##### 



FOURTH AMENDED AND RESTATED  AGREEMENT OF LIMITED PARTNERSHIP  OF  BIOMED REALTY, L.P.
 Partnership Company Exhibit A
 Original Partnership Agreement
 First Amended and Restated Partnership Agreement Current Partners
 Second Amended and Restated Partnership Agreement
 Third Amended and Restated Partnership Agreement




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ARTICLE 1.
 Definitions
  Act
 Additional Funds Section 4.3.A
 Additional Limited Partner Section 12.2
 Adjusted Capital Account Deficit
 (i)
    
    such deficit shall be decreased by any amounts which such
Partner is obligated to restore pursuant to this Agreement or is deemed to be
obligated to restore pursuant to Regulations Section 1.704-1(b)(2)(ii)(c) or
the penultimate sentence of each of Regulations Sections 1.704-2(i)(5) and
1.704-2(g)(1); and(ii)
    
    such deficit shall be increased by the items described in
Regulations Section 1.704-1(b)(2)(ii)(d)(4), (5) and (6).
 Adjusted Capital Account Balance
 Adjustment Date provided that
 Affiliate
 2




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Agreed Value Exhibit
A Exhibit A Exhibit A
 Agreement
 Appraisal
 Assignee Section 11.5
 Available Cash
      3




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Book-up Event
 Book-up Value
 Business Day
 Capital Account
 Section 6.3
 4




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Section 6.3
   provided that Article 13
 Capital Contribution
 Cash Amount
 5




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Certificate
 Change of Control
 Charter
 Code
 Consent Article 14
 Consent of the Limited Partners
 Consent of the Partners
 6




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Constructively Own Exhibit C
 Contributed Property
 Debt
 Deemed Partnership Interest Value
 Deemed Value of the Partnership Interests Sections 4.1 4.3.B Section 7.5 divided by provided that
 Depreciation provided however
 7




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Economic Capital Account Balance
 Effective Date Exhibit A
 ERISA
 Exchange Act
 Fair Market Value provided that provided further that
 8




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Section
4.3.D provided
 Forfeitable LTIP Units
 General Partner
 General Partner Interest
 Gross Asset Value
 Exhibit A provided that Exhibit A
 provided however
 (i)
    
    the acquisition of an additional interest in the Partnership by
a new or existing Partner in exchange for more than a de minimis Capital
Contribution, if the General Partner reasonably determines that such adjustment
is necessary or appropriate to reflect the relative economic interests of the
Partners in the Partnership;(ii)
    
    the distribution by the Partnership to a Partner of more than a
de minimis amount of Partnership property as consideration for an interest in
the Partnership if the General Partner reasonably determines that such
adjustment is necessary or appropriate to reflect the relative economic
interests of the Partners in the Partnership;
 9




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(iii)
    
    the liquidation of the Partnership within the meaning of
Regulations Section 1.704-1(b)(2)(ii)(g);(iv)
    
    at such other times as the General Partner shall reasonably
determine necessary or advisable in order to comply with Regulations Sections
1.704-1(b) and 1.704-2; and(v)
    
    in connection with the grant of an interest in the Partnership
(other than a de minimis interest) as consideration for the provision of
services to or for the benefit of the Partnership by an existing Partner acting
in a partner capacity or by a new Partner acting in a partner capacity or in
anticipation of becoming a Partner (including the grant of any LTIP Units).
  provided however
   Holder
 Immediate Family
 Incapacity Incapacitated
 10




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Indemnitee
 IRS
 Junior Units
 Limited Partner Exhibit A
 Limited Partner Interest
 11




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Liquidating Event Section 13.1
 Liquidator Section 13.2.A
 LTIP Equalization Date
 LTIP Forfeiture Agreement
 LTIP Unit
 LTIP Unitholder
 Majority in Interest of the Limited Partners
 Net Income Net Loss
    12




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Section 6.3 Section 6.3
 New Securities
 Non-Forfeitable LTIP Units
 Nonrecourse Deductions
 Nonrecourse Liability
 Notice of Redemption Exhibit B
 Parity Preferred Unit
 13




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Partner Partners
 Partner Minimum Gain
 Partner Nonrecourse Debt
 Partner Nonrecourse Deductions
 Partnership
 Partnership Unit Economic Balance
 Partnership Interest Section 4.3
 Partnership Minimum Gain
 Partnership Record Date Section 5.1
 Partnership Unit Unit Sections 4.1 and 4.3 Exhibit D Section 4.1 and
4.3
 14




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Partnership Year
 Percentage Interest Exhibit A Section 4.3.D
 Person
 Plan Asset Regulation
 Pledge Section 11.3.A
 Post-Grant Gains
 Properties
 Qualifying Party
 Qualified REIT Subsidiary
 Qualified Transferee
 Redemption Section 8.6.A
 Regulations
 15




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Regulatory Allocations Section
6.3.A(viii)
 REIT
 REIT Requirements Section 5.1
 REIT Series A Preferred Share
 REIT Share
 REIT Shares Amount Section 7.5 pro rata
 Safe Harbor Election
 Securities Act
 Series A Articles Supplementary
 Series A Preferred Capital
 Series A Preferred Unit Distribution Payment Date
 Series A Priority Return
 16




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Specified Redemption Date
 Stock Plan
 Subsidiary
 Subsidiary Partnership
 Substituted Limited Partner Section 11.4
 Surviving Partnership Section 11.2.B(2)
 Tax Distributions
 Tax Items Section 6.4.A
 Tenant
 Tendered Units Section 8.6.A
 Tendering Partner Section 8.6.A
 Termination Transaction
 Rules of Construction
 REIT REIT
Requirements REIT Shares REIT Shares Amount
 17




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ARTICLE 2.
 Organization
  Name
  Registered Office and Agent; Principal Office
  Power of Attorney
   18




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Articles 11 12 13
  Article 14
  19




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Term
 Article 13
 ARTICLE 3.
 Purpose and Business
 provided however
 Powers
 provided however
 Partnership Only for Purposes Specified
 Section 3.1
 20




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Section 3.1
 Representations and Warranties by the Parties
    21




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Exhibit E
 Exhibit F Section
8.6
  E(1) (2)
 22




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flow through entity
 Sections 3.4
  Certain ERISA Matters
  ARTICLE 4.
 Capital Contributions of the Partners
 Exhibit A Exhibit A Exhibit A Exhibit A Sections 4.3 4.4 10.5
 23




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Loans by Third Parties
 Section 4.3 provided that
 Additional Funding and Capital Contributions
 General Additional Funds Section 4.3 Section 4.3
 Issuance of Additional Partnership Interests Section 11.2.A provided that Section 4.3.C Section 4.3.B
 24




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Section 4.3.B Section 5.4 Section
6.2.C Section 8.6
 Issuance of REIT Shares or Other Securities by the General Partner Section
8.6
 provided that provided further
 25




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Section 7.4 Section 7.4
 Percentage Interest Adjustments in the Case of Capital Contributions for
Partnership Units Adjustment Date pro rata plus Section
4.3.D
 Other Contribution Provisions
 26




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No Preemptive Rights
  LTIP Units.
     27




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28




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.
   29




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30




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31




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No Interest; No Return
  32




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LTIP Units Characterized as Partnership Units
   ARTICLE 5.
 Requirement and Characterization of Distributions
 Article 4 Section 16.2
 33




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Distributions in Kind
 Articles 5 6 10
 Distributions Upon Liquidation
 Section 5.1 Section 13.2
 Distributions to Reflect Issuance of Additional Partnership Interests
 Section 4.3.B 4.3.C Article 5 Section 5.1 Section 5.4
 ARTICLE 6.
 Timing and Amount of Allocations of Net Income and Net Loss
 Article 6
 General Allocations
 Allocation of Net Income and Net Losses
 Net Income
 34




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First Section
6.2.A.2(c) minus Section 6.2.A.(1)(a)
 Second Section
6.2.A.2(b) minus Section 6.2.A.(1)(b)
 Third Section 6.2.A.2(a) minus Section
6.2.A.(1)(c)
 Fourth Section 6.2.A.1(d)
 Fifth
 Section 6.2.A.(1)
 Net Losses Section 6.3
 First Section
6.2.A(2)(a)
 Second
 35




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Third,
 Allocations to Reflect Issuance of Additional Partnership Interests Section 4.3 Section 6.2
 Additional Allocation Provisions
 Article 6
 Ordering Rule for Allocations Regarding LTIP Units
    36




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37




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Minimum Gain Chargeback Section 6.2 Article 6 Section
6.3.C(i) Section 6.3.C(i)
 Partner Minimum Gain Chargeback Section 6.2 Article 6 Section 6.3.C(i) Section 6.3.C(ii) Section 6.3.C(ii)
 Nonrecourse Deductions and Partner Nonrecourse Deductions
 Qualified Income Offset Section 6.3.C(iv) Article 6
 38




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Section 6.3.C(iv) Section
6.3.C(iv) Section 6.3.C(iv)
 Gross Income Allocation provided that Section 6.3.C(v) Article 6 Section 6.3.C(v) Section 6.3.C(iv)
 Limitation on Allocation of Net Loss Section 6.3.C(vi)
 Section 754 Adjustment
 Curative Allocation Sections 6.3.C(i) (ii) (iii) (iv) (v) (vi) (vii) Regulatory Allocations Sections 6.1 6.2
  39




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Tax Allocations
 In General Section 6.4 Tax
Items Sections 6.2 6.3
 Allocations Respecting Section 704(c) Revaluations
 ARTICLE 7.
 Management
  40




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Sections 7.3 11.2 Section 3.2 Section 3.1
   Section 11.2
   41




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provided that
   42




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provided that
        Section 4.3
 Section
8.6
 Exhibit A
 43




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Exhibit A
   Section 7.3 11.2
     44




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Certificate of Limited Partnership
 Section
8.5.A(4)
 Restrictions on General Partners Authority
  Section 7.3.C
 Section 7.3.B
  Sections 4.3.B, 5.4 6.2B.
 45




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Exhibit A Exhibit A
 Article 4
    Capital Account
  Section 7.3.C
 Sections 7.3.B 7.3.C Article 5 Section 13.2.A(4) Article 6 Sections
4.3 5.4 6.2.B Section 7.3.C(3) Section
8.6 Section 7.3.D Section 7.3 Section 11.2.B Section 7.3.D
 46




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Reimbursement of the General Partner
 Section 7.4 Articles 5 6
 provided that Section 7.7
 provided that Section 8.6
 47




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Section 7.5 pro rata
 Section 4.3
 Section 7.4
 Outside Activities of the General Partner
 Section 11.2
 48




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Section 4.3.D REIT Shares Amount Section 7.5.A
  Contracts with Affiliates
  Section 7.5.A
  49




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Indemnification
 Section 7.7 Section 7.7.A Section 7.7
 50




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Section 7.7
 Section 7.7
 Section 7.7
  Section 7.7 Section 7.7
  Section 7.7
 Section 7.7 Section 7.7
 51




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Section 7.7
 Section 7.7
  Section 7.7.K
 Liability of the General Partner
  provided however
 52




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provided that
 Section
7.1.A
 Section 7.8 Section 7.8
 Other Matters Concerning the General Partner
     53




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Title to Partnership Assets
 provided however
 Reliance by Third Parties
  54




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ARTICLE 8.
 Limitation of Liability
  Management of Business
  Outside Activities of Limited Partners
  Return of Capital
 Section 8.6
 55




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Rights of Limited Partners Relating to the Partnership
 Section 8.5.C
       Section 8.5
 Redemption Rights
  56




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Tendered Units Redemption Tendering Partner
 Section 8.6.A
 Section 8.6.E
 57
         Section 8.6.A 8.6.B 8.6.C
 58




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Section 8.6.E ab initio
 Section
8.6.E Section 8.6
      Section 4.3.B Section 8.6
  59




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ARTICLE 9.
 Records and Accounting
 Section 9.3 provided that
      60




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Nondisclosure of Certain Information
 Sections 9.1 9.3
 ARTICLE 10.
 Preparation of Tax Returns
  Tax Elections
  Tax Matters Partner
 tax matters partner provided however
   61




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tax audit judicial review notice partner notice group
 final adjustment
     Section 7.7
  62




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Organizational Expenses
  Withholding
 Section 10.5 Wall Street Journal i.e.
 ARTICLE 11.
 Transfer
 transfer Article 11 Article 11 Section 8.6
 63




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Article 11 Article
11 ab initio
 Transfer of General Partners Partnership Interest
 Section
11.2.B Section 12.1 Section 11.2
 Termination Transaction
 provided that
 64




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Section 8.6
 Surviving Partnership Section 11.2.B(2)(a)
 Limited Partners Rights to Transfer
 provided however Section 11.6 Section 11.6 Section
11.6 Pledge
 65




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Section 11.6
 General Partner Right of First Refusal Section 11.3
 Qualified Transferee
 Section 3.4.D Section 11.5
  Section
11.3
 66




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Substituted Limited Partners
 Section 11.3 Section 11.4
 Article 11 Section 2.4 Section 3.4
 Exhibit A
 Assignees
 Section 11.3 Section 11.4 Article 11 Section 8.6
 67




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Article 11 Section 3.4
 General Provisions
 Article 11 Section
8.6
 Article 11 Section 8.6
 Article 11
 Article 11 Section 8.6
 68




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Article 11 Section 2.6 Section 11.2 Section 3.4.E(5) Section 3.4.C
 69




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Safe Harbors
 ARTICLE 12.
 Admission of Successor General Partner
 Section
11.2 Article 11
 Admission of Additional Limited Partners
 Section 2.4
 70




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Section 12.2
 Amendment of Agreement and Certificate of Limited Partnership
 Exhibit
A Section 2.4
 ARTICLE 13.
 Dissolution
 Section 13.1.B Liquidating Event
 Section 2.5
  71




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Section 11.2
      Winding Up
 Liquidator
  72




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Section 13.2.A(4)
 Article 13 Section 7.4
 Section 13.2.A Section 13.2.A
 Capital Contribution Obligation
  73




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Compliance with Timing Requirements of Regulations
 Article 13
  provided that Section 13.2.A
 Deemed Distribution and Recontribution
 Article 13
 Rights of Limited Partners
  Notice of Dissolution
 Section 13.1
 74




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Cancellation of Certificate of Limited Partnership
 Section 13.2
 Reasonable Time for Winding-Up
 Section 13.2
 Waiver of Partition
  ARTICLE 14.
 Amendments
 Section 7.3 Article 14
 provided that
 75




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Action by the Partners
 Section 14.1
     Voting Rights of LTIP Units
 76




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ARTICLE 15.
 Addresses and Notice
 Exhibit A
 Titles and Captions
  Pronouns and Plurals
  77




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Further Action
  Binding Effect
  Creditors
  Waiver
  Counterparts
  Applicable Law
  Invalidity of Provisions
  Entire Agreement
  78




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No Rights as Stockholders
  Article 8 Opt-In
  ARTICLE 16.
 Designation and Number
 Series A Preferred Units
 Distributions
 Payment of Distributions Series A Preferred Unit Distribution Payment
Date
 79




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Distributions Cumulative Section 16.2.C
 Priority as to Distributions
 Section 16.2.C.(ii) provided
  No Further Rights
 80




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Liquidation Proceeds
 Distributions Article 13
 Notice Section 13.7
 No Further Rights
 Consolidation, Merger or Certain Other Transactions
 Redemption
 Redemption Section 5 Article SECOND
 Procedures for Redemption
  81




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Ranking
  Voting Rights
  Transfer Restrictions
 Section
11.2
 82




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No Conversion Rights
  No Sinking Fund
  83




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General Partner:
    
    BIOMED REALTY TRUST, INC.,
a Maryland corporationBy:
    
    /s/ GARY A. KREITZERName: Gary A. KreitzerTitle: Executive Vice President