Document:

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                                     FORM OF
                             STOCKHOLDERS AGREEMENT
                                  by and among
                        RECKSON SERVICE INDUSTRIES, INC.,
                           HQ GLOBAL WORKPLACES, INC.,
                         CARRAMERICA REALTY CORPORATION
                                       and
            certain other stockholders of HQ GLOBAL WORKPLACES, INC.

                                   dated as of
                             _____________ __, 2000

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                                TABLE OF CONTENTS

                                                                            Page

1.    DEFINITIONS..............................................................1

2.    BOARD OF DIRECTORS OF THE COMPANY........................................3
      2.1.   Number of Directors...............................................3
      2.2.   Holder Nominees...................................................3
      2.3.   Independent Directors.............................................5
      2.4.   Termination.......................................................5

3.    INFORMATION RIGHTS.......................................................5
      3.1.   Information Rights of All Holders.................................5
      3.2.   Information Rights of 10% Holders.................................6
      3.3.   Confidentiality...................................................6
      3.4.   Termination.......................................................7

4.    LIMITATIONS ON CORPORATE ACTIONS.........................................7
      4.1.   REIT Restrictions.................................................7
      4.2.   No Acquisition of Common Stock from RSI or its Affiliates........11
      4.3.   No Contravening Agreement........................................11
      4.4.   Termination......................................................12

5.    PARTICIPATION RIGHTS....................................................12
      5.1.   Right to Participate.............................................12
      5.2.   Notice...........................................................12
      5.3.   Abandonment of Sale or Issuance..................................13
      5.4.   Terms of Sale....................................................13
      5.5.   Timing of Sale...................................................14
      5.6.   Termination of Participation Right...............................14

6.    TAG-ALONG RIGHTS........................................................15
      6.1.   Rights and Notice................................................15
      6.2.   Abandonment of Sale..............................................16
      6.3.   Timing of Sale...................................................16
      6.4.   Termination of Tag-Along Right...................................16

7.    PUT RIGHTS..............................................................16
      7.1.   2000 Put Right...................................................16
      7.2.   2001 Put Right...................................................17
      7.3.   2002 Put Right...................................................19
      7.4.   Procedures to Determine Fair Market Value........................20
      7.5.   Indemnification of Designated Holder.............................21

8.    TRANSFER RESTRICTIONS...................................................21
      8.1.   RSI Right of First Offer.........................................21
      8.2.   Holder Right of First Offer......................................22
      8.3.   No Obligation to Purchase........................................23
      8.4.   Termination of the Rights of First Offer.........................24
      8.5.   IPO Lock-Up......................................................24

9.    LEASE GUARANTEE INDEMNIFICATION.........................................24

10.   PURCHASE RIGHT AGREEMENT ANTI-DILUTION PROTECTION.......................25

11.   MISCELLANEOUS...........................................................25
      11.1.  RSI Assurance....................................................25
      11.2.  Assignment.......................................................25
      11.3.  Entire Agreement; Amendment......................................25
      11.4.  Waiver...........................................................26
      11.5.  Limitation on Benefit............................................26
      11.6.  Binding Effect...................................................26
      11.7.  Governing Law....................................................26
      11.8.  Notices..........................................................26
      11.9.  Headings.........................................................28
      11.10. Execution in Counterparts........................................28
      11.11. Interpretation; Absence of Presumption...........................29
      11.12. Severability.....................................................29
      11.13. Specific Performance.............................................29
      11.14. Consent to Jurisdiction..........................................29
      11.15. Litigation Costs.................................................30

EXHIBIT A

<PAGE>

                             STOCKHOLDERS AGREEMENT

          THIS STOCKHOLDERS AGREEMENT (this "Agreement"), dated as of __________
__, 2000, is made by and among Reckson Service Industries, Inc., a Delaware
corporation ("RSI"), HQ Global Workplaces, Inc., a Delaware corporation (the
"Company"), CarrAmerica Realty Corporation, a Maryland corporation
("CarrAmerica" or the "Designated Holder"), and the undersigned holders of
Common Stock of the Company (together with CarrAmerica, the "Holders").

          WHEREAS, RSI and the Holders have entered into that certain
Stock Purchase Agreement, dated as of January 20, 2000 pursuant to which RSI is
acquiring on the date hereof certain shares of Common Stock of the Company owned
by the Holders (the "Transaction");

          WHEREAS, the parties believe it is in their best interests to enter
into this Agreement and provide for certain rights and restrictions with respect
to the continuing investment by RSI and each Holder in the Company and the
corporate governance of the Company; and

          WHEREAS, it is a condition precedent to the completion of the
Transaction that the parties enter into this Agreement.

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

1.   DEFINITIONS

          As used in this Agreement, certain capitalized terms not otherwise
defined herein shall have the following respective meanings:

          "10% Holder" shall mean any Holder hereunder who, together
with any Affiliates, holds more than ten percent (10%) of the total number of
issued and outstanding shares of Common Stock of the Company.

          "Affiliate" shall mean, with respect to any Person, (i) any Person
directly or indirectly controlling, controlled by or under common control with
such Person, or (ii) any officer, director, general partner, managing member or
trustee of such Person or any Person referred to in clause (i) above. For
purposes of this definition, "control," when used with respect to any Person,
means the power to direct the management and policies of such Person, directly
or indirectly, whether through the ownership of voting securities, by contract
or otherwise, and the terms "controlling" and "controlled" have meanings
correlative to the foregoing.

          "Board" shall mean the board of directors of the Company.

          "Code" shall mean the Internal Revenue Code of 1986, as amended
(including for this purpose the amendments made to Section 856(c)(4)(B)(iii) of
the Code by Pub. L. No. 106-170, The Ticket to Work and Work Incentives
Improvement Act of 1999, 113 Stat. 1860 (the "RMA")), and any successor thereto,
including all of the rules and regulations promulgated thereunder.

          "Common Stock" shall mean any common stock of the Company, including,
without limitation, the Voting Common Stock and the Nonvoting Common Stock.

          "Director" shall mean a member of the Board.

          "Government Authority" shall mean any government or state (or
any subdivision thereof) of or in the United States or any foreign nation, or
any agency, authority, bureau, commission, department or similar body or
instrumentality thereof, or any governmental court or tribunal.

          "Immediate Family Member" shall mean, with respect to any natural
Person, (i) such natural Person's spouse, parents, descendants, nephews, nieces,
brothers and sisters, and (ii) any trust established by such Person or any of
the persons listed in clause (i) above, the sole beneficiaries of which are such
Person or any of the persons listed in clause (i) above.

          "Independent Director" shall mean any Director who (i) is not an
officer or employee of the Company, (ii) is not an officer, employee or director
of RSI, (iii) does not have a material financial interest in or relationship
with RSI (it being agreed that for purposes of this definition, any Director who
owns less than five percent (5%) of the issued and outstanding RSI common stock
shall be deemed not to have a material financial interest in or relationship
with RSI by virtue of such stock ownership), and (iv) is not an Affiliate or an
Immediate Family Member of any Person covered by clauses (i), (ii) or (iii)
above.

          "IPO" shall mean one or more sales of Common Stock by the Company
pursuant to one or more registration statements effective under the Securities
Act of 1933, as amended (the "1933 Act") that results in (i) gross proceeds to
the Company of not less than $150,000,000 and (ii) the listing for trading on
either the NASDAQ Stock Market or a national securities exchange of all shares
of Voting Common Stock of the Company.

          "Majority Consent of the Holders" shall mean the approval of
Holders owning at least a majority of all of the issued shares of Voting Common
Stock owned by the Holders at such time.

          "Nonvoting Common Stock" shall mean the Nonvoting Common Stock, par
value $.01 per share, of the Company.

          "Person" shall mean any individual, corporation, partnership, limited
liability company, joint venture, trust, unincorporated organization, other form
of business or legal entity or Government Authority.

          "SEC" shall mean the Securities and Exchange Commission.

          "RSI Board" shall mean the board of directors of RSI.

          "transfer" means a sale, gift, assignment, exchange or other
disposition (including a voluntary or involuntary disposition under judicial
order, legal process, execution, attachment or enforcement of an encumbrance) or
any other transfer of beneficial interest of shares of Common Stock. A
"transfer" shall not include (i) in the case of an individual, a transfer to an
Immediate Family Member, (ii) in the case of a partnership, a transfer by the
partnership to an Affiliate or to its partners in connection with a dissolution
of the partnership, (iii) in the case of a corporation, a transfer by the
corporation to an Affiliate or to its stockholders in connection with the
dissolution of the corporation, (iv) in the case of a limited liability company,
a transfer by the limited liability company to an Affiliate or to its members in
connection with the dissolution of the limited liability company, or (v) in the
case of any entity referred to in clause (ii), (iii) or (iv) above, any transfer
of an interest in the securities of such entity or any other indirect transfer
that may occur as a result of either a consolidation, merger or other business
combination involving such entity or a sale, lease, exchange or other transfer
of all or substantially all of the assets of such entity; provided, that a
transferee under (i) -(v) above agrees in writing to be bound by all of the
terms of this Agreement by executing and delivering to the Company a counterpart
signature page to this Agreement.

          "U.S. Stock Purchase Agreement" shall mean the Stock Purchase
Agreement between CarrAmerica and RSI dated as of January 20, 2000.

          "Voting Common Stock" shall mean the Voting Common Stock, par value
$.01 per share, of the Company.

2.   BOARD OF DIRECTORS OF THE COMPANY

     2.1.     Number of Directors

          From and after the date hereof, the Board shall consist of
eleven (11) Directors. The number of Directors may not be decreased unless such
decrease is approved by a Majority Consent of the Holders.

     2.2.     Holder Nominees

          (a) Nomination of Directors. At each annual or special meeting of
stockholders of the Company at, or the taking of action by written consent of
stockholders of the Company with respect to, which any Directors are to be
elected, each Holder (a "Nominating Holder") shall have the right (but not the
obligation) to nominate for election to the Board that number of Directors which
represents the same proportion of the total number of Directors as is
represented by the number of shares of Voting Common Stock which such Holder
then owns, as of the applicable record date for such meeting or consent (or, in
the case of the first annual meeting of stockholders of the Company following
the Closing, if the record date for such annual meeting is prior to the date of
the Closing, then as of the date of the Closing), relative to the number of
shares of Voting Common Stock outstanding as of such date (such Directors,
"Holder Nominees"). Notwithstanding the foregoing, if a Holder shall make an
equity investment, through a joint venture or otherwise, in Regus Business
Corp., Servcorp or a company that, at the time such investment is made, is a
significant regional competitor of the Company in the executive suites business,
such Holder's right under this Section 2.2(a) shall terminate. In computing the
number of Holder Nominees, any fraction shall be rounded down to the nearest
whole number (and, if such fraction shall be less than one, then such Holder
shall have no right to nominate any Director for election). If Directors are
placed into two or more classes pursuant to the Company's certificate of
incorporation, the Holder Nominees shall be placed in as many different classes
as possible.

          (b) Qualification of Holder Nominees. No Nominating Holder shall name
any person as a Holder Nominee if (i) such person is not reasonably experienced
in business or financial matters, (ii) such person has been convicted of, or has
pled nolo contendere to, a felony, (iii) the election of such person would
violate any applicable law, (iv) any event described in Item 401(f) of
Regulation S-K promulgated under the 1933 Act has occurred with respect to such
person, or (v) such person is an Affiliate of, or has a material financial
interest in, (A) any individual or entity that engages, as the principal
component of its business, in activities that are directly competitive with the
Company in the executive suites business, or (B) any entity whose primary
business is to invest in business to business e-commerce companies, which has
invested an aggregate of at least $50 million in such companies.

          (c) Support of Holder Nominees by RSI and the Company. RSI shall
support, and the Board and any nominating committee (or any other committee
exercising a similar function) thereof shall recommend, the nomination of each
Holder Nominee to the Board. The Board shall recommend to the stockholders of
the Company the election of each Holder Nominee, and the Company and RSI shall
exercise all authority under applicable law to cause each Holder Nominee to be
elected to and to remain a member of the Board for the term for which the Holder
Nominee is nominated. Without limiting the generality of the foregoing, with
respect to each meeting of stockholders of the Company at which Directors are to
be elected, (i) the Company shall use its commercially reasonable efforts to
solicit from the stockholders of the Company eligible to vote in the election of
Directors proxies in favor of each Holder Nominee, and (ii) RSI shall vote its
shares of Voting Common Stock in favor of each Holder Nominee at any
stockholders meeting (or written consent in lieu thereof).

          (d) Support of RSI Nominees by CarrAmerica. Provided that the nominees
proposed by RSI meet the qualifications set forth in Section 2.2(b)(i)-(iv)
above (each, an "RSI Nominee"), CarrAmerica shall support and the Board or any
nominating committee (or any other committee exercising a similar function)
thereof shall recommend, the nomination of each RSI Nominee to the Board. RSI
shall have the right to nominate all of the directors other than the Holder
Nominees. The Board shall recommend to the stockholders of the Company the
election of each RSI Nominee and the Company shall exercise all authority under
applicable law to cause each RSI Nominee to be elected to and to remain a member
of the Board for the term for which the RSI Nominee is nominated. With respect
to each meeting of stockholders of the Company at which Directors are to be
elected, CarrAmerica shall vote its shares of Voting Common Stock in favor of
each RSI Nominee at any stockholders meeting (or written consent in lieu
thereof).

          (e) Vacancies. In the event that any Holder Nominee shall
cease to serve as a Director for any reason other than the fact that the
Nominating Holder no longer has a right to nominate a Director, as provided in
Section 2.2(a), the vacancy resulting thereby shall be filled by a Holder
Nominee designated by the Nominating Holder which nominated the vacating
Director; provided, however, that any Holder Nominee so designated shall satisfy
the qualification requirements set forth in Section 2.2(b).

     2.3.     Independent Directors

          (a) Number of Independent Directors. From and after the date hereof,
the Board shall include at least two (2) Independent Directors.

          (b) RSI and Holder Support of Independent Director Nominees. RSI shall
nominate and the Holders shall support, and the Board and any nominating
committee (or any other committee exercising a similar function) thereof shall
recommend, the nomination of at least two (2) Independent Directors at all
times, and the Company, the Holders and RSI shall exercise all authority under
applicable law to cause each Independent Director nominee so supported to be
elected to and remain a member of the Board for the term for which such
Independent Director is nominated. Without limiting the generality of the
foregoing, with respect to each meeting of stockholders of the Company at which
Directors are to be elected, (i) the Company shall use its commercially
reasonable efforts to solicit from the stockholders of the Company eligible to
vote in the election of Directors proxies in favor of each Independent Director
nominee that is nominated pursuant to this Section 2.3(b), and (ii) RSI and the
Holders shall vote their respective shares of Voting Common Stock in favor of
each Independent Director nominee that is nominated pursuant to this Section
2.3(b).

     2.4.     Termination

          The rights of the Holders pursuant to this Section 2 shall terminate
on the first date on which no Holder has a right to Board representation
pursuant to Section 2.2(a) hereof.

3.   INFORMATION RIGHTS

     3.1.     Information Rights of All Holders

          (a) Quarterly Financial Information. From and after the date hereof,
the Company shall deliver to each Holder as soon as available and in any event
within thirty (30) days after the close of each of the first, second and third
fiscal quarters of the Company, the unaudited consolidated balance sheet of the
Company and its subsidiaries as at the end of such period and the related
unaudited consolidated statements of income, retained earnings and cash flows of
the Company and its subsidiaries for such period, setting forth in each case in
comparative form the figures for the corresponding periods of the previous
fiscal year, all of which shall be certified by the chief financial officer or
the chief accounting officer of the Company, in his or her opinion, to present
fairly in all material respects and in accordance with generally accepted
accounting principles ("GAAP"), the consolidated financial position of the
Company and its subsidiaries as at the date thereof and the results of
operations for such period (subject to normal year-end adjustments).

          (b) Annual Financial Information. From and after the date hereof, the
Company shall deliver to each holder as soon as available and in any event
within seventy-five (75) days after the end of each fiscal year of the Company,
the audited consolidated balance sheet of the Company and its subsidiaries as at
the end of such fiscal year and the related audited consolidated statements of
income, retained earnings and cash flows of the Company and its subsidiaries for
such fiscal year, setting forth in comparative form the figures as at the end of
and for the previous fiscal year, all of which shall be certified by (A) the
chief financial officer or the chief accounting officer of the Company, in his
or her opinion, to present fairly in all material respects and in accordance
with GAAP, the financial position of the Company and its subsidiaries as of the
date thereof and the result of operations for such period and (B) independent
certified public accountants of recognized national standing.

     3.2.     Information Rights of 10% Holders

          In addition to the information rights set forth in Section 3.1 hereof,
from and after the date hereof, the Company shall:

          (a) Financial Reports. Deliver to each 10% Holder, as soon as
practicable after the end of each month, an operating and financial statement
and management report of the Company and its subsidiaries (including each
subsidiary, if any, not consolidated with the Company) as at and for the end of
such month, all in such form as may be prepared by the Company for internal use
by management.

          (b) Securities Filings. Deliver to each 10% Holder, as promptly as
practicable following filing, a copy of each report, schedule or other document
filed by the Company pursuant to the requirements of any federal or state
securities laws (collectively, the "Securities Filings").

          (c) Opportunity to Review Securities Filings. Afford each 10%
Holder a reasonable opportunity to review any portion of any Securities Filing
which refers to, describes or mentions such 10% Holder prior to the time that
such Securities Filing is filed with or sent to the applicable Government
Authority.

          (d) Delivery of Annual Budget of the Company. Deliver to each 10%
Holder a copy of the approved annual operating budget for the Company and its
subsidiaries.

     3.3.     Confidentiality

          Each Holder shall keep all information provided to it or any of its
representatives pursuant to this Agreement confidential, and such Holder shall
not disclose such information to any Persons other than the directors, officers,
employees, financial advisors, legal advisors, accountants and consultants of
any Holder who reasonably need to have access to the confidential information
and (i) in the case of directors, officers, employees, legal advisors and the
principal accountants of such Holder, who are advised of the confidential nature
of such information, and (ii) in the case of any financial advisors, other
accountants or consultants of such Holder, who execute an agreement with the
Company agreeing to maintain the confidentiality of such information; provided,
however, the foregoing obligation of each Holder shall not (A) relate to any
information that (i) is or becomes generally available other than as a result of
unauthorized disclosure by such Holder or by Persons to whom such Holder has
made such information available, or (ii) is or becomes available to such Holder
on a non-confidential basis from a third party that is not, to such Holder's
knowledge, bound by any other confidentiality agreement with the Company or RSI,
or (B) prohibit disclosure of any information if such Holder believes in good
faith that disclosure is required by law, rule, regulation, court order or other
legal or governmental process (including SEC or GAAP reporting requirements) or
if such Holder believes in good faith that disclosure is advisable to explain a
material deviation from its expected financial results that arises from its
investment in the Company; provided further, that in the case of a disclosure
described in clause (B) above, such Holder shall (i) give prior notice to the
Board of any such disclosure and (ii) consult with the Board prior to making
such disclosure.

     3.4.     Termination

          The rights granted to the Holders pursuant to Section 3.1 and Sections
3.2(a) and 3.2(d) shall terminate upon such date that the Company's Common Stock
is listed for trading on either the NASDAQ Stock Market or a national securities
exchange. The obligations assumed by the Holders pursuant to Section 3.3 shall
remain in full force and effect until the first anniversary of the consummation
of an IPO.

4.   LIMITATIONS ON CORPORATE ACTIONS

     4.1.     REIT Restrictions

          (a) Taxable REIT Subsidiary Election. Effective as of January 1, 2001
and for so long thereafter as CarrAmerica continues to make the election to be
taxed as a real estate investment trust ("REIT") under Sections 856 through 860
of the Code, the Company and any corporation in which the Company owns at least
35% of vote or value of the stock (including OmniOffices (UK) Limited, a company
incorporated in England, and OmniOffices (Lux) 1929 Holding Company S.A., a
company organized under the laws of the Grand Duchy of Luxembourg), shall elect
to be treated as a "taxable REIT subsidiary" pursuant to Section 856(l) of the
Code. If CarrAmerica's ownership of the Common Stock of the Company is (i)
reduced below five percent (5%) for a continuous period of six months or longer
or (ii) is reduced below ten percent (10%) for a continuous period of twelve
months or longer, CarrAmerica shall, at the request of the Company, consent to
the revocation of such election for the first taxable year following the taxable
year in which the last month of such six month or twelve month period, as
applicable, occurs.

          (b) Ten Percent Voting Securities Limitation.

               (i) From the period commencing on the date hereof and ending on
January 1, 2001, the Company shall not undertake any transaction (including,
without limitation, a merger, reorganization, recapitalization, stock dividend,
split-off, stock repurchase or otherwise) that would result in CarrAmerica
owning (or being deemed for own) more that 10% of the outstanding "voting
securities" of any issuer (as determined under Section 856(c)(4)(B) of the
Code). For these purposes, in no event shall CarrAmerica be deemed to own voting
securities of an issuer merely as a result of the ownership of such securities
by the Company or by an entity in which the Company owns an interest.
Notwithstanding the foregoing, if the exception in Section 856(c)(4)(B)(iii)
with respect to stock of "taxable REIT subsidiaries" which was enacted as part
of the RMA, and is to become effective on January 1, 2001, is repealed, the
prohibitions contained in this paragraph (b) shall not expire on January 1,
2001, but shall continue to apply (x) if such repeal occurs prior to June 16,
2002, through the date (the "Put Expiration Date") that is either (I) if
CarrAmerica does not exercise its 2002 Put Right, June 15, 2002, or (II) if
CarrAmerica exercises its 2002 Put Right, July 31, 2002, or (y) if such repeal
occurs on or after June 16, 2002, then, if CarrAmerica is a REIT and still holds
securities of the Company, until 30 days following the first to occur of (I) an
IPO, (II) the acquisition of the Company by a publicly-traded company, or (III)
such other transaction pursuant to which the Company securities held by
CarrAmerica become or are exchanged for securities of a publicly traded company,
provided that, in the case of any transaction described in clause (I) or (III)
above in which CarrAmerica is required (or at the request of the Company agrees)
to enter into a lock-up, whether pursuant to Section 8.5 or otherwise, the
commencement of the 30 days shall begin on the last day of such lock-up period.
For these purposes, the relevant provision of the Code shall be considered to
have been repealed upon the passage of legislation that would repeal such
provision by both houses of Congress (prior to such legislation being signed
into law and regardless of whether such passage occurs prior to the effective
date of such legislation). In no event shall the provisions of this paragraph
apply to a transaction that takes place or to which the Company becomes
contractually committed after December 31, 2000 but prior to the repeal of
Section 856(c)(4)(B)(iii) (determined as set forth in the preceding sentence).

               (ii) In the event of any transaction that would otherwise result
in a violation of this paragraph (b), the Company shall have the option to cause
CarrAmerica to be offered and, if offered, CarrAmerica shall accept,
consideration in the form of nonvoting securities rather than voting securities
to the extent necessary to reduce CarrAmerica's voting interest to no more than
10% of the outstanding voting securities of such issuer; provided, however, that
CarrAmerica shall be required to accept such nonvoting securities (or waive the
restrictions set forth in this paragraph (b)) only if (x) such nonvoting
securities have economic terms that are at least as favorable to CarrAmerica as
the economic terms of the voting securities that would otherwise be received by
CarrAmerica, (y) CarrAmerica receives an opinion of nationally recognized tax
counsel to the effect that the securities to be received will not be treated as
voting securities for purposes of Section 856(c)(4) of the Code, and (z) the
nonvoting securities shall be convertible into voting securities under the same
circumstances that the Nonvoting Common Stock is convertible into Voting Common
Stock.

          (c) Limitation on Acquisition of Securities.

               (i) The Company shall not undertake any transaction (including,
without limitation, a merger, reorganization, distribution of securities, or
otherwise) prior to the Put Expiration Date that would cause CarrAmerica to be
considered to have acquired (as determined for purposes of Section 856(c)(4)(B)
of the Code) any security of any issuer if, as a result thereof and immediately
after such transaction, CarrAmerica would not meet one or more of the assets
tests set forth in Section 856(c)(4) of the Code (the "Asset Tests").

               (ii) For purposes of determining whether a violation of one or
more of the Asset Tests would occur for purposes of subparagraph (i) above, (A)
the date of the transaction shall be treated as if it were the last day of the
calendar quarter in which the transaction would occur, (B) the value of
securities that CarrAmerica would be considered to have acquired in connection
with the transaction for purposes of the Asset Tests shall be deemed to be the
value of such securities as of the date of the transaction, increased to reflect
deemed appreciation in value at an annual rate of 25%, for the period of time
from the date of the transaction to the close of the calendar quarter in which
the transaction takes place, and (C) CarrAmerica shall be treated as having
acquired or disposed of, as the case may be, on the date of the transaction any
other assets that CarrAmerica is contractually committed, on the later of the
time it receives written notice of the transaction or twenty (20) business days
prior to the transaction, to acquire or dispose of, as the case may be, at some
future date during such calendar quarter.

               (iii) The Company shall have the option to provide to CarrAmerica
at least twenty (20) business days' prior notice of a potential transaction that
could be subject to the prohibition in this Section 4.1(c). Such notice shall
contain a detailed description of the potential transaction, including the
maximum reasonably expected value of any securities to be received by
CarrAmerica in connection with such transaction as of the date the transaction
is expected to be completed. If the Company provides such notice to CarrAmerica,
CarrAmerica may, within ten (10) business days after receipt of such notice,
provide the Company an opinion of counsel or its independent accountants to the
effect that the execution of such transaction (taking into account the
principles set forth in subparagraph (ii) above) would reasonably be expected to
result in a violation of one or more of the Asset Tests (which opinion may be
based upon customary representations of CarrAmerica as to factual matters). If
the Company shall provide such notice to CarrAmerica, and CarrAmerica shall fail
to deliver such an opinion within the requisite ten (10) business days, the
Company shall be entitled to complete such transaction without any liability
under this subparagraph (c).

               (iv) From and after the Put Expiration Date through December 31,
2003, so long as CarrAmerica owns any securities of the Company, the Company
shall provide to CarrAmerica twenty (20) business days' prior notice of any
transaction involving the Company that would result in CarrAmerica being deemed
to have acquired additional securities of any issuer for purposes of Section
856(c)(4) of the Code, provided that such notice would not violate any
confidentiality obligations of the Company. If the notice requirement set forth
in this subparagraph (iv) would violate any confidentiality obligations of the
Company, the Company shall use commercially reasonable efforts to obtain an
exception to such confidentiality requirements in order to provide the notice to
CarrAmerica.

               (v) CarrAmerica shall maintain strict confidentiality with
respect to any potential transaction of which it receives notice under
subparagraph (iii) or subparagraph (iv) above, and CarrAmerica shall join in any
confidentiality obligations to which the Company is subject with respect to such
transaction.

               (vi) Notwithstanding any of the above, in the event of any
transaction that would otherwise result in a violation of this subparagraph (c),
CarrAmerica shall (x) accept consideration in the form of cash rather than
securities (or waive the restrictions set forth in this paragraph (c));
provided, that CarrAmerica shall not be obligated to accept cash (or waive the
restrictions set forth in this paragraph (c)) if the receipt of such cash would
reasonably be expected to cause CarrAmerica to violate any of the income tests
set forth in Section 856(c)(2) or 856(c)(3) of the Code for either of the
taxable years ending December 31, 2000 or December 31, 2001; and (y) at the
request of the Company, join to elect that the Company (or any successor) be
treated as a "taxable REIT subsidiary" of CarrAmerica (to the extent that such
an election is not then in effect and would be effective to avoid a violation of
this paragraph (c) or to minimize the amount of cash that CarrAmerica must
receive in order to avoid a violation of this paragraph (c)).

          (d) Limitations on Transactions that Produce Gain.

               (i) The Company shall not undertake any transaction (including,
without limitation, a dividend, merger, reorganization, distribution of
securities, or otherwise) (A) that shall result in the recognition of more than
$25 million of taxable income or gain by CarrAmerica during the taxable year
ending December 31, 2000 (in addition to any gain that will be recognized by
CarrAmerica by reason of the consummation of the transactions contemplated by
the Merger Agreement (the "Merger Agreement") dated as of January 20, 2000, by
and among the Company, CarrAmerica, RSI and Vantas Incorporated, a Nevada
corporation, and all ancillary agreements related thereto), or (B) that shall
result in the recognition of more than $75 million of taxable income or gain for
CarrAmerica during the taxable year ending December 31, 2001.

               (ii) In the event that the Company contemplates undertaking any
transaction (including, without limitation, a dividend, merger, reorganization,
distribution of securities, or otherwise) that is reasonably likely to result in
the recognition of taxable income or gain for CarrAmerica in any single calendar
year through 2003 that equals or exceeds $25 million (other than any gain that
will be recognized by CarrAmerica by reason of the consummation of the
transactions contemplated by the Merger Agreement and all ancillary agreements
related thereto), the Company shall provide CarrAmerica with not less than
seventy-five (75) calendar days' prior written notice thereof; provided,
however, that if using commercially reasonable efforts it is not practicable for
the Company to provide at least seventy-five (75) calendar days prior written
notice of such proposed transaction, then the Company shall provide written
notice to CarrAmerica as soon as practicable prior to the proposed transaction,
but in no event less than thirty (30) calendar days prior to the transaction,
provided further, that such notice would not violate any confidentiality
obligations of the Company. If the notice requirement set forth in this
subparagraph (ii) would violate any confidentiality obligations of the Company,
the Company shall use commercially reasonable efforts to obtain an exception to
such confidentiality requirements in order to provide the required notice to
CarrAmerica.

               (iii) For purposes of this paragraph (d), the Company may assume
that CarrAmerica's aggregate adjusted tax basis in its Common Stock is $20 per
share.

               (iv) Failure by CarrAmerica to cooperate fully and promptly with
respect to any reasonable request made by the Company for information in order
to determine the applicability of this paragraph (d) to any potential
transaction under consideration by the Company shall relieve the Company from
its obligations under this paragraph (d).

               (v) CarrAmerica shall maintain strict confidentiality with
respect to any potential transaction of which it receives notice hereunder, and
CarrAmerica shall join in any confidentiality obligations to which the Company
is subject with respect to such transaction.

          (e) Successors and Assigns. For purposes of this Section 4.1, the term
"Company" refers both to the Company itself and to all successors and assigns
(direct or indirect) of the Company (including, without limitation, any entity
that acquires some or all of the outstanding capital stock of the Company by
reason of a merger or otherwise in which CarrAmerica thereafter would own
securities of such acquiror or any affiliate thereof), and any direct or
indirect subsidiaries of the Company (or such a successor or assign thereto).
This Section 4.1(e) is included to avoid any ambiguity in the interpretation of
this Section 4.1 and shall not limit or otherwise affect the generality of
Sections 11.2, 11.5 and 11.6 or the interpretation of other Sections of this
Agreement.

     4.2.     No Acquisition of Common Stock from RSI or its Affiliates

          Without a Majority Consent of the Holders, the Company shall
not redeem, purchase or otherwise acquire any of the Common Stock of the Company
held by RSI or any entity controlled by RSI; provided, however, that no Majority
Consent of the Holders shall be required if such redemption, purchase or
acquisition is pursuant to a tender offer or other offer made on the same terms
to all holders of Common Stock, including, without limitation, the Holders.

     4.3.     No Contravening Agreement

           Each of RSI, each Holder and the Company covenants that, from
and after the date hereof, it will not enter into any contract, agreement or
other arrangement that would impair, limit or restrict its ability to perform
any of its obligations under this Agreement.

     4.4.     Termination

          The rights granted to Holders pursuant to Section 4.2 shall terminate
on the closing date of an IPO.

5.   PARTICIPATION RIGHTS

     5.1.     Right to Participate

          Subject to Section 5.6 hereof, from and after the date hereof, if the
Company proposes to issue or sell any equity securities of the Company or
securities convertible into equity securities of the Company ("Company
Interests") other than Company Interests issued pursuant to employee benefit
plans approved by the Company's stockholders, each Holder and RSI (each a
"Participant" and collectively, the "Participants") shall have the right to
purchase or subscribe for its "pro rata share" (as defined below), and no less
than all of such Participant's pro rata share, of such Company Interests;
provided, however, each Participant shall be entitled, on one (1) occasion only,
to purchase or subscribe for less than all of such Participant's pro rata share
or not to participate in such issuance or sale. For purposes of this Section
5.1, each Participant's "pro rata share" of the Company Interests to be issued
or sold in a transaction giving rise to the participation rights described in
this Section 5.1 (inclusive of the Company Interests to be purchased or
subscribed for by all Participants pursuant to the participation rights provided
for by this Section 5.1) shall equal the percentage of outstanding Common Stock
owned by such Participant as of the date immediately preceding such issuance or
sale. Notwithstanding the foregoing, each Participant shall be permitted to
designate that any or all of the Company Interests that it is entitled to
purchase pursuant to this Section 5.1 shall be of a separate class or series
with the same designations, preferences and rights as the Company Interests
proposed to be issued, except that any such separate class or series (i) shall
have no voting rights except as required by law, and (ii) shall be convertible
into the Company Interests under the same circumstances that the Nonvoting
Common Stock is convertible into Voting Common Stock.

     5.2.     Notice

          If the Company proposes to issue any Company Interests in a
transaction giving rise to the participation rights provided for in Section 5.1,
the Company shall send a written notice (the "Participation Notice") to each
Participant setting forth (a) the number of the Company Interests which the
Company proposes to issue, (b) the price (before any commission or discount) at
which such the Company Interests are proposed to be issued (or, in the case of
an underwritten or privately placed offering in which the price is not known at
the time the Participation Notice is given, the method of determining such price
and an estimate thereof), (c) such Participant's "pro rata share" as of the date
of the Participation Notice, and (d) all other relevant information as to such
proposed transaction as may be necessary for each Participant to determine
whether or not to exercise the rights granted pursuant to Section 5.1. At any
time within ten (10) days after its receipt of the Participation Notice, each
Participant may exercise its participation rights to purchase or subscribe for
the Company Interests, as provided for in this Section 5, by so informing the
Company in writing (an "Exercise Notice"). Each Exercise Notice shall state the
percentage of the proposed sale or issuance that such Participant elects to
purchase. Each Exercise Notice shall be irrevocable, subject to the conditions
to the closing of the transaction giving rise to the participation right
provided for in Section 5.1.

     5.3.     Abandonment of Sale or Issuance

          The Company shall have the right, in its sole discretion, at all times
prior to consummation of any proposed issuance or sale giving rise to the
participation right granted by Section 5.1, to abandon, rescind, annul, withdraw
or otherwise terminate such issuance or sale, whereupon all participation rights
in respect of such proposed issuance or sale shall become null and void, and the
Company shall not have any liability or obligation to any Participant by virtue
of such abandonment, rescission, annulment, withdrawal or termination.

     5.4.     Terms of Sale

          The purchase or subscription by any Participant pursuant to Section
5.1 above shall be at the same price and such other terms and conditions,
including the date of sale or issuance, as are applicable to the purchasers or
subscribers of the Company Interests whose purchases or subscriptions give rise
to the participation rights, which price and other terms and conditions shall be
substantially as stated in the relevant Participation Notice (which standard
shall be satisfied if the price is not greater than 110% of the estimated price
set forth in the relevant Participation Notice); provided, however, that if the
consideration to be received by the Company in connection with the issuance of
the Company Interests giving rise to participation rights hereunder is other
than cash or cash equivalents, the price at which the participation rights may
be exercised shall be the price set forth in the Participation Notice or
determined in the manner set forth in the Participation Notice (which shall in
either event be the price as set forth in the agreement pursuant to which such
Company Interests are to be issued, with the consideration to be received
therefor being valued based upon the fair market value thereof); provided
further, that if the consideration to be received by the Company in connection
with the issuance of the Company Interests giving rise to participation rights
hereunder is other than cash or cash equivalents, and the fair market value of
the consideration to be received is not determinable, the price at which the
participation rights may be exercised shall, (i) in the event that shares of
capital stock with an established trading market are being issued or sold, be
the average ten-day trailing market price of such shares as of the date of
receipt of the Participation Notice, and (ii) in the event any other interests
are being issued or sold, be determined by reference to the amount set forth
above, adjusted as may be appropriate to reflect the relationship between those
interests with an established trading market and those interests to be issued in
the relevant transaction; and provided, finally, that in the event the purchases
or subscriptions giving rise to the participation rights are effected by an
offering of securities registered under the 1933 Act and in which offering it is
not practical in the judgment of the Company for the securities to be purchased
by any Participant to be included, such securities to be purchased by such
Participant or Participants will be purchased in a concurrent private placement
if legally permissible.

     5.5.     Timing of Sale

          If, with respect to any Participation Notice, any Participant fails to
deliver an Exercise Notice within the requisite time period, the Company shall
have one hundred fifty (150) days after the expiration of the time in which the
Exercise Notice is required to be delivered in which to sell or issue not more
than the number of the Company Interests described in the Participation Notice
and at a price and on terms not materially less favorable to the Company than
were set forth in the Participation Notice. If, at the end of one hundred fifty
(150) days following the expiration of the time in which the Exercise Notice is
required to be delivered, the Company has not completed the issuance or sale of
the Company Interests in accordance with the terms described in the
Participation Notice (or, in the case of the price, at a price which is at least
90% of the estimated price set forth in the Participation Notice, which price
shall be deemed not to be materially less favorable to the Company than the
price set forth in the Participation Notice), the Company shall again be
obligated to comply with the provisions of Section 5.2 with respect to, and
provide Participants with the opportunity to participate in, any proposed
issuance or sale of the Company Interests; provided, however, that
notwithstanding the foregoing, if the price at which such the Company Interests
is to be sold in an underwritten offering is not at least 90% of the estimated
price set forth in the Participation Notice, the Company may inform such
Participant or Participants of such fact and such Participant or Participants
shall be entitled to elect, by written notice delivered within two business days
following receipt of such notice from the Company, to participate in such
offering in accordance with the provisions of this Section 5.

     5.6.     Termination of Participation Right

          The participation rights granted to Participants pursuant to this
Section 5 shall terminate on the earlier of (i) with respect to each Participant
on an individual basis, the first date on which such Participant's ownership of
Common Stock of the Company, together with any shares of Common Stock
transferred by such Participant to a majority owned subsidiary or an Immediate
Family Member of such Participant and still owned by such transferee or any
other permitted transferee, shall have been (x) in the case of any Holder, less
than 90% of the number of shares of Common Stock of the Company set forth
opposite the name of such Holder on the signature page hereto (as the same may
be increased pursuant to a prior exercise of a participation right granted
pursuant to Section 5.1 and subject to adjustment in the event of stock splits,
stock dividends and similar events) for a continuous period of ninety (90) days,
and (y) in the case of RSI, less than 65% of the number of shares of Common
Stock of the Company set forth opposite RSI's name on the signature page hereto
(as the same may be increased pursuant to a prior exercise of a participation
right granted pursuant to Section 5.1 and subject to adjustment in the event of
stock splits, stock dividends and similar events), (ii) the closing date of an
IPO, or (iii) if such Participant has previously elected either to purchase or
subscribe for less than such Participant's pro rata share or not to participate
in such issuance or sale in accordance with the proviso set forth in the first
sentence of Section 5.1, the date on which the Company subsequently consummates
a transaction which was subject to this Section 5 and such Participant did not
elect to purchase or subscribe for all of its pro rata share of the Company
Interests. The participation rights granted pursuant to Section 5.1 shall not
apply to an IPO and shall not be assignable or transferable to a third party;
provided, however, that any party hereto that is an entity may assign its rights
and obligations pursuant to this Section 5 in connection with a transfer of all
or substantially all of its assets or a merger, consolidation or other similar
business combination transaction. Notwithstanding anything to the contrary
contained herein, if a Participant delivers an Exercise Notice to the Company,
and the Company has not otherwise abandoned the transaction to which the
Exercise Notice applies, and such Participant fails to fulfill its obligations
to purchase the shares set forth in the Exercise Notice on the date set for
closing the transaction to which the Exercise Notice applies, such Participant's
rights under this Section 5 will terminate and such Participant shall pay to the
Company any expenses (including reasonable attorneys' fees) incurred by the
Company in connection with the transaction with the Participant.

6.   TAG-ALONG RIGHTS

     6.1.     Rights and Notice

          Subject to Section 6.4 of this Agreement and the last sentence of this
Section 6.1, if RSI receives a bona fide offer to purchase from it, whether in
one transaction or in a series of related transactions, shares of Common Stock
of the Company from any person other than an Affiliate of RSI (a "Purchase
Offer"), RSI shall not accept such Purchase Offer unless each of the Holders is
entitled to sell pursuant to the Purchase Offer that percentage of the shares of
Common Stock owned by such Holder equal to the percentage of the number of
shares of Common Stock owned by RSI proposed to be included in the Purchase
Offer. Sales by the Holders pursuant to the Purchase Offer shall be on the same
terms and conditions as the Purchase Offer, without reduction for minority
interest, absence of voting rights, illiquidity or otherwise. Not later than
fifteen (15) days prior to consummation of the Purchase Offer, RSI shall send a
notice (the "Tag-Along Notice") to each Holder, which notice shall include,
among other things, (a) the number of shares of Common Stock that are the
subject of the Purchase Offer, (b) the price at which the bona fide purchaser is
willing to purchase the Common Stock, and (c) all other relevant information as
to such proposed transaction as may be necessary for each Holder to determine
whether or not to exercise the Tag-Along Right. Upon receipt of the Tag-Along
Notice, each Holder shall have the right (the "Tag-Along Right") to sell in
accordance with the terms of the Purchase Offer up to the number of shares of
Common Stock equal to the product of (a) the total number of shares of Common
Stock proposed to be sold by all of the Holders pursuant to the Purchase Offer
and (b) a fraction, the numerator of which shall be the number of shares of
Common Stock owned by such Holder and the denominator of which shall be the
number of shares of Common Stock owned by all Holders electing to participate in
such purchase. A Holder may exercise the Tag-Along Right by delivering, not
later than ten (10) days after receipt of the Tag-Along Notice, a written notice
to RSI (a "Holder Tag-Along Notice") stating the number of shares of Common
Stock that such Holder wishes to sell pursuant to the Purchase Offer.
Notwithstanding the foregoing, RSI shall have the right to sell up to an
aggregate of twenty-five percent (25%) of the total number of shares of Common
Stock of the Company owned by RSI as of the date hereof (subject to future
adjustment in the event of stock splits, stock dividends and similar events)
prior to the second anniversary hereof without triggering any rights under this
Section 6.

     6.2.     Abandonment of Sale

          RSI shall have the right, in its sole discretion, at all times prior
to consummation of the proposed transaction giving rise to the Tag-Along Rights,
to abandon, withdraw or otherwise terminate its participation in the proposed
transaction, and RSI shall not have any liability or obligation to the Holders
as a result of such abandonment, withdrawal or other termination.

     6.3.     Timing of Sale

          If any Holder fails to deliver a Holder Tag-Along Notice within the
requisite time period, RSI shall have one hundred fifty (150) days after the
expiration of the time in which the Holder Tag-Along Notice is required to be
delivered to consummate the proposed transaction identified in the Holder
Purchase Offer at the price and on the terms that are not more favorable to RSI
than those set forth in the Holder Tag-Along Notice (except that the price may
be increased by up to 10% from the price set forth in the Holder Tag-Along
Notice). If, at the end of such one hundred fifty (150)-day period, RSI has not
consummated the proposed transaction, RSI shall again be obligated to comply
with the provisions of this Section 6.

     6.4.     Termination of Tag-Along Right

          The Tag-Along Rights granted to Holders pursuant to this Section 6
shall terminate upon the closing of an IPO.

7.   PUT RIGHTS

     7.1.     2000 Put Right

          (a) 2000 Put Right. At any time during the period commencing
on October 31, 2000 and ending on November 15, 2000 (the "2000 Put Period"),
each Holder shall have the right (the "2000 Put Right") to require that RSI
purchase up to [__%][percentage to be equal to (i) the amount by which the total
dollar value of the Common Stock held by all Holders immediately following the
Closing exceeds $100 million, divided by (ii) the total dollar value of the
Common Stock held by all Holders immediately following the Closing] of the
Common Stock owned by such Holder, for a price per share equal to the 2000 Put
Price (as defined below). The "2000 Put Price" of each share of Common Stock to
be sold pursuant to the 2000 Put Right shall be the greater of: (i) the Fair
Market Value (as defined below) of such Common Stock, determined in accordance
with the procedures set forth Section 7.4; (ii) the Consideration (as defined in
the U.S. Stock Purchase Agreement, subject to future adjustment in the event of
stock splits, stock dividends and similar events); or (iii) the highest price
per share of Common Stock (or the implied value of the Common Stock in
connection with the issuance of any convertible security of the Company)
(subject to future adjustment in the event of stock splits, stock dividends and
similar events) received by RSI or the Company in any sale or issuance thereof
from and after the date hereof through the last day of the 2000 Put Period. Each
Holder electing to exercise the 2000 Put Right (a "2000 Put Exercising Holder")
shall exercise such right by a written notice (the "2000 Put Notice") delivered
to RSI and the Company during the 2000 Put Period.

          (b) Consideration.

               (i) Cash. The consummation of the sale and purchase of Common
Stock pursuant to Section 7.1(a) shall occur on December 7, 2000 (the "2000 Put
Right Closing"). RSI shall pay the 2000 Put Price in cash in full at the 2000
Put Right Closing unless it elects the alternative consideration payment set
forth in clause (ii) below. The Designated Holder (as defined below) shall have
the right to inquire by notice to RSI as to the form of the consideration to be
paid by RSI at any time from the twelfth day prior to the 2000 Put Right Closing
up to and including the fifth day preceding the 2000 Put Right Closing. RSI
shall inform the Designated Holder of the form of the consideration not later
than the second day prior to the 2000 Put Right Closing. If RSI fails to so
inform the Designated Holder, RSI shall be responsible for any actual damages
incurred by the Holders as a result of such failure.

               (ii) Alternative Consideration - RSI Stock. Subject to the
following sentence, at RSI's option, all or a portion of the consideration
payable upon exercise of the 2000 Put Right may be paid by delivery of a number
of shares of common stock of RSI equal to (x) the 2000 Put Price, less any cash
paid pursuant to Section 7.1(b)(i) hereof, divided by (y) 98% of the volume
weighted average price of a share of common stock of RSI on the NASDAQ Stock
Market or other national securities exchange on which RSI's shares are then
traded for the ten (10) trading days ending on the third trading day prior to
the date of the 2000 Put Right Closing. RSI may pay all or a portion of the 2000
Put Price in shares of common stock of RSI only if (i) RSI's common stock is
then listed on the NASDAQ Stock Market or other national securities exchange on
which RSI's shares are then traded, and (ii) the shares to be issued to the 2000
Put Exercising Holder shall be eligible for immediate sale, subject to a resale
registration statement under the 1933 Act being declared effective by the SEC.
RSI covenants and agrees that it will file within thirty (30) days after receipt
of such 2000 Put Notice and will use its best efforts to have declared effective
within ninety (90) days of receipt of such 2000 Put Notice a resale registration
statement for the RSI common stock issued pursuant hereto.

          (c) Minimum Put Requirement. No exercise by any Holder of the 2000 Put
Right shall be permitted unless such exercise is with respect to the lesser of
(i) 200,000 shares of Common Stock or (ii) all of the shares of Common Stock
owned by such Holder.

     7.2.     2001 Put Right

          (a) 2001 Put Right. Unless an IPO has occurred prior to July
31, 2001, at any time during the period commencing on October 31, 2001 and
ending on November 15, 2001 (the "2001 Put Period"), each Holder shall have the
right (the "2001 Put Right") to require that RSI purchase up to 50% of the
Common Stock owned by such Holder (but subject to the minimum put requirement
set forth in Section 7.2(c)), for a price per share equal to the Fair Market
Value of such Common Stock (the "2001 Put Price"), determined in accordance with
the procedures set forth in Section 7.4. Each Holder electing to exercise the
2001 Put Right (a "2001 Put Exercising Holder") shall exercise such right by a
written notice (the "2001 Put Notice") delivered to RSI and the Company during
the 2001 Put Period.

          (b) Consideration.

               (i) Cash. The consummation of each sale and purchase of Common
Stock pursuant to Section 7.2(a) shall occur on December 7, 2001 (the "2001 Put
Right Closing"). RSI shall pay the 2001 Put Price in cash in full at the 2001
Put Right Closing, unless it elects either (but not both) of the alternative
consideration payments set forth in clauses (ii) and (iii) below. The Designated
Holder (as defined below) shall have the right to inquire by notice to RSI as to
the form of the consideration to be paid by RSI at any time from the twelfth day
prior to the 2001 Put Right Closing up to and including the fifth day preceding
the 2001 Put Right Closing. RSI shall inform the Designated Holder of the form
of the consideration not later than the second day prior to the 2001 Put Right
Closing. If RSI fails to so inform the Designated Holder, RSI shall be
responsible for any actual damages incurred by the Holders as a result of such
failure.

               (ii) Alternative Consideration - Promissory Note. At RSI's
option, all or a portion of the consideration payable upon exercise of the 2001
Put Right may be paid by delivery of a promissory note (the "Note") payable in
cash to a 2001 Put Exercising Holder in the amount of the 2001 Put Price payable
to such 2001 Put Exercising Holder, less any cash paid pursuant to Section
7.2(b)(i). The Note shall mature on July 31, 2002, shall be non-interest
bearing, and shall be prepayable at any time, at RSI's option.

               (iii) Alternative Consideration - RSI Stock. Subject to the
following sentence, at RSI's option, all or a portion of the consideration
payable upon exercise of the 2001 Put Right may be paid by delivery of a number
of shares of common stock of RSI equal to (x) the 2001 Put Price, less any cash
paid pursuant to Section 7.2(b)(i) hereof, divided by (y) 98% of the volume
weighted average price of a share of common stock of RSI on the NASDAQ Stock
Market or other national securities exchange on which RSI's shares are then
traded for the ten (10) trading days ending on the third trading day prior to
the date of the 2001 Put Right Closing. RSI may pay all or a portion of the 2001
Put Price in shares of common stock of RSI only if (i) RSI's common stock is
then listed on the NASDAQ Stock Market or other national securities exchange on
which RSI's shares are then traded, and (ii) the shares to be issued to the 2001
Put Exercising Holder shall be eligible for immediate sale, subject to a resale
registration statement under the 1933 Act being declared effective by the SEC.
RSI covenants and agrees that it will file within thirty (30) days after receipt
of such 2001 Put Notice and will use its best efforts to have declared effective
within ninety (90) days of receipt of such 2001 Put Notice a resale registration
statement for the RSI common stock issued pursuant hereto.

          (c) Minimum Put Requirement. No exercise by any Holder of the 2001 Put
Right shall be permitted unless such exercise is with respect to the lesser of
(i) 200,000 shares of Common Stock or (ii) all of the shares of Common Stock
owned by such Holder.

     7.3.     2002 Put Right

          (a) 2002 Put Right. Unless an IPO has occurred prior to April 1, 2002,
at any time during the period commencing on May 31, 2002 and ending on June 17,
2002 (the "2002 Put Period" and, together with the 2000 Put Period and the 2001
Put Period, a "Put Period"), each Holder shall have the right (the "2002 Put
Right") to require that RSI purchase any or all of the Common Stock owned by
such Holder (but subject to the minimum put requirement set forth in Section
7.3(c)), for a price per share equal to the Fair Market Value of such Common
Stock (the "2002 Put Price"), determined in accordance with the procedures set
forth in Section 7.4. Each Holder electing to exercise the 2002 Put Right (a
"2002 Put Exercising Holder" and together with a 2001 Put Exercising Holder, the
"Exercising Holders") shall exercise such right by a written notice (the "2002
Put Notice") delivered to RSI during the 2002 Put Period.

          (b) Consideration.

               (i) Cash. The consummation of each sale and purchase of Common
Stock pursuant to Section 7.3(a) shall occur on July 31, 2002 (the "2002 Put
Right Closing"). RSI shall pay the 2002 Put Price in cash in full at the 2002
Put Right Closing, unless it elects the alternative consideration payment set
forth in clause (ii) below. The Designated Holder (as defined below) shall have
the right to inquire by notice to RSI as to the form of the consideration to be
paid by RSI at any time from the twelfth day prior to the 2002 Put Right Closing
up to and including the fifth day preceding the 2002 Put Right Closing. RSI
shall inform the Designated Holder of the form of the consideration not later
than the second day prior to the 2002 Put Right Closing. If RSI fails to so
inform the Designated Holder, RSI shall be responsible for any actual damages
incurred by the Holders as a result of such failure.

               (ii) Alternative Consideration. Subject to the following
sentence, at RSI's option, all or a portion of the consideration payable upon
exercise of the 2002 Put Right may be paid by delivery of a number of shares of
common stock of RSI equal to (x) the 2002 Put Price, less any cash paid pursuant
to Section 7.3(b)(i) hereof, divided by (y) 98% of the volume weighted average
price of a share of common stock of RSI on the NASDAQ Stock Market or other
national securities exchange on which RSI's shares are then traded for the ten
(10) trading days ending on the third trading day prior to the date of the 2002
Put Right Closing. RSI may pay all or a portion of the 2002 Put Price in shares
of common stock of RSI only if (i) RSI's common stock is then listed on the
NASDAQ Stock Market or other national securities exchange on which RSI's shares
are then traded, and (ii) the shares to be issued to the 2002 Put Exercising
Holder shall be eligible for immediate sale, subject to a resale registration
statement under the 1933 Act being declared effective by the SEC. RSI covenants
and agrees that it will file within thirty (30) days after receipt of such 2002
Put Notice and will use its best efforts to have declared effective within
ninety (90) days of receipt of such 2002 Put Notice a resale registration
statement for the RSI common stock issued pursuant hereto.

          (c) Minimum Put Requirement. No exercise by any Holder of the 2002 Put
Right shall be permitted unless such exercise is with respect to the lesser of
(i) 200,000 shares of Common Stock or (ii) all of the shares of Common Stock
owned by such Holder.

     7.4.     Procedures to Determine Fair Market Value

          (a) Not later than sixty (60) days prior to the commencement of a Put
Period, the Designated Holder, on behalf of all Holders, and RSI shall each
select an independent investment banking firm of nationally recognized expertise
in the valuation of companies comparable to the Company. The agreement pursuant
to which each such firm is retained shall require such firm to deliver to each
of the Designated Holder and RSI a valuation report setting forth its
determination of the total equity value of the Company not later than thirty
(30) days prior to the commencement of a Put Period. The total equity value
shall be calculated as of October 31, 2000 (in the case of the 2000 Put Right),
October 31, 2001 (in the case of the 2001 Put Right) or May 31, 2002 (in the
case of the 2002 Put Right). If the lower valuation of the two investment
banking firms so selected by the Designated Holder and RSI is 90% or more of the
higher valuation, then the average of two valuations shall be considered the
"total equity value" of the Company for purposes of this Section 7.4. If the
lower valuation is not at least 90% of the higher valuation, then such
investment banking firms shall select a third independent investment banking
firm of nationally recognized expertise in the valuation of companies comparable
to the Company, which shall choose, not later than the commencement of a Put
Period, one of the values determined by the investment banking firms so selected
by the Designated Holder and RSI, which shall be the "total equity value" of the
Company for purposes of this Section 7.4. Any determination of the "total equity
value" of the Company in accordance with the provisions of this paragraph shall
be final and binding. The costs of the investment bankers retained in accordance
with this Section 7.4 shall be borne equally by RSI and the Exercising Holders
(pro rata based on the respective number of shares sold), or, in the case of the
2000 Put Right or if there shall be no Exercising Holders, equally by RSI and
CarrAmerica. The "Fair Market Value" of each share of Common Stock for purposes
of determining the 2000 Put Price, the 2001 Put Price or the 2002 Put Price, as
applicable, shall be determined by dividing (i) the total equity value of the
Company as of October 31, 2000 (in the case of the 2000 Put Right), October 31,
2001 (in the case of the 2001 Put Right) or May 31, 2002 (in the case of the
2002 Put Right), as determined in the manner described above, by (ii) the number
of shares of Common Stock outstanding as of October 31, 2000, October 31, 2001
or May 31, 2002, as applicable (including any securities convertible into Common
Stock calculated on a fully diluted basis). The Fair Market Value of each share
of Common Stock shall be determined without giving effect to any factor
specifically relating to the Common Stock, including, without limitation,
liquidity premiums or discounts relating to the Common Stock, minority position
or lack of voting power.

          (b) During the 2000 Put Period, the 2001 Put Period, the 2002 Put
Period and the ten trading days ending on the 3rd business day prior to the date
of the applicable Put Right Closing (each such period, a "Measuring Period"),
neither CarrAmerica nor any of its controlled Affiliates shall, directly or
indirectly, engage in short sales of (and, during the ten trading days prior to
the date of the applicable Put Right Closing, engage in sales of), or purchase
put options on, shares of RSI common stock or securities convertible into or
exchangeable for shares of RSI common stock, or otherwise enter into or execute
hedging or arbitrage transactions on the NASDAQ Stock Market, or on any national
securities exchange on which RSI common stock is listed or with third party
intermediaries with the purpose or intention, or having the effect, of
decreasing the market price of RSI common stock during each Measuring Period.

     7.5.     Indemnification of Designated Holder

          Each Holder hereby irrevocably appoints the Designated Holder as its
representative under Section 7 hereof for purposes of determining the Fair
Market Value of the Common Stock. Each Holder hereby indemnifies the Designated
Holder for, and holds the Designated Holder harmless against, any loss,
liability, disbursements, expenses, losses, costs or cash damages (including
reasonable attorneys' fees) incurred on the part of the Designated Holder,
arising out of or in connection with Designated Holder carrying out its duties
herein, including costs and expenses of defending the Designated Holder against
any claim of liability with respect thereto, provided that the Designated Holder
has acted in good faith.

8.   TRANSFER RESTRICTIONS

     8.1.     RSI Right of First Offer

          (a) Subject to Section 8.4 hereof, before any Holder shall transfer
any shares of capital stock of the Company, such Holder shall first deliver a
written notice (the "Holder Notice of Offer") to RSI offering to sell the number
of shares proposed to be sold by such Holder to RSI (the "RSI Right of First
Offer"). The Holder Notice of Offer shall specify (i) the number and classes of
all shares of Common Stock proposed to be sold by such Holder to RSI (the
"Holder Offered Securities"), (ii) the minimum proposed cash consideration per
share that Holder desires to receive for the Holder Offered Securities (the
"Holder Offer Price"), and (iii) any other terms and conditions of the offer.
The Holder Notice of Offer shall constitute an irrevocable offer by such Holder
to sell to RSI all, but not less than all, of the Holder Offered Securities at
the Holder Offer Price, in accordance with this Section 8.

          (b) Within thirty (30) days following its receipt of the Holder Notice
of Offer, RSI shall notify such Holder whether it intends to exercise its right
to purchase all (but not less than all) of the Holder Offered Securities (the
"RSI Notification"). A RSI Notification that indicates that RSI intends to
purchase the Holder Offered Securities shall be deemed to be an irrevocable
commitment of RSI to purchase the Holder Offered Securities. Should RSI elect to
exercise the RSI Right of First Offer, the RSI Notification shall include a
subscription for the offered shares and RSI shall purchase the Holder Offered
Securities on the date for closing specified in the Holder Notice of Offer,
which date shall be no less than thirty (30) days after the date of the RSI
Notification. If RSI does not subscribe for and purchase all of the Holder
Offered Securities pursuant to this Section 8.1(b), such Holder may thereafter
sell the Holder Offered Securities to any third party on the terms and
conditions (including, but not limited to, the number of shares of Holder
Offered Securities and the Holder Offer Price) as specified in the Holder Notice
of Offer, provided, that such sale is consummated within one hundred fifty (150)
days of the date of the Holder Notice of Offer; and provided further, that the
fair market value of the price paid for such shares by a third party (which
price may consist of cash, securities, other non-cash consideration or a
combination thereof) is at least 90% of the Holder Offer Price. If the price to
be paid for such shares by a third party is payable in whole or in part in
consideration other than cash or securities traded on a national securities
exchange or the NASDAQ Stock Market, and RSI objects to the Holder's
determination of the cash fair market value of the non-cash portion of the
consideration, then such determination shall be made by (i) Goldman, Sachs &
Co., (ii) Merrill Lynch & Co., if Goldman, Sachs & Co. is unable or unwilling to
make such determination, or (iii) if neither of the foregoing firms is able or
willing to deliver such valuation, such other independent investment banking
firm or other qualified appraiser mutually agreeable to and promptly selected by
the Holder and RSI, such determination shall be final and binding on the
parties. After the expiration of such 150-day period, such Holder shall again
comply with the provisions of this Section 8.1 before selling any shares of the
Company.

     8.2.     Holder Right of First Offer

          (a) Subject to Section 8.4 hereof, the second sentence of this
paragraph and provided that the Holders collectively own at least 95% of the
total number of shares of Common Stock of the Company set forth opposite the
names of such Holders on the signature page hereto (subject to future adjustment
in the event of stock splits, stock dividends and similar events), if RSI
desires to transfer, in a single transaction or a series of related
transactions, a number of shares of Common Stock of the Company not in excess of
twenty percent (20%) of the total shares of Common Stock of the Company
outstanding as of such date, RSI shall first deliver a written notice (the "RSI
Notice of Offer") to the Designated Holder offering to sell the lesser of (i)
the number of shares proposed to be sold by RSI or (ii) 20% of the number of
shares of issued and outstanding Common Stock of the Company as of the date of
the RSI Notice of Offer, to Holders (the "Holder Right of First Offer" and,
together with the RSI Right of First Offer, the "Rights of First Offer").
Notwithstanding the foregoing, RSI shall have the right to sell up to an
aggregate of twenty-five percent (25%) of the total number of shares of Common
Stock of the Company owned by RSI as of the date hereof (subject to future
adjustment in the event of stock splits, stock dividends and similar events)
prior to the second anniversary hereof without triggering any rights under this
Section 8.2. The RSI Notice of Offer shall specify (i) the number and classes of
all shares of Common Stock proposed to be sold by RSI to the Holders (the "RSI
Offered Securities"), (ii) the minimum proposed cash consideration per share
that RSI desires to receive for the RSI Offered Securities (the "RSI Offer
Price"), and (iii) any other terms and conditions of the offer. The RSI Notice
of Offer shall constitute an irrevocable offer by RSI to sell to the
Participating Holders (as defined below), as the case may be, all, but not less
than all, of the RSI Offered Securities at the RSI Offer Price, in accordance
with this Section 8.2(a).

          (b) Within ten (10) days following its receipt of the RSI Notice of
Offer, the Designated Holder shall determine whether it intends to exercise its
right to purchase all (but not less than all) of the RSI Offered Securities. If
the Designated Holder elects to exercise the Holder Right of First Offer, it
shall send all of the other Holders a copy of the RSI Notice of Offer not later
than the eleventh (11th) day after the Designated Holder's receipt thereof. If,
but only if, the Designated Holder elects to exercise the Holder Right of First
Offer, each Holder shall have the right to purchase all, but not less than all,
of its "pro rata share" of the RSI Offered Securities. As used herein, a
Holder's "pro rata share" means a fraction, the numerator of which is the number
of shares of Common Stock owned by such Holder and the denominator of which is
the number of shares of Common Stock owned by all of the Holders (including the
Designated Holder). Each Holder shall have ten (10) days to notify the
Designated Holder of the number of shares such Holder elects to purchase
pursuant to the RSI Right of First Offer. Within thirty (30) days of receipt of
the RSI Notice of Offer, the Designated Holder shall notify RSI whether the
Holders are exercising the Holder Right of First Offer (the "Designated Holder
Notification"). A Designated Holder Notification that indicates that
Participating Holders intend to purchase the RSI Offered Securities shall be
deemed to be an irrevocable commitment of such Participating Holders to purchase
the RSI Offered Securities. Should all or any portion of the Holders (the
"Participating Holders") elect to exercise the Holder Right of First Offer, the
Designated Holder Notification shall include a subscription for the offered
shares and the Participating Holders shall purchase the Offered Securities on
the date for closing specified in the RSI Notice of Offer, which date shall be
no less than thirty (30) days after the date of the Designated Holder
Notification. If the Holders do not subscribe for and purchase all of the RSI
Offered Securities pursuant to this Section 8.2(b), RSI may thereafter sell the
RSI Offered Securities to any third party on the terms and conditions
(including, but not limited to, the number of shares of RSI Offered Securities
and the RSI Offer Price) as specified in the RSI Notice of Offer, provided, that
such sale is consummated within one hundred fifty (150) days of the date of the
RSI Notice of Offer; and provided further, that the fair market value of the
price paid for such shares by a third party (which price may consist of cash,
securities, other non-cash consideration or a combination thereof) is at least
90% of the RSI Offer Price. If the price to be paid for such shares by a third
party is payable in whole or in part in consideration other than cash or
securities traded on a national securities exchange or the NASDAQ Stock Market,
and Designated Holder objects to RSI's determination of the cash fair market
value of the non-cash portion of the consideration, then such determination
shall be made by (i) Goldman, Sachs & Co., (ii) Merrill Lynch & Co., if Goldman,
Sachs & Co. is unable or unwilling to make such determination, or (iii) if
neither of the foregoing firms is able or willing to deliver such valuation,
such other independent investment banking firm or other qualified appraiser
mutually agreeable to and promptly selected by the Designated Holder and RSI,
such determination shall be final and binding on the parties. After the
expiration of such 150-day period, RSI shall again comply with the provisions of
this Section 8.2 before selling any shares of the Company.

     8.3.     No Obligation to Purchase

          RSI shall not be obligated to purchase any Holder Offered Securities
pursuant to any Holder Notice of Offer in accordance with the provisions of
Section 8.1 and no Holder shall be obligated to purchase any RSI Offered
Securities pursuant to any RSI Notice of Offer in accordance with the provisions
of Section 8.2.

     8.4.     Termination of the Rights of First Offer

          The Rights of First Offer granted pursuant to this Section 8 shall
terminate upon the closing of an IPO.

     8.5.     IPO Lock-Up

          Each Holder hereby agrees, and will any cause any transferee who
acquires shares of Common Stock from Holder during the applicable period to
agree, that, if requested by the underwriters in connection with an IPO, such
Holder (or transferee) will agree not to sell, pledge, make any short sale of,
loan, grant any option for the purchase of any shares of Common Stock owned by
it (whether pursuant to a registration statement or otherwise) either through
the agency of a broker-dealer or the facilities of the national securities
exchange on which the Company's shares of Common Stock are listed for a
reasonable period following the IPO, such period not to exceed ninety (90) days.
If the Company determines in good faith that it would be advantageous to the
Company for any Holder to be subject to a lock-up in accordance with the terms
and conditions of the preceding sentence for a period in excess of ninety (90)
days, such Holder shall agree to such lock-up, not to exceed an additional
ninety (90) days; provided, that (i) such Holder shall be permitted to sell as a
selling stockholder in the IPO up to fifty percent (50%) (the exact amount to be
determined by such Holder) of the shares of Common Stock held by such Holder as
of the closing date of the IPO; (ii) RSI shall acquire, at the closing of the
IPO, up to fifty percent (50%) (the exact amount to be determined by such
Holder) of the shares of Common Stock held by such Holder as of the closing date
of the IPO, either (y) for cash at the IPO price, or (z) for a number of shares
of common stock of RSI equal to (A) the value of the shares of Common Stock
proposed to be sold by such Holder (such value being deemed equal to the initial
public offering price in the IPO), divided by (B) the average closing trading
price of a share of common stock of RSI on the NASDAQ Stock Market or other
national securities exchange on which RSI's shares are traded for the ten (10)
trading days ending on the third trading day prior to the closing date of the
IPO; provided that RSI's common stock is then listed on the NASDAQ Stock Market
or other national securities exchange on which RSI's shares are then traded, and
the shares to be issued to such Holder shall be eligible for immediate sale,
subject to a resale registration statement under the 1933 Act being declared
effective by the SEC; or (iii) any combination of (i) or (ii) above which
results in such Holder disposing of up to fifty percent (50%) (the exact amount
to be determined by such Holder) of its shares of Common Stock. With respect to
the proviso set forth in clause (ii) above, RSI covenants and agrees that it
will file within thirty (30) days after the closing of the IPO and will use its
best efforts to have declared effective within ninety (90) days after the
closing of the IPO a resale registration statement for the RSI common stock
issued pursuant hereto.

9.   LEASE GUARANTEE INDEMNIFICATION

          RSI indemnifies CarrAmerica for, and holds it harmless against, any
loss, liability, disbursements, expenses, losses, costs or cash damages
(including reasonable attorneys' fees) arising from and after the date hereof
and incurred by, arising out of or in connection with those certain guarantees
of Company obligations listed on Exhibit A, including costs and expenses of
defending CarrAmerica against any claim of liability with respect thereto.

10.  PURCHASE RIGHT AGREEMENT ANTI-DILUTION PROTECTION

          In the event of an IPO, the Company hereby assigns to CarrAmerica, and
CarrAmerica hereby assumes, the obligation of the Company to sell 100% of the
shares of Common Stock required to be sold under the Purchase Right Agreement,
dated as of March 4, 1998, among the Company, Robert A. Arcoro and Joseph
Kaidanow with respect to each percentage point decrease in the Debt Ratio (as
defined in such Purchase Right Agreement) below 55% and above and including 40%.

11.  MISCELLANEOUS

     11.1.    RSI Assurance

          RSI unconditionally, absolutely and irrevocably guarantees and assures
the due and punctual performance and observance by the Company of all terms,
covenants and conditions of Section 4.1 of this Agreement, whether according to
the present terms hereof or pursuant to any amendment in the terms, covenants
and conditions hereof now or at any time hereafter made or granted, and
regardless of whether recovery on such liability may be or hereafter become
barred by any statute of limitations or such liability may otherwise be or
become unenforceable; provided, that, such guarantee and assurance shall be
applicable to a transaction giving rise to a violation of Section 4.1(b), 4.1(c)
or 4.1(d) only to the extent such transaction has been approved by the Board,
and; provided, further, such guarantee shall terminate on the closing date of an
IPO.

     11.2.    Assignment

          None of the parties hereto shall be permitted to assign any of their
respective rights or obligations hereunder to any third party, except that each
Holder shall be permitted to assign its rights and obligations hereunder to any
other Person in connection with a transfer of shares of Common Stock by such
Holder made in accordance with Section 8 hereof; provided, that such Person
agrees to be bound by this Agreement; and provided further, that any party
hereto that is an entity may assign its rights and obligations hereunder in
connection with a transfer of all or substantially all of its assets or a
merger, consolidation or other similar business combination transaction. Any
agreement in violation hereof shall be void ab initio and of no force or effect.

     11.3.    Entire Agreement; Amendment

          This Agreement, including the Appendices and Exhibits hereto
and other writings referred to herein or delivered pursuant hereto, constitutes
the entire agreement among the parties hereto with respect to the transactions
contemplated herein, and it supersedes all prior oral or written agreements,
commitments or understandings with respect to the matters provided for herein.
No amendment, modification or discharge of this Agreement shall be valid or
binding unless set forth in writing and duly executed by the Company, RSI and a
Majority Consent of the Holders.

     11.4.    Waiver

          No delay or failure on the part of any party hereto in exercising any
right, power or privilege under this Agreement or under any other instruments
given in connection with or pursuant to this Agreement shall impair any such
right, power or privilege or be construed as a waiver of any default or any
acquiescence therein. No single or partial exercise of any such right, power or
privilege shall preclude the further exercise of such right, power or privilege,
or the exercise of any other right, power or privilege. No waiver shall be valid
against any party hereto unless made in writing and signed by the party against
whom enforcement of such waiver is sought and then only to the extent expressly
specified therein.

     11.5.    Limitation on Benefit

          It is the explicit intention of the parties hereto that no person or
entity other than the parties hereto is or shall be entitled to bring any action
to enforce any provision of this Agreement against any of the parties hereto and
their respective successors, heirs, executors, administrators, legal
representatives and permitted assigns, and the covenants, undertakings and
agreements set forth in this Agreement shall be solely for the benefit of, and
shall be enforceable only by, the parties hereto or their respective successors,
heirs, executors, administrators, legal representatives and permitted assigns.

     11.6.    Binding Effect

          This Agreement shall be binding upon and shall inure to the
benefit of the parties hereto and their respective successors, heirs, executors,
administrators, legal representatives and permitted assigns.

     11.7.    Governing Law

          This Agreement, the rights and obligations of the parties hereto, and
any claims or disputes relating thereto, shall be governed by and construed in
accordance with the laws of Delaware (excluding the choice of law rules
thereof).

     11.8.    Notices

          All notices, demands, requests, or other communications which
may be or are required to be given, served, or sent by any party to any other
party pursuant to this Agreement shall be in writing and shall be
hand-delivered, sent by documented overnight delivery service or mailed by
first-class, registered or certified mail, return receipt requested, postage
prepaid, or, to the extent receipt is confirmed, transmitted by telegram,
telecopy, facsimile or other electronic transmission or telex, addressed as
follows:

                  (i)      If to the Company:

                           HQ Global Workplaces, Inc.,
                           15950 North Dallas Parkway, Suite 400
                           Dallas, Texas 75248
                           Attn.: Jill B. Louis, General Counsel
                           Facsimile No.:  972/361-8101

                           with a copy (which shall not constitute notice) to:

                           Gibson, Dunn & Crutcher
                           1717 Main Street, Suite 5500
                           Dallas, Texas  75201
                           Attn.:  Harlan Cohen, Esq.
                           Facsimile No.:  214/698-3400

                  (ii)     If to RSI:

                           Reckson Service Industries, Inc.
                           10 East 50th Street
                           Suite 2700
                           New York, New York  10022-6881
                           Attn.:  Jason Barnett, General Counsel
                           Facsimile No.: 212/931-8001

                           with a copy (which shall not constitute notice) to:

                           Brown & Wood, LLP
                           One World Trade Center
                           New York, New York  10048-0057
                           Attn.:  Joseph W. Armbrust, Jr.
                                   J. Gerard Cummins
                           Facsimile No.: 212/839-5599

                  (iii)    If to CarrAmerica:

                           CarrAmerica Realty Corporation
                           1700 Pennsylvania Avenue, N.W.
                           Washington, D.C. 20006
                           Attn.:  Linda A. Madrid, General Counsel
                           Facsimile No.:  202/729-1160

                           with a copy (which shall not constitute notice) to:

                           Hogan & Hartson L.L.P.
                           Columbia Square
                           555 Thirteenth Street, N.W.
                           Washington, D.C. 20004-1109
                           Attn.:  J. Warren Gorrell, Jr.
                                   David W. Bonser
                           Facsimile No.:  202/637-5910

          Notice to each Holder, other than CarrAmerica, shall be delivered to
such Holder at the address indicated on the signature page hereof.

          Each party may designate by notice in writing a new address to which
any notice, demand, request, or communication may thereafter be so given, served
or sent. Each notice, demand, request, or communication which shall be
hand-delivered, sent by documented overnight delivery service, mailed,
transmitted, telecopied, faxed, e-mailed, or telexed in the manner described
above, or which shall be delivered to a telegraph company, shall be deemed
sufficiently given, served, sent, received, or delivered for all purposes at
such time as it is delivered to the addressee (with the return receipt, the
delivery receipt, or the answerback being deemed conclusive, but not exclusive,
evidence of such delivery) or at such time as delivery is refused by the
addressee upon presentation.

     11.9.   Headings

          Article and Section headings contained in this Agreement are inserted
for convenience of reference only, shall not be deemed to be a part of this
Agreement for any purpose, and shall not in any way define or affect the
meaning, construction or scope of any of the provisions thereof. All references
to Sections or Articles contained herein mean Sections or Articles of this
Agreement unless otherwise stated.

     11.10.   Execution in Counterparts

          To facilitate execution, this Agreement may be executed in as many
counterparts as may be required; and it shall not be necessary that the
signatures of, or on behalf of, each party, or that the signatures of all
persons required to bind any party, appear on each counterpart; but it shall be
sufficient that the signature of, or on behalf of, each party appear on one or
more of the counterparts. Copies of executed counterparts transmitted by
telecopy, facsimile or other electronic transmission service shall be considered
original executed counterparts for purposes of this Section 11.10; provided,
that receipt of copies of such counterparts is confirmed. All counterparts shall
collectively constitute a single agreement. It shall not be necessary in making
proof of this Agreement to produce or account for more than a number of
counterparts containing the respective signatures of, or on behalf of, all of
the parties hereto.

     11.11.   Interpretation; Absence of Presumption

          (a) For the purposes hereof, (i) words in the singular shall
be held to include the plural and vice versa and words of one gender shall be
held to include the other gender as the context requires, (ii) the terms
"hereof," "herein," and "herewith" and words of similar import shall, unless
otherwise stated, be construed to refer to this Agreement as a whole and not to
any particular provision of this Agreement, and Article, Section and paragraph
references are to the Articles, Sections and paragraphs to this Agreement unless
otherwise specified, (iii) the word "including" and words of similar import when
used in this Agreement shall mean "including, without limitation," unless the
context otherwise requires or unless otherwise specified, (iv) the word "or"
shall not be exclusive, and (v) provisions shall apply, when appropriate, to
successive events and transactions.

          (b) This Agreement shall be construed without regard to any
presumption or rule requiring construction or interpretation against the party
drafting or causing any instrument to be drafted.

     11.12.   Severability

          Any provision hereof which is invalid or unenforceable shall
be ineffective to the extent of such invalidity or unenforceability, without
affecting in any way the remaining provisions hereof.

     11.13.   Specific Performance

          Each of the Company, RSI and each Holder acknowledges that, in
view of the uniqueness of arrangements contemplated by this Agreement, the
parties hereto would not have an adequate remedy at law for money damages in the
event that this Agreement were not performed in accordance with its terms, and
therefore agrees that the parties hereto shall be entitled to specific
enforcement of the terms hereof in addition to any other remedy to which the
parties hereto may be entitled at law or in equity.

     11.14.   Consent to Jurisdiction

          Each party to this Agreement: (v) agrees to commence any action, suit
or proceeding relating hereto either in a federal court located in the State of
Delaware or in a Delaware state court; (w) irrevocably submits and consents to
personal jurisdiction in any such suit; (x) agrees that any service of process,
summons, notice or document delivered by U.S. registered mail to such party's
respective address set forth in Section 11.8 above shall be effective service of
process for any action, suit or proceeding in Delaware with respect to any
matters to which such party has submitted to jurisdiction in this Section 11.14;
(y) 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 (i) any Delaware state court or (ii) any
federal court located in the State of Delaware; and (z) 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. EACH PARTY TO THIS AGREEMENT IRREVOCABLY WAIVES TRIAL
BY JURY IN ANY ACTION OR PROCEEDING WITH RESPECT TO THIS AGREEMENT.

     11.15.   Litigation Costs

          If any litigation with respect to the obligations of the
parties under this Agreement results in a final nonappealable order of a court
of competent jurisdiction that results in a final disposition of such
litigation, the prevailing party, as determined by the court ordering such
disposition, shall be entitled to reasonable attorneys' fees as shall be
determined by such court. Contingent or other percentage compensation
arrangements shall not be considered reasonable attorneys' fees.

                            [signature pages follow]

<PAGE>

          IN WITNESS WHEREOF, this Agreement has been signed by or on behalf of
each of the parties hereto as of the day first above written.

                                      RECKSON SERVICE INDUSTRIES, INC.

                                      By:  _____________________________________
                                      Name: ____________________________________
                                      Title:  __________________________________
                                      Number of Shares of Common Stock
                                        Owned of Record: _______________________

                                      HQ GLOBAL WORKPLACES, INC.,

                                      By:  _____________________________________
                                      Name: ____________________________________
                                      Title:  __________________________________

                                      HOLDERS

                                      CARRAMERICA REALTY CORPORATION

                                      By:  _____________________________________
                                      Name: ____________________________________
                                      Title:  __________________________________
                                      Number of Shares of Common Stock
                                        Owned of Record: _______________________

                                      __________________________________________
                                      [Stockholder Name]
                                      Date of Execution:  ______________________
                                      Number of Shares of Common Stock
                                        Owned of Record:  ______________________

                                      __________________________________________
                                      [Stockholder Name]
                                      Date of Execution:  ______________________
                                      Number of Shares of Common Stock
                                        Owned of Record:  ______________________

                                      __________________________________________
                                      [Stockholder Name]
                                      Date of Execution:  ______________________
                                      Number of Shares of Common Stock
                                        Owned of Record:  ______________________

                                      __________________________________________
                                      [Stockholder Name]
                                      Date of Execution:  ______________________
                                      Number of Shares of Common Stock
                                        Owned of Record:  ______________________

                                      __________________________________________
                                      [Stockholder Name]
                                      Date of Execution:  ______________________
                                      Number of Shares of Common Stock
                                        Owned of Record:  ______________________

                                      __________________________________________
                                      [Stockholder Name]
                                      Date of Execution:  ______________________
                                      Number of Shares of Common Stock
                                        Owned of Record:  ______________________

<PAGE>

                                    EXHIBIT A
                                Lease Guarantees

1.       San Mateo
         Metro Corporation Center - Landlord
         1840 Gateway Drive, 2nd Floor
         Lease Ends:  3/31/05
         Renewal Option:  3/31/12

2.       San Jose
         Kattelus Development Corp. - Landlord
         2550 N. First St., Suite 301
         Lease Ends:  10/31/08
         Renewal Option:  10/31/13

3.       One Liberty Plaza
         New York, New York
         Bank of Nova Scotia - Landlord
         Lease Ends:  3/31/08
         Renewal Option:  9/30/13

4.       590 Madison Avenue
         590 Madison Avenue Associates L.P. - Landlord
         Lease Ends:  9/30/07
         Renewal Option:  None

<PAGE>

                                    EXHIBIT B---------------------------------------------------

                           STOCK PURCHASE AGREEMENT

                                    between

                        CARRAMERICA REALTY CORPORATION

                                      and

                       RECKSON SERVICE INDUSTRIES, INC.

              ---------------------------------------------------

                         Dated as of January 20, 2000

              ---------------------------------------------------

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                           STOCK PURCHASE AGREEMENT

         STOCK PURCHASE AGREEMENT dated as of January 20, 2000, by and among
CarrAmerica Realty Corporation, a Maryland corporation ("CarrAmerica" or
"Seller"), and any additional stockholders who become parties to this
Agreement pursuant to Section 24 hereof, on the one hand, and Reckson Service
Industries, Inc., a Delaware corporation (the "Buyer"), on the other hand.

         WHEREAS, Seller desires to sell to the Buyer, and the Buyer desires
to purchase from the Seller, a total of 4,226,116 shares of nonvoting common
stock, par value $.01 per share (the "Non-Voting Common Stock"), of HQ Global
Workplaces Inc., a Delaware corporation (the "Company") for an amount in cash
equal to $35.13 per share (such amount, as recalculated at Closing pursuant to
Annex A, the "Consideration"), such number of shares of Non-Voting Common
Stock being subject to adjustment as hereinafter provided.

         WHEREAS, simultaneously with the execution and delivery of this
Agreement, (i) HQ and CarrAmerica, on the one hand, and VANTAS Incorporated, a
Nevada Corporation ("VANTAS"), and Buyer, on the other hand, have entered into
an Agreement and Plan of Merger (the "Merger Agreement") that provides for the
merger, subject to and upon the terms and conditions set forth therein, of
VANTAS with and into the Company immediately prior to the closing of the
transactions contemplated hereby and (ii) CarrAmerica and VANTAS have entered
into that certain Stock Purchase Agreement providing for the acquisition,
subject to and upon the terms and conditions set forth therein, of certain
shares of nonvoting common stock of OmniOffices (UK) Limited ("Omni UK") and
OmniOffices (Lux) 1929 Holding Company S.A. ("LuxCo") owned by CarrAmerica and
certain promissory notes evidencing loans made by CarrAmerica to Omni UK and
LuxCo simultaneously with the closing of the transactions contemplated hereby.

         WHEREAS, capitalized words and phrases used but not otherwise defined
herein shall have the meanings ascribed to them under the Merger Agreement.

         Accordingly, the Seller and the Buyer hereby agree as follows:

         1. Purchase and Sale of the Shares. On the terms and subject to the
conditions of this Agreement, Seller shall sell, transfer and deliver or cause
to be sold, transferred and delivered to the Buyer, and the Buyer shall
purchase from Seller, free and clear of all liens, charges, claims, rights and
encumbrances of any kind, the number of shares of Non-Voting Common Stock set
forth opposite Seller's name on Exhibit A attached hereto (for Seller, such
number of shares being Seller's "Shares") for the Consideration, payable as
set forth below in Section 2.

         2. Closing. The closing (the "Closing") of the purchase and sale of
the Shares shall be held at the offices of Brown & Wood LLP, One World Trade
Center, New York, New York 10048, immediately after and on the same date as
the Closing under the Merger Agreement, subject to the satisfaction or waiver
of the conditions set forth in Section 8 hereof. The date on which the Closing
shall occur is hereinafter referred to as the "Closing Date." At the Closing,
(i) the Buyer shall deliver to Seller, by wire transfer to a bank account
designated in writing by Seller at least two business days prior to the
Closing Date, immediately available funds in an amount equal to the product of
the Consideration and the number of Seller's Shares, subject to adjustment as
hereinafter provided, and (ii) Seller shall deliver or cause to be delivered
to the Buyer one or more certificates representing Seller's Shares, duly
endorsed in blank or accompanied by stock powers duly endorsed in blank in
proper form for transfer, with appropriate transfer stamps, if any, affixed.

         3. Recalculation of Number of Shares and Consideration.
Notwithstanding anything to the contrary contained herein, at the Closing and
as of the Closing Date, the number of Shares to be sold in the aggregate by
the Seller and each additional stockholder who becomes a party hereto pursuant
to Section 24 and the Consideration shall be adjusted in accordance with Annex
A.

         4. Representations and Warranties of Seller. Seller hereby represents
and warrants to the Buyer as follows:

              (a) Organization and Standing. Seller is duly organized, validly
existing and in good standing under the laws of its state of organization; has
all requisite corporate power and authority necessary to carry on its business
as presently conducted and to enable it to own, lease or otherwise hold its
properties and assets; and is duly qualified to do business and is in good
standing in each jurisdiction in which the conduct or nature of its business
or the ownership, leasing or holding of its properties or assets makes such
qualification necessary, except such jurisdictions where the failure to be so
qualified or in good standing, individually or in the aggregate, would not
have a material adverse effect on the business, financial condition or results
of operations of Seller and its subsidiaries, taken as a whole (a "Seller
Material Adverse Effect").

              (b) Authority. Seller has all requisite corporate power and
authority to enter into this Agreement, to perform its obligations hereunder
and thereunder and to consummate the transactions contemplated hereby. All
corporate acts and other proceedings required to be taken by Seller to
authorize the execution, delivery and performance of this Agreement and the
consummation of the transactions contemplated hereby have been duly and
properly taken. This Agreement has been duly executed and delivered by Seller
and constitutes a legal, valid and binding obligation of Seller, enforceable
against Seller 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
equity principles as may apply in the enforcement of creditors' rights.

              (c) Ownership of Capital Stock of the Company; the Shares. (i)
Seller is the record and beneficial owner of the number of Shares set forth
opposite Seller's name on Exhibit A hereto. Seller has good and valid title to
Seller's Shares, in each case free and clear of any liens, charges, claims,
rights or encumbrances of any kind, except as may have been created by the
Buyer.

                   (ii) Assuming the Buyer is a "bona fide purchaser" within
the meaning of the Uniform Commercial Code of the State of New York, upon
delivery to the Buyer at the Closing of certificates representing such Shares,
duly endorsed by Seller for transfer to the Buyer, and upon the Seller's
receipt of the Consideration, good and valid title to such Shares will pass to
the Buyer, free and clear of any liens, charges, claims, rights or
encumbrances of any kind except as may have been created by the Buyer. 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) the 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.

              (d) No Conflicts; Consents. The execution and delivery of this
Agreement by Seller does not, and the consummation of the transactions
contemplated hereby and compliance by Seller with the terms hereof will not,
conflict with, or result in any violation of or default (with or without
notice or lapse of time, or both) under, or give rise to a right of
termination, cancellation or acceleration of any obligation or to loss of a
material benefit under, or result in the creation of any lien, charge or
encumbrance of any kind upon any of the Shares being sold by Seller under, any
provision of (i) the articles of incorporation or by-laws or equivalent
organizational document of Seller, (ii) except for the Existing Stockholders
Agreement, which shall have been terminated by the Effective Time, any
material note, bond, mortgage, indenture, deed of trust, loan document,
license, lease, contract, commitment, agreement or arrangement to which Seller
is a party or by which Seller or any of its properties or assets is bound or
(iii) any judgment, order or decree, or statute, law, ordinance, rule or
regulation, applicable to Seller or any of its properties or assets. No
consent, approval, license, permit, order or authorization of, or
registration, declaration or filing with, any Federal, state, local or foreign
government or any court of competent jurisdiction, administrative agency or
commission or other governmental authority or instrumentality, domestic or
foreign, or any national securities or commodities exchange or other
regulatory or self-regulatory body or association (a "Governmental Entity") is
required to be obtained or made by or with respect to such Seller in
connection with the execution, delivery and performance of this Agreement by
such Seller or the consummation of the transactions contemplated hereby, other
than compliance with and filings under the Hart-Scott-Rodino Antitrust
Improvements Act of 1976 (the "HSR Act"), if applicable.

         5. Representations and Warranties of the Buyer. The Buyer hereby
represents and warrants to the Seller as follows:

              (a) Organization and Standing. The Buyer is duly organized,
validly existing and in good standing under the laws of the State of Delaware;
has all requisite power and authority necessary to carry on its business as
presently conducted and to enable it to own, lease or otherwise hold its
properties and assets; and is duly qualified to do business and is in good
standing in each jurisdiction in which the conduct or nature of its business
or the ownership, leasing or holding of its properties or assets makes such
qualification necessary, except such jurisdictions where the failure to be so
qualified or in good standing, individually or in the aggregate, would not
have a material adverse effect on the business, financial condition or results
of operations of the Buyer and its Subsidiaries, taken as a whole (a "Buyer
Material Adverse Effect").

              (b) Authority. The Buyer has all requisite corporate power and
authority to enter into this Agreement, to perform its obligations hereunder
and to consummate the transactions contemplated hereby. All corporate acts and
other proceedings required to be taken by the Buyer to authorize the
execution, delivery and performance of this Agreement and the consummation of
the transactions contemplated hereby have been duly and properly taken. This
Agreement has been duly executed and delivered by the Buyer and constitutes a
legal, valid and binding obligation of the Buyer, enforceable against the
Buyer 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 equity
principles as may apply in the enforcement of creditors' rights.

              (c) No Conflicts; Consents. The execution and delivery of this
Agreement by the Buyer does not, and the consummation of the transactions
contemplated hereby and compliance by the Buyer with the terms hereof will
not, conflict with, or result in any violation of or default (with or without
notice or lapse of time, or both) under, or give rise to a right of
termination, cancellation or acceleration of any obligation or to loss of a
material benefit under, or result in the creation of any lien, charge or
encumbrance of any kind upon any of the properties or assets of the Buyer
under, any provision of (i) the certificate of incorporation or by-laws of the
Buyer, (ii) any material note, bond, mortgage, indenture, deed of trust, loan
document, license, lease, contract, commitment, agreement or arrangement to
which the Buyer is a party or by which it or any of its properties or assets
is bound or (iii) any judgment, order or decree, or statute, law, ordinance,
rule or regulation, applicable to the Buyer or any of its properties or
assets. 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 and performance of this Agreement by the Buyer or the
consummation of the transactions contemplated hereby, other than compliance
with and filings under the HSR Act.

         6. Covenants of the Seller.

              (a) Seller agrees that (other than pursuant to the Merger
Agreement) it shall not, and shall not agree to, (i) sell, assign, dispose of,
encumber, mortgage, hypothecate or otherwise transfer (collectively,
"Transfer") any of its Shares to any person or entity.

              (b) Each holder of Voting Common Stock (as defined herein) who
becomes a party hereto pursuant to Section 24 hereof hereby irrevocably and
unconditionally agrees (a) to vote or to cause to be voted all shares of
Voting Common Stock owned by such Seller at any annual or special meeting of
shareholders of the Company where such matters arise in favor of, and, if
applicable, deliver a consent in lieu of a meeting to, the approval and
adoption of the Merger Agreement and the transactions contemplated by the
Merger Agreement, and (b) to vote or to cause to be voted all shares of Voting
Common Stock owned by such Seller at any annual or special meeting of
shareholders of the Company where such matters arise, against, and if
applicable, withhold its consent in lieu of a meeting to (i) any proposal made
in opposition to or in competition with the Merger or any of the other
transactions contemplated by the Merger Agreement, (ii) any merger,
consolidation, sale of assets, business combination, share exchange,
reorganization or recapitalization of the Company or any of its subsidiaries,
with or involving any party other than Buyer (iii) any liquidation or winding
up of the Company (iv) any extraordinary dividend by the Company, (v) any
change in the capital structure of the Company (other than as contemplated by
the Recapitalization pursuant to the Merger Agreement) and (vi) any other
action that may reasonably be expected to impede, interfere with, delay,
postpone or attempt to discourage the Merger or the other transactions
contemplated by the Merger Agreement or result in a breach of any of the
covenants, representations, warranties or other obligations or agreements of
the Company under the Merger Agreement which would cause the Company not to
satisfy the condition set forth in Section 9(c)(i) of the Merger Agreement.

              (c) Publicity. From the date of the execution and delivery of
this Agreement through the Closing, no public release or announcement
concerning the transactions contemplated hereby shall be issued by Seller
without the prior consent of the Buyer (which consent shall not be
unreasonably withheld), except as such release or announcement may be required
by law or the rules or regulations of any United States or foreign securities
exchange, in which case the party required to make the release or announcement
shall, if practicable, allow the Buyer, as the case may be, reasonable time to
comment on such release or announcement in advance of such issuance.

         7. Mutual Covenants.

              (a) Consummation of the Transactions. Subject to the terms and
conditions of this Agreement, each party shall use its commercially reasonable
efforts to cause the Closing to occur upon the terms and conditions hereof.
The Seller shall cooperate with the Buyer, and the Buyer shall cooperate with
the Seller and the Company in filing any necessary applications, reports or
other documents with, giving any notices to, and seeking any consents from,
all Governmental Entities and all third parties as may be required in
connection with the consummation of the transactions contemplated by this
Agreement.

         8. Conditions to Closing.

              (a) Each Party's Obligation. The respective obligation of each
party hereto to effect the transactions contemplated hereby is subject to the
satisfaction or waiver as of the Closing of the following conditions: (i) no
statute, rule, regulation, executive order, decree, temporary restraining
order, preliminary or permanent injunction or other order shall have been
enacted, entered, promulgated, enforced or issued by any Governmental Entity
that prohibits the purchase and sale of the Shares or any of the other
material transactions contemplated by this Agreement and (ii) no action,
claim, proceeding or investigation shall be pending or threatened by any
Governmental Entity (other than a court acting in response to an action, claim
or proceeding brought by a non-Governmental Entity) that, if successful, would
result in any of the foregoing effects.

              (b) The Seller's Obligation. The obligation of the Seller to
sell and deliver the Shares to the Buyer is subject to the satisfaction (or
waiver by the Seller) as of the Closing of the following conditions:

                   (i) The representations and warranties of the Buyer made in
this Agreement shall be true and correct as of the date hereof and as of the
time of the Closing as though made as of such time except to the extent such
representations and warranties expressly relate to an earlier date (in which
case such representations and warranties shall be true and correct on and as
of such earlier date), and the Buyer shall have duly performed, complied with
and satisfied in all material respects all covenants, agreements and
conditions required by this Agreement to be performed, complied with or
satisfied by the Buyer by the time of Closing except where the failure of such
representations and warranties to be true and correct and/or the failure to
perform, comply with and satisfy such covenants, agreements and conditions
would not constitute a Company Transaction Value Impairment. The Buyer shall
have delivered to the Seller a certificate dated the Closing Date and signed
by an officer of the Buyer confirming the foregoing.

                   (ii) The transactions contemplated by the Merger Agreement
shall have been consummated immediately prior to the Closing hereunder.

              (c) The Buyer's Obligation. The obligation of the Buyer to
purchase the Shares from the Seller is subject to the satisfaction (or waiver
by the Buyer) as of the Closing of the following conditions:

                   (i) The representations and warranties of the Seller made
in this Agreement shall be true and correct as of the date hereof and as of
the time of the Closing as though made as of such time, except to the extent
such representations and warranties expressly relate to an earlier date (in
which case such representations and warranties shall be true and correct on
and as of such earlier date), and the Seller shall have duly performed,
complied with and satisfied in all material respects all covenants, agreements
and conditions required by this Agreement to be performed, complied with or
satisfied by the Seller by the time of Closing except where the failure of
such representations and warranties to be true and correct and/or the failure
to perform, comply with and satisfy such covenants, agreements and conditions
would not constitute a VANTAS Transaction Value Impairment (other than those
contained in Sections 4(b) and 4(c), which shall be true and correct). Seller
shall have delivered to the Buyer a certificate dated the Closing Date and
signed by Seller confirming the foregoing.

                   (ii) The transactions contemplated by the Merger Agreement
shall have been consummated immediately prior to the Closing hereunder.

              (d) Frustration of Closing Conditions. Neither Seller nor the
Buyer may rely on the failure of any condition set forth in Section 8(a),
Section 8(b) or Section 8(c), respectively, to be satisfied if such failure
was caused by such party's failure to perform its obligations hereunder or to
use its commercially reasonable efforts to cause the Closing to occur as
required by Section 7(a).

         9. Further Assurances. From time to time, as and when requested by
another party hereto, a party hereto shall execute and deliver, or cause to be
executed and delivered, all such documents and instruments and shall take, or
cause to be taken, all such further or other actions as such other party may
reasonably deem necessary or desirable to consummate the transactions
contemplated by this Agreement.

         10. Assignment. This Agreement and the rights and obligations
hereunder shall not be assignable or transferable by (i) Seller without the
prior written consent of the Buyer or (ii) by the Buyer without the prior
written consent of Seller; provided, however, that the Buyer may assign its
right to purchase the Shares hereunder without the prior written consent of
the Seller including without limitation an assignment to the HQ Surviving
Corporation; provided, that such assignment shall not limit or affect Buyer's
obligations hereunder; and provided, further, that any party hereto may assign
its rights and obligations hereunder in connection with a merger,
consolidation or other similar business combination involving such party or a
sale of all or substantially all of such party's assets. Any attempted
assignment in violation of this Section 10 shall be void ab initio and of no
further force and effect.

         11. No Third-Party Beneficiaries. This Agreement is for the sole
benefit of the parties hereto and their successors and permitted assigns, and
nothing herein expressed or implied shall give or be construed to give to any
person, other than the parties hereto and such permitted successors and
assigns, any legal or equitable rights hereunder.

         12. Termination. (a) Anything contained herein to the contrary
notwithstanding, this Agreement shall automatically terminate upon termination
of either the Merger Agreement or the UK Agreement. In addition, anything
contained herein to the contrary notwithstanding, this Agreement may be
terminated and the transactions contemplated hereby abandoned at any time
prior to the Closing:

                   (i) by mutual written consent of the Seller and the Buyer;

                   (ii) by the Seller if the Company has the right to
terminate the Merger Agreement in accordance with its terms;

                   (iii) by RSI if VANTAS has the right to terminate the
Merger Agreement in accordance with its terms;

                   (iv) 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 May 1, 2000), if the Closing
does not occur on or prior to April 30, 2000;

                   (v) by the Seller or Buyer at any time prior to the
Closing, if any Governmental Entity shall have issued a judgment, order or
decree or taken any other action permanently enjoining, restraining or
otherwise prohibiting the purchase of the Shares or any of the other material
transactions contemplated by this Agreement, and such judgment, order or
decree or other action shall have become final and nonappealable;

                   (vi) by the Buyer, to the extent that the representations
made by the Seller and one or more Additional Stockholder Parties hereto, if
any, contained in Sections 4(b) and 4(c) relating (i) to any Shares of Voting
Common Stock or (ii) to any Shares of Non-Voting Common Stock representing in
the aggregate 5% or more of the outstanding shares of Non-Voting Common Stock,
are not true and correct or become untrue and correct and are incapable of
being rendered true and correct.

              (b) In the event of termination of this Agreement by Seller or
the Buyer pursuant to this Section 12, written notice thereof setting forth
the reasons therefor shall forthwith be given to the other parties (including
any Additional Stockholder Parties hereto) and the transactions contemplated
by this Agreement shall be terminated, without further action by any party.

              (c) If this Agreement is terminated and the transactions
contemplated hereby are abandoned as described in this Section 12, this
Agreement shall become void ab initio and of no further force or effect,
except for the provisions of (i) Section 6(c) relating to publicity, (ii) this
Section 12 and (iii) Section 13 relating to certain expenses. Nothing in this
Section 12 shall be deemed to release any party from any liability for any
breach by such party of the terms and provisions of this Agreement, the UK
Agreement or the Merger Agreement.

         13. Expenses. Whether or not the transactions contemplated hereby are
consummated, and except as otherwise specifically provided in this Agreement,
all costs and expenses incurred in connection with this Agreement and the
transactions contemplated hereby shall be paid by the party incurring such
costs or expenses.

         14. Amendments. No amendment, modification or waiver in respect of
this Agreement shall be effective unless it shall be in writing and signed by
the party against whom such amendment, modification or waiver is asserted.

         15. Notices. All notices or other communications required or
permitted to be given hereunder shall be in writing and shall be delivered by
hand or sent by prepaid telex, cable or telecopy or sent, postage prepaid, by
registered, certified or express mail or reputable overnight courier service
and shall be deemed given when so delivered by hand, telexed, cabled or
telecopied, or if mailed, three days after mailing (one business day in the
case of express mail or overnight courier service), as follows:

                   (i)   if to the Seller,

                         CarrAmerica Realty Corporation
                         1850 K Street, NW
                         Washington, D.C.  20006

                         Telecopy No: 202-729-1160
                         Attention: Linda Madrid, General Counsel

                         with a copy to:

                         Hogan & Hartson, L.L.P.
                         Columbia Square
                         555 Thirteenth Street, N.W.
                         Washington, D.C.  20004-1109

                         Telecopy No:     (202) 637-5910
                         Attention:  J. Warren Gorrell, Jr.
                                     David W. Bonser; and

                  (ii)   if to the Buyer,

                         Reckson Service Industries, Inc.
                         10 East 50th Street
                         Suite 2700
                         New York, NY  10022
                         Telecopy No:  (212) 931-8001
                         Attention:  Scott H. Rechler
                                     Jason M. Barnett

                         with copies to:

                         Brown & Wood LLP
                         One World Trade Center
                         New York, NY  10048
                         Telecopy No:  (212) 839-5599
                         Attention:   Joseph W. Armbrust, Jr.
                                      J. Gerard Cummins

or such other address as any party may from time to time specify by written
notice to the other parties hereto.

         16. Interpretation; Exhibits and Schedules. The headings contained in
this Agreement and in any Exhibit to this Agreement are for reference purposes
only and shall not affect in any way the meaning or interpretation of this
Agreement. All Exhibits and Annexes annexed hereto or referred to herein are
hereby incorporated in and made a part of this Agreement as if set forth in
full herein. Any capitalized term used in any Exhibit or Annex but not
otherwise defined therein shall have the meaning ascribed to it in this
Agreement. This Agreement is gender neutral. Any word in this Agreement that
refers to a particular gender shall also refer to all other genders, including
masculine, feminine and neuter.

         17. Counterparts. This Agreement may be executed in one or more
counterparts, all of which shall be considered one and the same agreement, and
shall become effective when one or more such counterparts have been signed by
each of the parties and delivered to the other parties.

         18. Litigation Costs. If any litigation with respect to the
obligations of the parties under this Agreement results in a final
nonappealable order of a court of competent jurisdiction that results in a
final disposition of such litigation, the prevailing party, as determined by
the court ordering such disposition, shall be entitled to reasonable
attorneys' fees as shall be determined by such court. Contingent or other
percentage compensation arrangements shall not be considered reasonable
attorneys' fees.

         19. Entire Agreement. This Agreement contains the entire agreement
and understanding between the parties hereto with respect to the subject
matter hereof and supersedes all prior agreements and understandings relating
to such subject matter. The parties hereto shall not be liable or bound to any
other party in any manner by any representations, warranties or covenants
relating to such subject matter except as specifically set forth herein.

         20. Brokers. Each party hereto hereby represents and warrants that no
brokers or finders have acted for such party in connection with this Agreement
except for Goldman, Sachs & Co. on behalf of CarrAmerica and Warburg Dillon
Read on behalf of the Buyer.

         21. Severability. If any provision of this Agreement (or any portion
thereof) or the application of any such provision (or any portion thereof) to
any person or circumstance shall be held invalid, illegal or unenforceable in
any respect by a court of competent jurisdiction, such invalidity, illegality
or unenforceability shall not affect any other provision hereof (or the
remaining portion thereof) or the application of such provision to any other
persons or circumstances.

         22. Consent to Jurisdiction. The Buyer and the Seller agree to
commence any action, suit or proceeding arising out of this Agreement or
transactions contemplated hereby against the other party either in a federal
court located in the State of Delaware or if such suit, action or other
proceeding may not be brought in such court for jurisdictional reasons, in a
Delaware state court. Each party to this Agreement submits and consents to
personal jurisdiction in any such litigation. The Buyer and the Seller further
agree that service of any process, summons, notice or document delivered by
U.S. registered mail to such party's respective address set forth above shall
be effective service of process for any action, suit or proceeding in Delaware
with respect to any matters to which it has submitted to jurisdiction in this
Section 22. The Buyer and the Seller irrevocably and unconditionally waive any
objection to the laying of venue of any action, suit or proceeding arising out
of this Agreement or the transactions contemplated hereby in (i) any Delaware
state court or (ii) any federal court located in the State of Delaware, and
hereby further 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. EACH OF THE PARTIES
HERETO IRREVOCABLY WAIVES TRIAL BY JURY IN ANY ACTION OR PROCEEDING WITH
RESPECT TO THIS AGREEMENT.

         23. Governing Law. This Agreement shall be governed by and construed
in accordance with the internal laws of the State of Delaware applicable to
agreements made and to be performed entirely within such State, without regard
to the conflicts of law principles of such State.

         24. Additional Signature Parties. At any time after the date hereof
and prior to five (5) business days prior to the Closing, any other holder of
Non-Voting Common Stock or any holder of voting common stock, par value $.01
per share (the "Voting Common Stock "), of the Company 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
stockholder 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, as applicable, held by such Additional Stockholder Party and set forth
on such Additional Party Signature Page on the same terms as set forth in this
Agreement, and shall be deemed to have made the representations and warranties
of Seller herein and be bound by the other agreements of Seller herein. To the
extent that any Additional Stockholder Party elects to sell shares of
Non-Voting Common Stock or Voting Common Stock, as applicable, 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 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, in the
aggregate including CarrAmerica and all Additional Stockholder Parties, shown
as being proposed to be sold by CarrAmerica on Exhibit A as delivered on the
date hereof; 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.

<PAGE>

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

                                         CARRAMERICA REALTY CORPORATION

                                         By:  /s/ Karen Dorigan
                                              _________________________________
                                              Name:
                                              Title:

                                         RECKSON SERVICE INDUSTRIES, INC.

                                         By: /s/ Jason Barnett
                                             ____________________________
                                               Name:
                                               Title:

<PAGE>

                                   Exhibit A

                             Number of Shares Sold
                             ---------------------

CarrAmerica Realty Corporation              4,226,116 shares of non-voting
                                            common stock

<PAGE>

                                    Annex A

The total Consideration payable to the Seller and any additional stockholder
who becomes a party hereto pursuant to Section 24 shall be increased by the
product of (x) ___% and (y) the sum of (i) all severance payments paid or
payable by VANTAS to employees pursuant to written employment agreements in
effect on the date hereof, and (ii) the total amount of cash paid pursuant to
Section 1(i)(i) of the Merger Agreement, and shall be decreased by the product
of (w)___% and (z) the sum of (i) all severance payments paid or payable by
the Company to employees pursuant to written employment agreements in effect
on the date hereof and (ii) the total amount of cash paid or payable to the
holders of Company stock options and/or warrants who have become entitled to
such payments as a result of the execution of the Merger Agreement or the
consummation of the Merger to such payments (the net effect of such increase
and decrease is referred to herein as the "Net Adjustment"). In the event
additional stockholders of the Company become parties to this Agreement
pursuant to Section 24, the Net Adjustment shall be allocated among the Seller
and all such additional stockholders pro rata in the same proportion that the
total Consideration to be paid to Seller and each such stockholder bears to
the aggregate amount payable under this Agreement before giving effect to this
Annex A.

<PAGE>

                                    Annex B

         The undersigned, desiring to sell _____ shares of its [Voting Common
Stock/Non-Voting Common Stock] to Reckson Service Industries, Inc., a Delaware
corporation ("RSI"), pursuant to the terms and conditions of that certain
Stock Purchase Agreement (the "Stock Purchase Agreement"; capitalized terms
not defined herein having the meanings ascribed therein), dated as of January
__, 2000, by and between RSI and CarrAmerica, hereby agrees, pursuant to
Section 24 of the Stock Purchase Agreement, to (i) become a party to the Stock
Purchase Agreement, and to be bound to all of the terms and conditions thereof
as a Seller, including without limitation the representations, warranties and
agreements therein and (ii) pay its pro rata share of expenses incurred by the
Company [and CarrAmerica on behalf of the Company] in connection with the
consummation of the transactions contemplated by the Stock Purchase Agreement.
Notwithstanding anything to the contrary contained in the Stock Purchase
Agreement, in the event the undersigned shall breach any representation or
warranty or otherwise fail to perform one of its obligations under the Stock
Purchase Agreement, CarrAmerica shall have the right to make such
representation or warranty and otherwise perform such obligations on behalf of
the undersigned. The undersigned agrees that this signature page may be
attached to any counterpart of said Stock Purchase Agreement.

                                 ------------------------------------

                                 By: _________________________________
                                      Name:
                                      Title:

As of _____________, 2000

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