Document:

FIRST AMENDMENT TO STOCK PURCHASE AGREEMENT

     THIS FIRST AMENDMENT TO STOCK PURCHASE AGREEMENT (this "Amendment") is
entered into by and between CarrAmerica Realty Corporation ("Seller") and
FrontLine Capital Group (formerly known as Reckson Services Industries, Inc.)
("Buyer") as of April 29, 2000.

                                   RECITALS:

     WHEREAS, Seller and Buyer entered into a Stock Purchase Agreement dated
as of January 20, 2000 (such agreement as heretofore, hereby and hereinafter
amended, the "Stock Purchase Agreement") pursuant to which Seller agreed to
sell shares of common stock of HQ Global Workplaces, Inc. (the "Company")
owned by it to Buyer on the terms set forth therein;

     WHEREAS, the parties hereto wish to make certain amendments to the Stock
Purchase Agreement; and

     WHEREAS, capitalized terms not otherwise defined herein shall have the
meanings set forth in the Stock Purchase Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the respective
covenants and agreements set forth herein, the parties, intending to be
legally bound, agree as follows:

     1. The second sentence of Section 4(c)(ii) of the Stock Purchase
Agreement is hereby deleted in its entirety and replaced by the following:

        "Other than (i) this Agreement, (ii) the Amended and
        Restated Stockholders Agreement dated as of September 29,
        1998 by and among the Company, Seller and certain other
        stockholders of the Company (the "Existing Stockholders
        Agreement"), and (iii) any stockholders agreement to be
        executed in connection with the Closing hereunder, none of
        the Shares are subject to any agreement, contract,
        commitment, understanding or arrangement, including any such
        agreement, contract, commitment, understanding or
        arrangement restricting or otherwise relating to the voting,
        dividend rights or disposition of the Shares."

     2. The last sentence of Section 5(c) of the Stock Purchase Agreement is
hereby deleted in its entirety and replaced with the following:

        "No consent, approval, license, permit, order or
        authorization of, or registration, declaration or filing
        with, any Governmental Entity is required to be obtained or
        made by or with respect to the Buyer in connection with the
        execution, delivery, performance of this Agreement by the
        Buyer or the consummation of the transactions contemplated
        hereby."

     3. Section 5 of the Stock Purchase Agreement is hereby amended by adding
the following section:

        "(d) Investment Representation. Each party acquiring Shares hereunder
        will be receiving the Shares for his or its own account for
        investment only and not with a view towards distribution or resale.
        Each party acquiring Shares hereunder will either be an "accredited"
        investor within the meaning of Rule 501 promulgated under the
        Securities Act of 1933, as amended (the "Securities Act"), or will
        have such knowledge and experience in financial and business matters
        that such party is capable of evaluating the merits and risks of
        investment in the Shares and will be able to bear the economic risk
        of its investment in the Shares. Each party acquiring Shares
        hereunder acknowledges that any routine sale of such Shares made in
        reliance upon Rule 144 promulgated under the Securities Act can be
        made only in accordance with the terms and conditions of such Rule
        and further, that in case such Rule is not applicable to any sale of
        the Shares, resale thereof may require compliance with some other
        exemption under the Securities Act prior to resale. Each party
        acquiring Shares hereunder acknowledges that the certificates
        representing the Shares issued pursuant to this Agreement shall bear
        the following legend:

        "THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE
        SECURITIES ACT OF 1933. SUCH SECURITIES MAY NOT BE SOLD OR
        OFFERED FOR SALE, TRANSFERRED, HYPOTHECATED OR OTHERWISE
        ASSIGNED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION
        STATEMENT WITH RESPECT THERETO UNDER SUCH ACT OR AN OPINION
        OF COUNSEL THAT AN EXEMPTION FROM REGISTRATION FOR SUCH
        SALE, OFFER, TRANSFER, HYPOTHECATION OR OTHER ASSIGNMENT IS
        AVAILABLE UNDER SUCH ACT.""

     4. Section 12(a)(iv) is hereby deleted in its entirety and replaced with
the following:

        "by the Seller or Buyer (provided, however, in the case of Buyer,
        only if Buyer has given the Seller at least five business days' prior
        written notice of its intention to terminate pursuant to this Section
        12(a)(iv), which notice may not be given prior to June 1, 2000), if
        the Closing does not occur on or prior to May 31, 2000;"

     5. Section 24 is hereby deleted in its entirety and replaced with the
following:

        "24. Additional Signature Parties. At any time after the date hereof
        and at or prior to five (5) business days prior to the Closing, any
        other holder of Non-Voting Common Stock, any holder of voting common
        stock, par value $.01 per share of the Company (the "Voting Common
        Stock") and any holder of warrants to acquire shares of Non-Voting
        Common Stock (the "Warrants") as of the date hereof shall be
        permitted to execute and deliver to the Buyer an Additional Party
        Signature Page substantially in the form of Annex B hereto (each such
        party who executes and delivers to the Buyer such document, an
        "Additional Stockholder Party"), pursuant to which such Additional
        Stockholder Party shall be entitled, subject to the terms and
        conditions herein, to become a "Seller" for all purposes of this
        Agreement, and shall be entitled to sell to Buyer the number of
        shares of Non-Voting Common Stock or Voting Common Stock or the
        number of Warrants, held by such Additional Stockholder Party and set
        forth on such Additional Party Signature Page on the same terms set
        forth in this Agreement; provided that each holder of Warrants that
        elects to sell Warrants hereunder shall be entitled to receive a
        price per Warrant, equal to the Per Share Purchase Price, as adjusted
        hereunder, minus the exercise price of such Warrant. Each Additional
        Stockholder Party shall be deemed to have made the representations
        and warranties of Seller herein and be bound by the other agreements
        of Seller herein, and the shares of Non-Voting Common Stock and
        Voting Common Stock and the Warrants sold by each such party shall be
        deemed "Shares" for all purposes hereunder. To the extent that any
        Additional Stockholder Party elects to sell shares of Non-Voting
        Common Stock, shares of Voting Common Stock or Warrants, the number
        of shares of Non-Voting Common Stock to be sold by CarrAmerica
        pursuant to this Agreement shall be decreased by the number of shares
        of Non-Voting Common Stock, shares of Voting Common Stock or
        Warrants, as applicable, to be sold by such Additional Stockholder
        Party, it being intended that the Buyer shall be entitled to and
        required to purchase only the number of shares of Non-Voting Common
        Stock, shares of Voting Common Stock and Warrants, in the aggregate
        from CarrAmerica and all Additional Stockholder Parties, shown as
        being proposed to be sold by CarrAmerica on Exhibit A as delivered on
        January 20, 2000; provided that, notwithstanding anything to the
        contrary contained herein, in the event any Additional Stockholder
        Party shall breach any representation or warranty or otherwise fail
        to perform any of its obligations under this Agreement, CarrAmerica
        shall have the right to make such representation or warranty and
        otherwise perform such obligations on behalf of such Additional
        Stockholder Party. If Warrants are sold to Buyer pursuant to this
        Section 24, Buyer will immediately exercise such Warrants and pay the
        exercise price therefor to the Company (or its successors)."

     6. Simultaneously with the execution of this Amendment, RSI shall
contribute $1,350,000 to VANTAS and VANTAS shall pay $1,350,000 in cash (the
"Company Stockholder Extension Payment") to the Company, as agent for the
stockholders of the Company who have elected to sell all or a portion of their
shares in the Company, as compensation for the extension of the Closing Date
from April 30, 2000 to May 31, 2000, which funds shall be distributed by the
Company on a pro rata basis to such stockholders based on the percentage of
shares being sold by each such stockholder divided by the total number of
shares being sold. The Company Stockholder Extension Payment is nonrefundable
and will not be used to adjust the consideration otherwise payable in
connection with the consummation of the transactions contemplated by the Stock
Purchase Agreement.

     7. Seller represents and warrants that Seller has the requisite capacity
and authority, and has taken all actions necessary in order, to execute,
deliver and perform its obligations under this Amendment. This Amendment is a
legal, valid and binding obligation of Seller, enforceable in accordance with
its terms, except insofar as enforcement thereof may be limited by bankruptcy,
insolvency or other laws relating to or affecting enforcement of creditors'
rights generally including such general equitable principles as may apply in
the enforcement of creditors' rights.

     8. Buyer represents and warrants that Buyer has the requisite capacity
and authority, and has taken all actions necessary in order, to execute,
deliver and perform its obligations under this Amendment. This Amendment is a
legal, valid and binding obligation of Buyer, enforceable in accordance with
its terms, except insofar as enforcement thereof may be limited by bankruptcy,
insolvency or other laws relating to or affecting enforcement of creditors'
rights generally including such general equitable principles as may apply in
the enforcement of creditors' rights.

     9. This Amendment and the other agreements referred to herein represent
the entire understanding of the parties with respect to the subject matter
contained herein. This Amendment may not be amended, modified or waived except
in a writing signed by the party against whom enforcement of such amendment,
modification or waiver is sought. This Amendment shall be construed and
interpreted in accordance with the laws of the State of Delaware, without
reference to the conflict of laws principles contained therein. This Amendment
may be executed in one or more counterparts, each of which shall be deemed an
original, but all of which, when taken together, shall constitute one and the
same instrument.

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

                                      CARRAMERICA REALTY CORPORATION

                                      By:  /s/ Karen B. Dorigan
                                          --------------------------
                                          Name:  Karen B. Dorigan
                                          Title: Managing Director

                                      FRONTLINE CAPITAL GROUP

                                      By: /s/ Jason Barnett
                                          --------------------------------
                                          Name: Jason Barnett
                                          Title:  Executive Vice PresidentFIRST AMENDMENT TO STOCK PURCHASE AGREEMENT

     THIS FIRST AMENDMENT TO STOCK PURCHASE AGREEMENT (this "Amendment") is
entered into by and among CarrAmerica Realty Corporation ("CarrAmerica"),
OmniOffices (UK) Limited ("Omni UK"), OmniOffices (Lux) 1929 Holding Company
S.A. ("LuxCo"), VANTAS Incorporated ("VANTAS") and FrontLine Capital Group
(formerly known as Reckson Services Industries, Inc.) ("RSI") as of April
____, 2000.

                                   RECITALS:

     WHEREAS, CarrAmerica, Omni UK, LuxCo, VANTAS and RSI entered into a Stock
Purchase Agreement dated as of January 20, 2000 (such agreement, as
heretofore, hereby and hereinafter amended, the "UK Agreement") pursuant to
which CarrAmerica agreed to sell shares of common stock of Omni UK and LuxCo
owned by it together with its interest in certain loans made by it to Omni UK
and LuxCo to VANTAS on the terms set forth therein;

     WHEREAS, VANTAS, RSI, CarrAmerica, Omni UK and LuxCo have executed an
Agreement dated as of March 13, 2000, as amended, pursuant to which such
parties agreed to authorize certain actions governed by the UK Agreement;

     WHEREAS, the parties hereto wish to make certain additional amendments to
the UK Agreement; and

     WHEREAS, capitalized terms not otherwise defined herein shall have the
meanings set forth in the UK Agreement.

     NOW, THEREFORE, in consideration of the foregoing and the respective
covenants and agreements set forth herein, the parties, intending to be
legally bound, agree as follows:

     1. The second and third recitals of the UK Agreement are hereby deleted
in their entirety and replaced with the following:

        "WHEREAS, CarrAmerica has made certain loans to Omni UK and
        LuxCo as described on Exhibit B attached hereto, and may
        make additional loans to Omni UK and LuxCo as contemplated
        by Section 4.1(b)(iii) hereof (collectively, the "Loans"),
        which Loans are or will be evidenced by promissory notes,
        the date and denominations of which as of the date hereof
        are set forth on Exhibit B (the "Notes");

        WHEREAS, CarrAmerica desires to sell and transfer to VANTAS
        and VANTAS desires to purchase from CarrAmerica (i) the
        Notes in exchange for an amount equal to the principal
        amount of, and any accrued and unpaid interest with respect
        to, the Notes outstanding as of the Closing Date in
        accordance with Section 1.2 (the "Loan Consideration"), and
        (ii) all of the shares of non-voting common stock, par value
        (pound).01 per share, of Omni UK (which represents
        approximately 95% of the equity interest in Omni UK) (the
        "UK Non-Voting Common Stock") and all of the shares of
        non-voting common stock, par value $250 per share, of LuxCo
        (which represents approximately 95% of the equity interest
        in LuxCo) (the "Lux Non-Voting Common Stock"; and together
        with the UK Non-Voting Common Stock, collectively, the
        "Shares") owned of record by the Seller for total
        consideration equal to the "Share Consideration" as
        calculated pursuant to Annex A (the "Share Consideration");"

     2. Section 2.3 of the UK Agreement is hereby amended by inserting the
following at the end of Section 2.3:

        "Notwithstanding anything to the contrary contained herein,
        the parties acknowledge that, in connection with the
        consummation of the transactions contemplated by the Merger
        Agreement, the consent of the general partner of Mercury
        Executive Offices, L.P. may be required under the Limited
        Partnership Agreement dated November 16, 1998 and the
        management agreements related thereto; it being understood
        that Omni UK, LuxCo, VANTAS and RSI shall use commercially
        reasonable efforts to obtain such consent."

     3. Section 2.12(a) of the UK Agreement is hereby amended by deleting the
first sentence in its entirety and replacing it with the following:

        "Neither of the Companies nor any of their respective
        Subsidiaries owns any real property or interests in real
        property, other than OmniUK Real Property Leases (as defined
        below), LuxCo Real Property Leases (as defined below), the
        OmniUK Owned Property (as defined below) and certain
        interests in certain real property assets held directly or
        indirectly through the MAM Investment (as defined below)."

     4. The provision immediately following Section 2.13(j) on page 12 of the
UK Agreement is hereby deleted in its entirety and replaced with the
following:

        "; provided, however, that notwithstanding anything to the
        contrary contained herein other than any contracts relating
        to office equipment, maintenance or service for any
        individual business center of the Companies or their
        respective Subsidiaries which does not require annual
        payments in excess of $25,000, the sum of the aggregate
        future liabilities and costs of termination associated with
        all contracts, arrangements, agreements or understandings to
        which either of the Companies or any of their respective
        Subsidiaries is a party or by which they or any of their
        respective properties or assets which are not set forth on
        Schedule 5.2, 2.13 or 2.16 is bound does not exceed
        $5,000,000."

     5. Section 2.28 of the UK Agreement is hereby deleted in its entirety and
replaced with the following:

        "Section 2.28 MAM Investment. OmniUK and certain of its
        Subsidiaries have agreed to invest up to (pound)20 million
        in Mercury Executive Offices, L.P. on the terms and
        conditions set forth in the limited partnership agreement,
        dated November 16, 1998 (the "MAM Investment"), of which at
        least (pound)15,594,241 has been funded. Notwithstanding
        anything to the contrary contained herein, the parties
        acknowledge that, in connection with the consummation of the
        transactions contemplated by the Merger Agreement, the
        consent of the general partner of Mercury Executive Offices,
        L.P. may be required under the Limited Partnership Agreement
        dated November 16, 1998 and the management agreements
        related thereto; it being understood that Omni UK, LuxCo,
        VANTAS and RSI shall use commercially reasonable efforts to
        obtain such consent."

     6. Section 4.1(b)(iii) of the UK Agreement is hereby deleted in its
entirety and replaced with the following:

        "incur or assume any liabilities or incur any indebtedness
        for borrowed money, assume, guarantee, endorse or otherwise
        as an accommodation become responsible for the obligations
        of any other individual, corporation or entity (other than a
        wholly owned Subsidiary) except pursuant to contracts or
        agreements listed in Schedule 2.13 or except for loans and
        equity investments (which shall be deemed to be included on
        Exhibit A or Exhibit B, as applicable, attached hereto) by
        CarrAmerica necessary to fund the business of the Companies
        in the ordinary course or to fund committed developments;"

     7. Section 4.1(b)(v) of the UK Agreement is hereby deleted in its
entirety and replaced with the following:

        "make any material change in any Omni UK Real Property Lease
        or LuxCo Real Property Lease, as applicable, or other
        contracts or enter into, renew, fail to renew, terminate or
        permit to be terminated any Omni UK Real Property Lease or
        LuxCo Real Property Lease, as applicable, any other contract
        or agreement that calls for aggregate annual payments of
        $25,000 or more and which either (i) is not terminable by
        either of the Companies or their respective Subsidiary, as
        applicable, at will on 60 days or less notice without
        payment of a penalty or (ii) has a term of more than six
        months, other than the operating leases and related letters
        of comfort executed by Omni UK, LuxCo or any Subsidiaries
        thereof with respect to development and refurbishment
        projects identified in the CapEx Budget, as contemplated by
        the operating budgets for those projects;"

     8. Section 5.5 of the UK Agreement is hereby amended by inserting the
following sentence at the end of such section:

        "Not later than six months after the Closing, the Second
        Step Surviving Corporation shall reimburse CarrAmerica, as
        agent for itself and the stockholders of HQ Global
        Workplaces, Inc. ("HQ Global") immediately prior to the
        Closing (based on their proportionate indirect beneficial
        interests in Omni UK and LuxCo), for any additional lease
        deposits of Omni UK and LuxCo that are not identified on the
        disclosure schedules delivered in connection with the
        execution of this Agreement; provided that the Second Step
        Surviving Corporation is provided with a schedule of such
        additional lease deposits at or prior to Closing."

     9. Article 5 of the UK Agreement is hereby amended by adding the
following sections at the end of such Article 5:

        "Section 5.6 MAM Hammersmith Center. RSI and VANTAS hereby
        consent to the development of the MAM Hammersmith center.
        Immediately subsequent to the Closing, the Second Step
        Surviving Corporation shall reimburse CarrAmerica, as agent
        for itself and the stockholders of HQ Global immediately
        prior to the Closing (based on their proportionate indirect
        beneficial interests in Omni UK and LuxCo), for any costs
        that have been or will be incurred prior to Closing in
        connection with the development of the MAM Hammersmith
        center; provided that the Second Step Surviving Corporation
        is provided with a schedule of such amounts at or prior to
        Closing.

        Section 5.7 Prepaid Rent; Tenant Reimbursement. Immediately
        subsequent to the Closing, the Second Step Surviving
        Corporation shall pay to CarrAmerica, as agent for itself
        and the stockholders of HQ Global immediately prior to the
        Closing (based on their proportionate indirect beneficial
        interests in Omni UK and LuxCo), $576,000, which represents
        the amount of rent of Omni UK and LuxCo that was prepaid for
        the period after Closing;; provided that the Second Step
        Surviving Corporation is provided with a schedule of such
        amounts at or prior to Closing.

        Section 5.8 Capital Expenditures and Cash Fundings.
        Immediately subsequent to the Closing, the Second Step
        Surviving Corporation shall reimburse CarrAmerica, as agent
        for itself and the stockholders of HQ Global immediately
        prior to the Closing (based on their proportionate indirect
        beneficial interests in Omni UK and LuxCo), for all capital
        expenditures and development expenses of Omni UK or LuxCo
        incurred after April 30, 2000 and prior to Closing,
        including amounts funded to enable Omni UK to satisfy its
        capital commitments with respect to the MAM Investment;
        provided that the Second Step Surviving Corporation is
        provided with a schedule of such amounts at or prior to
        Closing.

        Section 5.9 Side Letter. At Closing, VANTAS shall assume the
        obligations of CarrAmerica with respect to that certain Side
        Letter dated as of November 16, 1998 by and among HQMerc UK
        Management Limited ("HQ Merc"), P.R.A. Investments Limited
        ("PRA"), P.K. Investments Limited ("PKL"), Peter Allport
        ("Allport"), Peter Kershaw ("Kershaw"), HQ Holdings Limited
        ("HQ Holdings") and CarrAmerica and that certain Side Letter
        dated as of November 16, 1998 by and among HQ Merc UK
        Partnership Limited, PRA, PKL, Allport, Kershaw, HQ Holdings
        and CarrAmerica."

     10. Section 6.2(b) of the UK Agreement is hereby deleted in its entirety
and replaced with the following:

        "CarrAmerica shall have received the cash required by Sections 1.2,
        5.3, 5.5, 5.6, 5.7 and 5.8."

     11. All references to "April 30, 2000" in Article X(a)(iv), Article
X(a)(vi) and Article X(a)(vii) of the UK Agreement are hereby changed to "May
31, 2000."

     12. All references to "May 1, 2000" in Article X(a)(iv) of the UK
Agreement are hereby changed to "June 1, 2000."

     13. The amount of the Loan Notes identified in Annex A to the UK
Agreement is hereby deleted and replaced with "21,229,392 (reduced by the
amount of any payments thereto prior to Closing)."

     14. Simultaneously with the execution of this Amendment, RSI shall
contribute $900,000 to VANTAS and VANTAS shall pay $900,000 in cash (the "UK
Stockholder Extension Payment") to CarrAmerica, as compensation for the
extension of the Closing Date from April 30, 2000 to May 31, 2000. The UK
Stockholder Extension Payment is nonrefundable and will not be used to adjust
the consideration otherwise payable in connection with the consummation of the
transactions contemplated by the UK Agreement.

     15. CarrAmerica, Omni UK and LuxCo represent and warrant, each as to
itself only, that each of CarrAmerica, Omni, UK and LuxCo has the requisite
capacity and authority, and has taken all actions necessary in order, to
execute, deliver and perform its obligations under this Amendment. This
Amendment is a legal, valid and binding obligation of each of CarrAmerica,
Omni UK and LuxCo, enforceable in accordance with its terms, except insofar as
enforcement thereof may be limited by bankruptcy, insolvency or other laws
relating to or affecting enforcement of creditors' rights generally including
such general equitable principles as may apply in the enforcement of
creditors' rights.

     16. VANTAS and RSI represent and warrant that each of VANTAS and RSI has
the requisite capacity and authority, and has taken all actions necessary in
order, to execute, deliver and perform its obligations under this Amendment.
This Amendment is a legal, valid and binding obligation of each of VANTAS and
RSI, enforceable in accordance with its terms, except insofar as enforcement
thereof may be limited by bankruptcy, insolvency or other laws relating to or
affecting enforcement of creditors' rights generally including such general
equitable principles as may apply in the enforcement of creditors' rights.

     17. This Amendment, the Merger Agreement, as amended, the Stock Purchase
Agreement, as amended, and the other agreements referred to herein and therein
represent the entire understanding of the parties with respect to the subject
matter contained herein. This Amendment may not be amended, modified or waived
except in a writing signed by the party against whom enforcement of such
amendment, modification or waiver is sought. This Amendment shall be construed
and interpreted in accordance with the laws of the State of Delaware, without
reference to the conflict of laws principles contained therein. This Amendment
may be executed in one or more counterparts, each of which shall be deemed an
original, but all of which, when taken together, shall constitute one and the
same instrument.

                           [signature page follows]

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

                                      CARRAMERICA REALTY CORPORATION

                                      By:  /s/ Karen B. Dorigan
                                          --------------------------
                                          Name:  Karen B. Dorigan
                                          Title: Managing Director

                                      OMNIOFFICES (UK) LIMITED

                                      By:  /s/ Thomas A. Carr
                                           ------------------------------
                                           Name: Thomas A. Carr
                                           Title: Director

                                      OMNIOFFICES (LUX) 1929 HOLDING
                                      COMPANY S.A.

                                      By:  /s/ Thomas A. Carr
                                           ------------------------------
                                           Name: Thomas A. Carr
                                           Title: Director

                                      FRONTLINE CAPITAL GROUP

                                      By: /s/ Jason Barnett
                                          --------------------------------
                                          Name: Jason Barnett
                                          Title:  Executive Vice President

                                      VANTAS INCORPORATED

                                      By:  /s/ Stephen M. Rathkopf
                                           -------------------------
                                           Name:  Stephen M. Rathkopf
                                           Title: Secretary

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