Securities pursuant to the
Shelf Registration Statement; and (vi) each Holder and any of such Holder's
partners, officers, directors or Affiliates, if any, will enter into such
written agreements as the Company shall reasonably request to ensure compliance
with clauses (iv) and (v) above.

                  3.3      DEMAND OFFERINGS.

                  (a)      REQUESTS FOR DEMAND OFFERING. PGGM, DIHC or a Holder
or Holders owning a majority of the Demand Offering Securities (the "Demand
Initiating Holder") may request the offering under the Securities Act of all or
any portion of the Demand Offering Securities held by such Holders for sale in
the manner specified in such request, including an underwritten offering. Upon
receipt of such request, the Company will promptly, but in any event within 20
days, give written notice of such requested registration to all Holders of
Demand Offering Securities, and thereupon, in accordance with Section 3.4
hereof, the Company will use its reasonable best efforts to effect the
registration and sale of:

                  (i)      the Demand Offering Securities which the Company has
         been so requested to register by such Demand Initiating Holder;

                  (ii)     all other Demand Offering Securities which the
         Company has been requested to register by the other Holders thereof by
         written request delivered to the Company within 15 days after the
         giving of such written notice by the Company, and

                  (iii)    all shares of Common Stock which the Company may
         elect to register for its own account or for the account of others in
         connection with the offering of Demand Offering Securities pursuant to
         this Section 3.3.

                  Each initial request for a offering pursuant to this Section
3.3 shall specify the number of Demand Offering Securities requested to be sold
by the Demand Initiating Holder, the method of disposition to be employed and
the Current Market Price of the Common Stock as of the date of such request. Any
request for an offering pursuant to this Section 3.3(a) shall be referred to
herein as a "Demand Offering Request" and all registrations requested pursuant
to this Section 3.3 are referred to herein as "Demand Offerings."

                  (b)      NUMBER OF DEMAND OFFERINGS. The Company shall not be
required under this Section 3.3 to effect more than eight Demand Offerings in
the aggregate. Notwithstanding anything to the contrary contained herein, if
such method of disposition is a firm commitment underwritten public offering, a
registration shall count as a Demand Offering only when all such Demand Offering
Securities shall have been sold pursuant thereto; PROVIDED, HOWEVER, that if a
Demand Prospectus filed by the Company pursuant to a Demand Offering Request
shall be abandoned or withdrawn at the behest of the Demand Initiating Holder,
then, unless the Holders shall, promptly upon receipt of


<PAGE>

a request by the Company therefor supported by an invoice setting forth the
expenses in reasonable detail, reimburse the Company for the Demand Offering
Expenses in respect of such prospectus attributable to the Holders, the Company
shall be deemed to have effected a Demand Offering.

                  (c)      MINIMUM OFFERING AMOUNT. The Company shall not be
required to comply with this Section 3.3 unless the aggregate Current Market
Price of all Demand Offering Securities covered by the Demand Offering Request
and the Demand Offering Securities described in Section 3.3(a)(ii) shall be $75
million or more (unless and to the extent the Demand Initiating Holder shall
hold less than $75 million of Demand Offering Securities, in which case such
minimum offering amount shall be equal to the amount of Demand Offering
Securities so held).

                  (d)      SELECTION OF UNDERWRITERS. If the method of
disposition specified by the Demand Initiating Holder shall be an underwritten
public offering, the Company may designate the managing underwriter of such
offering, subject to the approval of the Demand Initiating Holder which approval
shall not be unreasonably withheld.

                  (e)      PRIORITY ON DEMAND OFFERINGS. The Company shall be
entitled to include in any offering referred to in this Section 3.3, for sale in
accordance with the method of disposition specified by the Demand Initiating
Holder shares of Common Stock to be sold by the Company for its own account or
by other shareholders of the Company for their account. Nonetheless, whether or
not the Company desires to include any such additional shares in a Demand
Offering, if the managing underwriters advise the Company in writing that in
their opinion the number of securities requested to be included in such offering
exceeds the maximum number which can be included in such offering without
adversely affecting the marketability of the offering (the "Maximum Number"),
then the Company will limit the number of shares included in such offering to
the Maximum Number, and the shares offered shall be selected in the following
order of priority: (i) first, Demand Offering Securities covered by the Demand
Offering Request and the Demand Offering Securities described in Section
3.3(a)(ii), subject to the proviso set forth in clause (iii) below, (ii) second,
securities the Company proposes to sell and (iii) third, securities requested to
be included in such registration pursuant to (A) the Stockholders' Agreement,
dated as of November 22, 1996, by and among the Company and the New York State
Teachers' Retirement System, (B) the Stockholders' Agreement, dated as of
November 7, 1996, by and between the Company and Hexalon Real Estate, Inc., and
(C) the Registration Rights and Lockup Agreement, dated as of ______, 1998, by
and among the Company and the parties named therein (the "Wilson Registration
Rights Agreement") pro rata among the holders thereof on the basis of the number
of shares requested to be included in such registration; PROVIDED that the
securities requested to be included pursuant to clauses (A) and (B) shall not be
reduced to less than one-third of the total number of shares in such offering,
and (iv) fourth, other securities requested to be included in such registration.

                  (f)      EXCEPTION. Anything in this Section 3.3 to the
contrary notwithstanding, the Company shall not be required to file a Demand
Prospectus in


<PAGE>

connection with a Demand Offering (i) within twelve months after the closing
date of a Demand Offering or within six months after the effective date of any
registration statement (other than pursuant to Section 3.1 or a registration
statement on Form S-8 with respect to an employee benefit plan or a registration
statement on Form S-4 relating to securities to be issued in a merger or in
exchange for securities or assets of another Person) of the Company or (ii) if
counsel for the Company, reasonably acceptable to the Demand Initiating Holder
shall deliver an opinion to the Holders to the effect that, pursuant to Rule 144
under the Securities Act or otherwise, the Holders can publicly offer and sell
the Demand Offering Securities as to which sale has been requested without
registration under the Securities Act.

                  3.4      DEMAND OFFERING PROCEDURES. If and whenever the
Company is required by the provisions of Section 3.3 hereof to use its
reasonable best efforts to effect the sale of any of the Demand Offering
Securities under the Securities Act, the Company shall use its reasonable best
efforts to effect the registration and sale of the Demand Offering Securities in
accordance with the intended method of disposition thereof and will, as
expeditiously as possible:

                  (a)      within 45 days after receiving a request for a Demand
Offering, prepare and file with the Commission a Demand Prospectus as a
supplement to the Shelf Registration Statement with respect to such Demand
Offering Securities. Notwithstanding anything to the contrary contained herein,
the filing of such Demand Prospectus may be delayed for a period not to exceed
45 days if (i) any of the events specified in clause (x)(iii) of Section 3.2(b)
hereof shall have occurred, or (ii) the Company is engaged in any program for
the repurchase of Common Stock or other securities of the Company and the
Company provides written notice to the Demand Initiating Holder; PROVIDED,
HOWEVER, that the Company may deliver only four notices under this Section
3.4(a) and 3.2(b) hereof within any twelve-month period; PROVIDED, FURTHER, that
the Company may deliver only two such notices under this Section 3.4(a) and
Section 3.2(b) within the twelve-month period immediately following the
expiration of the six-month period referred to in Section 3.3(f)(i) hereof.

                  (b)      prior to the filing described in paragraph (a) above,
furnish to the Holders copies of the Demand Prospectus and any amendments or
supplements thereto, which documents shall be subject to the approval of the
Holders only with respect to any statement in the Demand Prospectus which
relates to the Holders;

                  (c)      notify the Holders promptly and, if requested by the
Holders, confirm in writing, (i) when the Demand Prospectus has been filed with
the Commission, (ii) when any amendment or supplement to the Demand Prospectus
has been filed with the Commission, (iii) of the issuance by the Commission or
any state securities authority of any stop order suspending the effectiveness of
the Shelf Registration Statement or any part thereof or the initiation of any
proceedings for that purpose, (iv) if the Company receives any notification with
respect to the suspension of the qualification of the Demand Offering Securities
for offer or sale in any jurisdiction or the initiation of any proceeding for
such purpose, and (v) of the happening of any event during the


<PAGE>

period of the offering pursuant to the Demand Prospectus as a result of which
(A) such Shelf Registration Statement contains any untrue statement of a
material fact or omits to state any material fact required to be stated therein
or necessary to make the statements therein not misleading or (B) the Demand
Prospectus as then amended or supplemented contains any untrue statement of a
material fact or omits to state any material fact necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading;

                  (d)      make every reasonable effort to obtain the withdrawal
of any order suspending the effectiveness of the Shelf Registration Statement or
any part thereof as promptly as possible;

                  (e)      furnish to the Holders after delivery of a Demand
Offering Request to the Company, without charge, at least one conformed copy of
the Shelf Registration Statement and any post-effective amendment thereto
(without documents incorporated therein by reference or exhibits thereto, unless
requested);

                  (f)      prepare and file with the Commission such amendments
and supplements to such Shelf Registration Statement and the Demand Prospectus
used in connection therewith as may be necessary and comply with the provisions
of the Securities Act with respect to the disposition of all Demand Offering
Securities covered by such Demand Prospectus in accordance with the Holders'
intended method of disposition set forth in such Demand Prospectus for such
period;

                  (g)      furnish to the Holders and to each underwriter such
number of copies of the Shelf Registration Statement and the Demand Prospectus
included therein (including each preliminary prospectus) and such other
documents, as such persons may reasonably request in order to facilitate the
public sale or other disposition of the Demand Offering Securities covered by
such Demand Prospectus;

                  (h)      use its reasonable best efforts to register or
qualify the Demand Offering Securities covered by such Demand Prospectus under
the securities or blue sky laws of such jurisdictions as the Holders or, in the
case of an underwritten public offering, the managing underwriter, shall
reasonably request;

                  (i)      provide a transfer agent and registrar, which may be
a single entity, for all Demand Offering Securities;

                  (j)      use its reasonable best efforts to cause all Demand
Offering Securities to be listed on the New York Stock Exchange;

                  (k)      furnish on the date that Demand Offering Securities
are delivered to the underwriters for sale pursuant to such registration: (i) an
opinion dated such date of counsel representing the Company for the purposes of
such registration, addressed to the underwriters, stating that the Shelf
Registration Statement has become effective under the Securities Act and that
(A) to the best knowledge of such counsel, no stop


<PAGE>

order suspending the effectiveness thereof has been issued and no proceedings
for that purpose have been instituted or are pending or contemplated under the
Securities Act, (B) the Shelf Registration Statement, the related Demand
Prospectus, and each amendment or supplement thereto, comply as to form in all
material respects with the requirements of the Securities Act and the applicable
rules and regulations of the Commission thereunder and that such counsel does
not believe that any such Shelf Registration Statement, Demand Prospectus,
amendment or supplement contains a misstatement of a material fact or an
omission to state a material fact required to be stated therein or necessary to
make the statements made therein, in light of the circumstances under which they
were made, not misleading (except that such counsel need express no opinion as
to financial statements or financial or statistical data contained therein) and
(C) to such other effects as may reasonably be requested by counsel for the
underwriters or by the Holders or their counsel, and (ii) a "cold comfort"
letter dated such date from the independent public accountants retained by the
Company, addressed to the underwriters, stating that they are independent public
accountants within the meaning of the Securities Act and that, in the opinion of
such accountants, the financial statements of the Company included in the Shelf
Registration Statement or the Demand Prospectus, or any amendment or supplement
thereto, comply as to form in all material respects with the applicable
accounting requirements of the Securities Act, and such letter shall
additionally cover such other financial matters (including information as to the
period ending no more than five business days prior to the date of such letter)
with respect to the registration in respect of which such letter is being given
as such underwriters may reasonably request; and

                  (l)      make available for inspection by the Holders after
the Demand Initiating Holder has provided a Demand Offering Request to the
Company and any counsel, accountants or other representatives retained by the
Holders all financial and other material records, pertinent corporate documents
and properties of the Company and cause the officers, directors and employees of
the Company to supply all such material records, documents or information
reasonably requested by the Holders, counsel, accountants or representatives in
connection with the Demand Prospectus; PROVIDED, HOWEVER, that such records,
documents or information which the Company determines in good faith to be
confidential and notifies the Holders, counsel, accountants or representatives
in writing that such records, documents or information are confidential shall
not be disclosed by Holders, counsel, accountants or representatives unless (i)
such disclosure is ordered pursuant to a subpoena or other order from a court of
competent jurisdiction, or (ii) such records, documents or information become
generally available to the public other than through a breach of this Agreement.

For purposes of paragraphs (a) and (f) of this Section 3.4, the period of
distribution of Demand Offering Securities in a firm commitment underwritten
public offering shall be deemed to be that period during which the underwriters
in such offering require in an underwriting agreement in the form customarily
used by such underwriters for comparable transactions that the Company keep a
registration statement effective to permit each underwriter to complete the
distribution of all securities purchased by it, and


<PAGE>

the period of distribution of Demand Offering Securities in any other
registration shall be deemed to extend until the earlier of the sale of all
Demand Offering Securities covered thereby or nine months after the effective
date thereof.

                  In connection with each registration hereunder, each Holder
will furnish to the Company in writing such information with respect to
itself and the proposed distribution by itself as shall be reasonably
necessary in order to assure compliance with federal and applicable state
securities laws. Reasonable compliance with the obligation to furnish such
information shall be a condition to the rights afforded such Holder
hereunder. In addition, each Holder and any of its partners, officers,
directors or Affiliates, if any, (i) will comply with the provisions of
Regulation M as applicable to them in connection with sales of Demand
Offering Securities pursuant to the Demand Prospectus; (ii)will comply with
the prospectus delivery requirements of the Securities Act as applicable to
them in connection with sales of Demand Offering Securities pursuant to the
Demand Prospectus; and (iii) will enter into such written agreements as the
Company shall reasonably request to ensure compliance therewith.

                  In connection with each registration pursuant to Section 3.3
hereof covering an underwritten public offering, the Company agrees to enter
into a written agreement with the managing underwriter selected in the manner
herein provided in such form and containing such provisions as are customary in
the securities business for such an arrangement between major underwriters and
companies of the Company's size and investment stature; PROVIDED that such
agreement shall not contain any such provision applicable to the Company which
is inconsistent with the provisions hereof; PROVIDED, FURTHER that the time and
place of the closing under said agreement shall be as mutually agreed upon
between the Company and such managing underwriter.

                  3.5      DEMAND OFFERING EXPENSES. In connection with any
Demand Offering, the Company shall pay all Demand Offering Expenses and the
Holders shall pay all Selling Expenses applicable to the shares sold by the
Holders.

                  3.6      PIGGYBACK REGISTRATIONS.

                  (a)      RIGHT TO PIGGYBACK. In the event that a Holder is not
permitted to effect sales under the Shelf Registration Statement under Section
3.2(b)(x)(iii) hereof or the Holders are not permitted to effect Demand Offering
due to Section 3.4(a)(i), Holders shall become entitled to the rights of this
Section 3.6. The Company will promptly (but in any event within 30 days) give
written notice to the Holders of its intention to effect such registration and a
description of any underwriting agreement to be entered into with respect
thereto and will include in such registration all Shelf Registrable Securities
or Demand Offering Securities with respect to which the Company has received
written requests for inclusion within 15 days after the receipt of the Company's
notice (a "Piggyback Registration Request"); PROVIDED, HOWEVER, that the Company
shall not be required to include Shelf Registrable Securities or Demand Offering
Securities in the securities to be registered pursuant to a registration
statement on any form which limits the amount of securities which may be
registered by the issuer


<PAGE>

and/or selling security holders if, and to the extent that, such inclusion would
make the use of such form unavailable. In the event that any Piggyback
Registration shall be, in whole or in part, an underwritten public offering of
Common Stock, the Holders shall agree that such Demand Offering Securities or
Shelf Registrable Securities are to be included in the underwriting on the same
terms and conditions as the shares of Common Stock otherwise being sold through
underwriters under such registration.

                  (b)      PRIORITY ON PRIMARY REGISTRATIONS. If a Piggyback
Registration is an underwritten primary registration on behalf of the Company,
and the managing underwriters advise the Company in writing that in their
opinion the number of shares requested to be included in such registration
exceeds the Maximum Number, the Company will limit the number of shares included
in such registration to the Maximum Number, and the shares registered shall be
selected in the following order of priority: (i) first, securities the Company
proposes to sell, subject to the proviso set forth in clause (ii) below, (ii)
second, (A) Shelf Registrable Securities or Demand Offering Securities covered
by Piggyback Registration Requests, (B) securities requested to be included in
such registration pursuant to the Wilson Registration Rights Agreement, and (C)
securities requested to be included in such registration pursuant to (x) the
Stockholders' Agreement, dated as of November 22, 1996, by and among the Company
and the New York State Teachers' Retirement System and (y) the Stockholders'
Agreement, dated as of November 7, 1996, by and between the Company and Hexalon
Real Estate, Inc., pro rata among the holders thereof on the basis of the number
of shares requested to be included in such registration; PROVIDED that the
securities requested to be included pursuant to clauses (x) and (y) shall not be
reduced to less than one-third of the total number of shares in such offering
and (iii) third, other securities requested to be included in such registration.

                  (c)      PRIORITY ON SECONDARY REGISTRATIONS. If a Piggyback
Registration is an underwritten secondary registration on behalf of holders of
the Company's securities, and the managing underwriters advise the Company in
writing that in their opinion the number of securities requested to be included
in such registration exceeds the Maximum Number, the Company will include in
such registration the shares requested to be included therein by the holders
requesting such registration and the Shelf Registrable Securities and Demand
Offering Securities covered by Piggyback Registration Requests and any other
securities requested to be included in such registration, pro rata among the
holders thereof on the basis of the number of shares requested to be included in
such registration; PROVIDED, HOWEVER, that if the holders requesting
registration are doing so pursuant to demand registration rights of such
holders, such holders' shares shall take priority over any Shelf Registrable
Securities and Demand Offering Securities and any other securities requested to
be included, which shall be included on a pro rata basis, subject to the proviso
set forth in Section 3.6(b)(ii)(C).

                  3.7      INDEMNIFICATION.


<PAGE>

                  (a)      INDEMNIFICATION BY THE COMPANY. To the extent
permitted by law, the Company shall indemnify and hold harmless the seller of
any Shares covered by any registration statement filed pursuant to Section 3,
its directors, trustees and officers, each other person who participates as an
underwriter in the offering or sale of such securities and each other person,
if any, who controls such seller or any such underwriter within the meaning of
the Securities Act against any losses, claims, damages, liabilities or
expenses, joint or several, to which such seller or any such director, trustee
or officer or participating or controlling person may become subject under the
Securities Act or otherwise, insofar as such losses, claims, damages,
liabilities or expenses (or related actions or proceedings) arise out of or are
based upon (x) any untrue statement or alleged untrue statement of any material
fact contained in any registration statement under which such securities were
registered under the Securities Act, any preliminary prospectus, final
prospectus or summary prospectus contained in such registration statement, or
any amendment or supplement to such registration statement, or any document
incorporated by reference in such registration statement, or (y) any omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, and the Company will
reimburse such seller, and each such director, trustee, officer, participating
person and controlling person for any legal or any other expenses reasonably
incurred by them in connection with investigating or defending any such loss,
claim, liability, action or proceeding, PROVIDED that the Company shall not be
liable in any such case (1) to the extent that any such loss, claim, damage,
liability or expense (or action or proceeding in respect thereof) arises out of
or is based upon an untrue statement or alleged untrue statement or omission or
alleged omission made in such registration statement, any such preliminary
prospectus, final prospectus, summary prospectus, amendment or supplement in
reliance upon and in conformity with written information furnished to the
Company through an instrument duly executed by such seller or any such
director, trustee, officer, participating person or controlling person
specifically stating that it is for use in the preparation of such registration
statement or (2) to the extent any amount paid in settlement of any such loss,
claim, damage, liability or action of such settlement is effected without the
written consent of the Company (which consent shall not be unreasonably
withheld). Such indemnity shall remain in full force and effect regardless of
any investigation made by or on behalf of such seller or any such director,
trustee, officer, participating person or controlling person and shall survive
the transfer of such securities by such seller. The Company shall agree to make
provision for contribution relating to such indemnity as shall be reasonably
requested by any seller of Shares or the underwriters.

                  (b)      INDEMNIFICATION BY THE SELLERS. The Company may
require, as a condition to including any Shares in any registration statement
filed pursuant to Section 3, that the Company shall have received an undertaking
satisfactory to it from each prospective seller of such securities, severally
and not jointly, to indemnify and hold harmless (in the same manner and to the
same extent as set forth in Section 3.6(a)) the Company, each director of the
Company, each officer of the Company who shall sign such registration statement
and each other person, if any, who controls the Company within the meaning of
the Securities Act, with respect to any


<PAGE>

untrue statement in or omission from such registration statement, any
preliminary prospectus, final prospectus or summary prospectus included in such
registration statement, or any amendment or supplement to such registration
statement, of a material fact if such statement or omission was made in reliance
upon and in conformity with written information furnished to the Company through
an instrument duly executed by such seller specifically stating that it is for
use in the preparation of such registration statement, preliminary prospectus,
final prospectus, summary prospectus, amendment or supplement. Such indemnity
shall remain in full force and effect regardless of any investigation made by
or on behalf of the Company or any such director, officer or controlling person
and shall survive the transfer of such securities by such seller.

                  (c)      INDEMNIFICATION PROCEDURE. Promptly after receipt by
any party entitled to indemnification pursuant to Section 3.7(a) or 3.7(b) of
this Agreement (an "Indemnified Party") of notice by a third party of any
complaint or the commencement of any action or proceeding with respect to which
indemnification is being sought hereunder, such Indemnified Party shall notify
the party obligated to provide such indemnification (the "Indemnifying Party")
of such complaint or of the commencement of such action or proceeding;
PROVIDED, HOWEVER, that the failure to so notify the Indemnifying Party shall
not relieve the Indemnifying Party from liability for such claim arising
otherwise than under this Agreement, and such failure to so notify the
Indemnifying Party shall relieve the Indemnifying Party from liability which the
Indemnifying Party may have hereunder with respect to such claim if, but only
if, and only to the extent that, such failure to notify the Indemnifying Party
results in the forfeiture by the Indemnifying Party of material rights and
defenses otherwise available to the Indemnifying Party with respect to such
claim. The Indemnifying Party shall have the right, upon written notice to the
Indemnified Party, to assume the defense of such action or proceeding, including
the employment of counsel reasonably satisfactory to the Indemnified Party and
the payment of the fees and disbursements of such counsel. In the event,
however, that the Indemnifying Party declines or fails to assume the defense of
the action or proceeding or to employ counsel reasonably satisfactory to the
Indemnified Party, in either case in a timely manner, then such Indemnified
Party may employ counsel to represent or defend it in any such action or
proceeding and the Indemnifying Party shall pay the reasonable fees and
disbursements of such counsel as incurred; PROVIDED, HOWEVER, that the
Indemnifying Party shall not be required to pay the fees and disbursements of
more than one counsel for all Indemnified Parties in any jurisdiction in any
single action or proceeding. In any action or proceeding with respect to which
indemnification is being sought hereunder, the Indemnified Party or the
Indemnifying Party, whichever is not assuming the defense of such action, shall
have the right to participate in such litigation and to retain its own counsel
at such party's own expense. The Indemnifying Party or the Indemnified Party, as
the case may be, shall at all times use reasonable best efforts to keep the
Indemnifying Party or the Indemnified Party, as the case may be, reasonably
apprised of the status of the defense of any action, the defense of which it is
maintaining and to cooperate in good faith with the Indemnifying Party or the
Indemnified Party, as the case may be, with respect to the defense of any such
action.


<PAGE>

                  No Indemnified Party may settle or compromise any claim or
consent to the entry of any judgment with respect to which indemnification is
being sought hereunder without the prior written consent of the Indemnifying
Party, unless such settlement, compromise or consent includes an unconditional
release of the Indemnifying Party from all liability arising out of such claim.
An Indemnifying Party may not, without the prior written consent of the
Indemnified Party, settle or compromise any claim or consent to the entry of any
judgment with respect to which indemnification is being sought hereunder unless
such settlement, compromise or consent includes an unconditional release of the
Indemnified Party from all liability arising out of such claim and does not
contain any equitable order, judgment or term which in any manner affects,
restrains or interferes with the business of the Indemnified Party or any of
the Indemnified Party's affiliates.

                  In the event an Indemnified Party shall claim a right to
payment pursuant to this Agreement, such Indemnified Party shall send written
notice of such claim to the appropriate Indemnifying Party. Such notice shall
specify the basis for such claim. As promptly as possible after the Indemnified
Party has given such notice, such Indemnified Party and the appropriate
Indemnifying Party shall establish the merits and amount of such claim (by
mutual agreement or otherwise) and, within five business days of the final
determination of the merits and amount of such claim, the Indemnifying Party
shall deliver to the Indemnified Party immediately available funds in an amount
equal to such claim as determined hereunder.

                  If for any reason the indemnification provided for in this
Section 3.7 is unavailable to an Indemnified Party or is insufficient to hold it
harmless as contemplated by this Section 3.7, then the Indemnifying Party shall
contribute to the amount paid or payable by the Indemnified Party as a result of
such loss, claim, damage or liability in such proportion as is appropriate to
reflect the relative fault of the Indemnified Party and the Indemnifying Party,
as well as any other relevant equitable considerations; PROVIDED that in no
event shall the liability of any Holder for such contribution and
indemnification exceed, in the aggregate, the dollar amount of the proceeds
received by such Holder upon the sale of Shares giving rise to such
indemnification and contribution obligations.

                  The obligations of the parties under this Section 3.7 shall be
in addition to any liability which any party may otherwise have to any other
party.

                  3.8      LIMITATIONS ON REGISTRATION RIGHTS OF OTHERS. The
Company represents and warrants that, except pursuant to this Agreement and
pursuant to rights granted pursuant to the agreements set forth on Exhibit A
hereto, it has not granted to any Person the right to request or require the
Company to register any securities issued by the Company.

         4.       RULE 144. The Company shall comply with the requirements of
Rule 144 under the Securities Act, as such Rule may be amended from time to
time (or any similar rule or regulation hereafter adopted by the Commission),
regarding the availability of current public information to the extent required
to enable any Holder of


<PAGE>

Shares to sell Shares without registration under the Securities Act pursuant to
Rule 144 (or any similar rule or regulation). Upon the request of any Holder of
Shares, the Company will deliver to such Holder a written statement as to
whether it has complied with such requirements.

         5.       AMENDMENTS AND WAIVERS. This Agreement may be amended and the
Company may take any action herein prohibited, or omit to perform any act herein
required to be performed by it, only if the Company shall have obtained the
written consent to such amendment, action or omission to act, of the Holder or
Holders of a majority of the Shares (and, in the case of any amendment, action
or omission to act which adversely affects any specific Holder of Shares or a
specific group of Holders of Shares, the written consent of each such Holder or
Holders of a majority of the Shares held by such group). Each Holder of any
Shares at the time shall be bound by any consent authorized by this Section 5.

         6.       NOMINEES FOR BENEFICIAL OWNERS. In the event that any Shares
are held by a nominee for the beneficial owner thereof, the beneficial owner
thereof may, at its election, be treated as the Holder of such Shares for
purposes of any request or other action by any Holder or Holders of Shares
pursuant to this Agreement or any determination of any number or percentage of
shares of Shares held by any Holder or Holders of Shares contemplated by this
Agreement. If the beneficial owner of any Shares so elects, the Company may
require assurances reasonably satisfactory to it of such owner's beneficial
ownership of such Shares.

         7.      COVENANTS OF THE PARTIES.

                  7.1      BOARD OF DIRECTORS.

                  (a)      So long as PGGM and DIHC and their respective
Affiliates own in the aggregate 5% or more of the issued and outstanding shares
of Common Stock, the Company shall take all action necessary to nominate for
election to the board of directors of the Company (the "Board") at any annual or
special meeting of stockholders at which directors are being elected (or in
connection with a written consent in lieu of a meeting pursuant to which
directors are proposed to be elected) two individuals designated by PGGM ("PGGM
Directors").

                  (b)      From the date hereof until the earlier to occur of
(i) the date as of which PGGM and DIHC and their respective Affiliates own in
the aggregate less than 25% of the issued and outstanding shares of Common Stock
or (ii) October 31, 2002:

                  (i)      the Company shall take all action necessary to ensure
         that one PGGM Director is appointed to the board affairs committee of
         the Board (the "Committee").

                  (ii)     All nominees for election as directors of the Company
         by the Board (other than Incumbent Directors and PGGM Directors
         nominated pursuant to


<PAGE>

         Section 7.1(a) who are employees, officers or directors of PGGM or
         DIHC) shall be persons not affiliated with PGGM or DIHC or any of their
         respective Affiliates and shall be made with the unanimous approval of
         the Committee;

                  (iii)    PGGM and DIHC shall vote (or provide written consent
         with respect to) all shares of Common Stock over which it exercises
         voting authority in favor of the persons nominated as PGGM Directors
         pursuant to Section 7.1(a) and all nominees nominated in accordance
         with Section 7.1(b)(ii) and all Incumbent Directors nominated for
         election as directors of the Company by the Board;

                  (iv)     In the event of any vacancy on the Board, whether
         caused by a director's resignation, removal, death or otherwise, the
         Company shall take all action necessary to ensure that the successor
         to the director whose absence from the Board caused such vacancy shall
         be a PGGM Director if the director who caused such vacancy was a PGGM
         Director; and

                  (v)      The Company shall not increase the number of
         directors constituting the full Board without the unanimous approval
         of the Committee.

                  (c)      So long as PGGM and DIHC and their respective
Affiliates own in the aggregate 2.5% or more of the issued and outstanding
shares of Common Stock, the Company shall not without the prior written consent
of PGGM modify the policy of the Company with respect to its interest in One
Norwest Center, Denver, Colorado, adopted at a meeting of the Board on August
13, 1997.

                  (d)      From the date of adoption of the Amended and Restated
Bylaws of the Company in the form attached hereto as Annex A (the "Amended
Bylaws") until the third anniversary of such date:

                  (i)      PGGM and DIHC shall vote (or provide written consent
         with respect to) all shares of Common Stock over which it exercises
         voting authority in favor of the persons nominated as Wilson Directors
         (as defined in the Amended Bylaws) pursuant to Section 3.03(a) of the
         Amended Bylaws and approved by the Committee as set forth in Section
         3.02 of the Amended Bylaws; and

                  (ii)     PGGM and DIHC shall use commercially reasonable
         efforts to cause the PGGM Directors, in considering the nominees
         proposed by Wilson III (or the Wilson III Designee) (as defined in the
         Amended Bylaws) for inclusion in the Board's list of nominees for
         election as director to approve in all cases Wilson III, and in
         considering other persons nominated as Wilson Directors, not to
         unreasonably withhold their approval.

                  7.2      LEVERAGE RATIO. So long as PGGM and DIHC and their
respective Affiliates own in the aggregate 2.5% or more of the issued and
outstanding shares of Common Stock, the Company shall at all times maintain a
Leverage Ratio not in excess of 0.45 to 1; PROVIDED, HOWEVER, that
notwithstanding the foregoing, (i) the Company


<PAGE>

may at any time incur Indebtedness in an amount which does not exceed the
principal amount of outstanding Indebtedness of the Company extended,
refinanced, renewed or replaced with the proceeds thereof, plus any costs
associated with the extension refinancing, renewal or replacement, even if such
incurrence causes the Leverage Ratio to exceed 0.45 to 1, (ii) the Company may
incur Indebtedness if, as of the date on which the Company enters into a binding
commitment with respect to such Indebtedness, the Leverage Ratio including such
Indebtedness did not exceed 0.45 to 1 and (iii) with respect to lines of credit,
the Company may incur Indebtedness under such line, if, as of the date the
Company enters into the line of credit, the Leverage Ratio including the entire
amount of Indebtedness available under such line did not exceed 0.45 to 1.

                  7.3      DOMESTIC REIT STATUS. So long as PGGM and DIHC and
their respective Affiliates own in the aggregate 2.5% or more of the issued and
outstanding shares of Common Stock, the Company shall not issue any Equity
Securities in connection with any Public Offering or other sale to any Non-U.S.
Person (as defined in Section 9.02 of the Charter Amendment), other than in
connection with stock splits or stock dividends or under the Company's dividend
reinvestment plan or stock option or management incentive compensation plans;
PROVIDED, HOWEVER, that the Company, in connection with any Public Offering of
Equity Securities, may issue and sell up to 15% of the securities issued in such
offering to Non-U.S. Persons.

                  7.4      HOLDBACK AGREEMENTS. Each Holder agrees, if so
requested prior to December 31, 1998, by the managing underwriter in any Public
Offering by the Company, not to effect any sale or distribution of Common Stock
(other than as part of such Public Offering) within such periods prior to and
after the effective date of such registration statement as the managing
underwriter may request and as may be required of executive officers and
directors of the Company after the effective date of such registration
statement; PROVIDED that no Holder shall be required to enter into more than one
such agreement. After December 31, 1998, each Holder will consider entering into
such agreements if so requested.

                  7.5      RESTRICTIONS ON TRANSFER. During the Standstill
Period, any Holder and its Affiliates owning 25% or more of the issued and
outstanding shares of Common Stock, shall not assign, transfer or sell any
Shares to any Person or such Person's Affiliates (other than a Permitted
Transferee that agrees in writing to be bound by the provisions of this
Agreement) in any single transaction or series of related transactions if, after
such transaction or transactions, such Person and such Person's Affiliates would
own more than 10% of the then issued and outstanding shares of Common Stock
other than transfers of shares from DIHC to PGGM.

                  7.6      OWNERSHIP LIMIT. The Company has taken and will
continue to take all action necessary to ensure that issuance of the Shares to
DIHC, DIHC Market Square, Inc. and PGGM pursuant to the Purchase Agreement and
the Loan Agreement shall not be deemed a violation of Article 8 of the Company's
articles of incorporation. Whenever PGGM or DIHC (or DIHC Market Square, Inc.)
proposes to transfer any Shares to any Person, in accordance with the provisions
of Section 8.03 of the articles


<PAGE>

of incorporation of the Company, the Board shall determine whether the proposed
transfer would jeopardize the Company's status as a real estate investment trust
(a "REIT") under Section 856 of the Internal Revenue Code of 1986, as amended.
If the Board determines that it would not so jeopardize the Company's REIT
status, or if it receives an opinion of counsel, which counsel and opinion are
reasonably satisfactory to the Board, to the effect that such proposed transfer
will not jeopardize the Company's status as a REIT, the Board shall determine
that such transferee will not be treated as a "Person" within the meaning of
Section 8.03(b) of the Company's articles of incorporation and therefore the
ownership of Shares by such transferee will be exempt from the restrictions
imposed by Article 8 of the Company's articles of incorporation. If the Board
determines that the proposed transfer would jeopardize the Company's REIT
status, the Company shall provide a written explanation to DIHC and PGGM of the
basis for its determination and shall provide reasonable access to information
regarding the Company's shareholders to DIHC and PGGM.

                  7.7      TRANSFERS TO PGGM. The Company shall take all action
necessary to ensure that any transfer of Shares from DIHC or DIHC Market Square,
Inc. to PGGM shall not be deemed a violation of Article 8 or Section 9.01 of the
Company's articles of incorporation.

                  7.8      SHARE REPURCHASES. So long as DIHC and PGGM and their
respective Affiliates own in the aggregate 25% or more of the issued and
outstanding shares of Common Stock, in the event the Company proposes to
repurchase any shares of Common Stock from any holder thereof owning together
with its Affiliates 5% or more of the issued and outstanding shares of Common
Stock, DIHC and PGGM shall have the right to require the Company to repurchase a
number of shares of Common Stock held by DIHC and PGGM equal to the product of
(I) the total number of shares proposed to be repurchased and (II) a fraction,
the numerator of which is (A) the number of Shares owned by DIHC and PGGM and
their respective Affiliates and the denominator of which is (B) the sum of the
number of shares of Common Stock owned by such holder plus the number of Shares
owned by DIHC and PGGM and their respective Affiliates.

                  7.9      AMENDED AND RESTATED BYLAWS. From the date of
adoption of the Amended Bylaws until the third anniversary of such date, PGGM
and DIHC agree not to vote, and to use their commercially reasonable efforts to
cause the PGGM Directors not to vote, to repeal or amend the Amended Bylaws,
where such amendment is covered by Section 10.01(b) of such Amended Bylaws,
unless such amendment is approved by the Wilson Directors (as defined in the
Amended Bylaws).

         8.       STANDSTILL. During the Standstill Period, any Holder that
together with its Affiliates owns 25% or more of the issued and outstanding
shares of Common Stock shall not:

                  (a)      directly or indirectly, purchase or otherwise
acquire, or propose or offer to purchase or otherwise acquire, any Equity
Securities whether by tender offer,


<PAGE>

market purchase, privately negotiated purchase, Business Combination or
otherwise, if, immediately after such purchase or acquisition, the Holder
Interest of such Holder would equal or exceed the Initial Percentage;

                  (b)      directly or indirectly propose to the Company or any
Person a Business Combination;

                  (c)      make, or in any way participate, directly or
indirectly, in any "solicitation" of "proxies" to vote (as such terms are used
in the rules promulgated by the Commission under Section 14(a) of the Exchange
Act) or seek to advise, encourage or influence any person or entity with respect
to the voting of any shares of capital stock of the Company, initiate, propose
or otherwise solicit stockholders of the Company for the approval of one or more
stockholder proposals or induce or attempt to induce any other Person to
initiate any stockholder proposal; or

                  (d)      deposit any Equity Securities into a voting trust or
subject any Equity Securities to any arrangement or agreement with respect to
the voting of such securities or form, join or in any way participate in a
"group" (within the meaning of Section 13(d)(3) of the Exchange Act) with
respect to any Equity Securities, other than as expressly set forth in Section 7
hereof.

         Nothing in this Section 8 shall limit the ability of PGGM Directors to
function in their capacities as members of the Board. The provisions of this
Section 8 may be waived by the Company only upon the approval of a majority of
the Board, excluding all PGGM Directors and shall not be applicable to actions
approved by the majority of the Board, excluding all PGGM Directors in
circumstances in which the PGGM Directors are "interested directors" under
Section 78.140 of the Nevada General Corporation Law.

         9.       ASSIGNMENT. This Agreement shall not be assignable by the
parties hereto, except (I) by PGGM, DIHC or any Holder pursuant to a transfer of
Shares permitted hereunder to a Permitted Transferee that agrees in writing to
be bound by the terms hereof (including, without limitation, Section 7.5 and 8,
if applicable) and (II) the rights to cause the Company to register Shares
pursuant to Section 3 may be assigned by PGGM, DIHC or any Holder, but only
together with all obligations of Holders under Section 3 and Section 7.4, to a
transferee of Shares representing at least 1% of the issued and outstanding
shares of Common Stock, PROVIDED that, within a reasonable time after such
transfer, the Company is furnished with written notice of the name and address
of such transferee or assignee and the securities with respect to which such
registration rights are being assigned. Notwithstanding any transfer of Shares
in connection with an assignment permitted by this Section 9, the transferor
shall comply with the obligations set forth in Section 2 hereof.

         10.      MISCELLANEOUS. This Agreement constitutes the sole
understanding of the parties hereto with respect to the subject matter hereof;
provided, HOWEVER, that this provision is not intended to abrogate any other
written agreement between or among the parties executed with or after this
Agreement or any written agreement pertaining to


<PAGE>

another subject matter. No amendment of this Agreement shall be binding unless
made in writing and duly executed by the parties hereto. This Agreement shall be
construed in accordance with and governed by the laws of the State of New York
without regard to conflict of laws principles thereof. No provision of this
Agreement shall be construed against or interpreted to the disadvantage of any
party hereto by any court or other governmental or judicial authority or by any
board of arbitrators by reason of such party or its counsel having or being
deemed to have structured or drafted such provision. Unless otherwise expressly
provided herein, all references in this Agreement to Section(s) shall refer to
the Section(s) of this Agreement. The headings in this Agree-ment are for
purposes of reference only and shall not limit or otherwise affect the meaning
of this Agreement. This Agreement may be ex-ecuted in any number of
counterparts, each of which shall be an original, but all of which together
shall constitute one instrument.

         11.      NOTICES. All notices, requests, claims, demands and other
communications hereunder shall be in writing and shall be given or made (and
shall be deemed to have been duly given or made upon receipt) by delivery in
person, by courier service, by cable, by telecopy, by telegram, by telex or by
registered or certified mail (postage prepaid, return receipt requested) to the
respective parties at the following addresses (or at such other address for a
party as shall be specified in a notice given in accordance with this Section
11):

<TABLE>
<S>                                         <C>
                  (a)      IF TO PGGM:        Pensioenfonds PGGM
                                              Kroostweg-Noord 149
                                              3704 DV Zeist
                                              The Netherlands
                                              P. O. Box 117
                                              3700 AC Zeist
                                              The Netherlands
                                              Telecopy: 011 (31.30) 696-3388
                                              Attention:        Mr. Jan van der Vlist
                                                                Ms. Anneke C. van de Puttelaar

                           WITH A COPY TO:    Richards & O'Neil, LLP
                                              885 Third Avenue
                                              New York, New York 10022-4873
                                              Telecopy: (212) 750-9022
                                              Attention:        Robert M. Safron, Esq.

                  (b)      IF TO DIHC:        200 Galleria Parkway, NW
                                              Suite 2000
                                              Atlanta, Georgia 30339
                                              Telecopy: (770) 951-9349
                                              Attention:        Mr. Craig Johnston

                           WITH A COPY TO:    Richards & O'Neil, LLP

</TABLE>


<PAGE>

<TABLE>
<S>                                           <C>
                                              885 Third Avenue
                                              New York, New York 10022-4873
                                              Telecopy: (212) 750-9022
                                              Attention:        Robert M. Safron, Esq.

                  (c)      IF TO THE COMPANY: 126 East 56th Street
                                              New York, New York 10022
                                              Telecopy: (212) 605-7199
                                              Attention:        Mr. John S. Moody

                           WITH A COPY TO:    King & Spalding
                                              191 Peachtree Street, NE
                                              Atlanta, Georgia 30303
                                              Telecopy: (404) 572-5148
                                              Attention:        William B. Fryer, Esq.

</TABLE>

                  (d)      If to any other Holder to the address set forth in
the notice referred to in Section 9 hereof.

         12.      REMEDY. In the event that the Company materially breaches its
obligations to PGGM under Sections 7.1 and 7.2 hereof and such breach continues
for a period of 30 days after PGGM gives the Company written notice of such
breach, the obligations of PGGM under Sections 7.4, 7.5 and 8 shall thereafter
be suspended for such period of time as such breach continues; PROVIDED,
HOWEVER, that upon any such breach being cured by the Company or waived by PGGM,
PGGM shall again be obligated to comply with the provisions of Sections 7.4, 7.5
and 8.

         13.      THIRD PARTY BENEFICIARY. The parties to this Agreement agree
and acknowledge that Wilson III or the Wilson Designee are intended
beneficiaries of the provisions of Sections 7.1(d) and 7.9 of this Agreement,
and Wilson III and the Wilson Designee shall have the rights of intended
beneficiaries to enforce such provisions.


<PAGE>

                  IN WITNESS WHEREOF, the parties have caused this Agreement to
be executed and delivered as of the date first above written.

                               CORNERSTONE PROPERTIES INC.

                               By:  /s/ Thomas A. Nye
                                  ---------------------------------
                                   Name:  Thomas A. Nye
                                   Title: Vice President

                               DUTCH INSTITUTIONAL HOLDING COMPANY, INC.

                               By:  /s/  Craig W. Johnston
                                  ---------------------------------
                                   Name:  Craig W. Johnston
                                   Title: Vice President

                               STICHTING PENSIOENFONDS VOOR DE
                               GEZONDHEID, GEESTELIJKE EN
                               MAATSCHAPPELIJKE BELANGEN

                               By:  /s/ R.M.S.M. Munsters
                                  ------------------------------------
                                   Name:  R.M.S.M. Munsters
                                   Title: Managing Director Investments

                               By:  /s/  D.J. de Beus
                                  ------------------------------------
                                   Name:  D.J. de Beus
                                   Title: Chairman, Board of Managing Directors

     [Signature Page to Amended and Restated Registration Rights and Voting
                                   Agreement]


<PAGE>

                                    EXHIBIT A
                                       TO
                              AMENDED AND RESTATED
                    REGISTRATION RIGHTS AND VOTING AGREEMENT

Stockholders' Agreement dated November 22, 1996, between the Company and New
York State Teachers' Retirement System.

Stockholders' Agreement dated November 7, 1996, between the Company and Hexalon
Real Estate, Inc.

Letter Agreement dated July 10, 1995 between the Company and Deutsche Bank AG.

Registration Rights Agreement dated June 3, 1998, by and between the Company and
the parties named therein.

Registration Rights Agreement dated as of January 29, 1998, among the Company
and the Holders identified therein.

Registration Rights Agreement dated as of April 28, 1998, among the Company and
the Holders identified therein.

Registration Rights Agreement dated as of April 28, 1998, among the Company and
The Prudential Insurance Company of America.

Registration Rights and Lockup Agreement dated December 16, 1998, by and between
the Company and the parties named therein.



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