Document:

Exhibit 10.5

 Exhibit 10.5 
 FIRST AMENDMENT TO CREDIT AGREEMENT AND OTHER LOAN DOCUMENTS 
 THIS FIRST AMENDMENT TO
CREDIT AGREEMENT AND OTHER LOAN DOCUMENTS (this “Amendment”) made as of the 10th day of February, 2009, by and among GRIZZLY VENTURES LLC, a Delaware limited liability company (“Borrower”), DUPONT FABROS
TECHNOLOGY, L.P., a Maryland limited partnership (“Guarantor”), TARANTULA VENTURES LLC, a Delaware limited liability company (“Additional Guarantor”), KEYBANK NATIONAL ASSOCIATION, a national
banking association (“KeyBank”), THE OTHER LENDERS WHICH ARE SIGNATORIES HERETO (KeyBank and the other lenders which are signatories hereto, collectively, the “Lenders”), and KEYBANK NATIONAL
ASSOCIATION, a national banking association, as Administrative Agent for the Lenders (the “Agent”). 
 W I T N E S S E
T H: 
 WHEREAS, Borrower, Guarantor, Agent, and the Lenders entered into that certain Credit Agreement dated as of
October 24, 2008 (as amended herein and as the same may be further varied, extended, supplemented, consolidated, replaced, increased, renewed, modified or amended from time to time, the “Credit Agreement”); 
 WHEREAS, pursuant to the Credit Agreement, Lenders made a loan to Borrower in the original principal amount of $100,000,000.00, increasable up to
$250,000,000.00 in accordance with the terms of the Credit Agreement (the “Loan”), which Loan is evidenced by, among other things, the Notes made by Borrower to the order of Lenders and delivered from time to time under the Credit
Agreement (together with all amendments, modifications, consolidations, increases, supplements and extensions thereof, collectively, the “Note”); 
 WHEREAS, Borrower desires to increase the “Total Commitment” under the Credit Agreement; 
 WHEREAS, in order to induce additional lenders to join in funding the increase of the Total Commitment, the Agent, the Lenders, the Borrower, Guarantor and Additional Guarantor desire to enter into this Amendment to reflect the
increase of the Total Commitment under the Credit Agreement and the delivery by Additional Guarantor of, among other documents, a Guaranty and a mortgage on the additional collateral to further secure the Loan. 
 NOW, THEREFORE, for and in consideration of the sum of TEN and NO/100 DOLLARS ($10.00), and other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the parties hereto do hereby covenant and agree as follows: 
 1. Definitions. All the
terms used herein which are not otherwise defined herein shall have the meanings set forth in the Credit Agreement, as amended herein. 
 2.
Modification of the Credit Agreement. Borrower, Guarantor, the Lenders and Agent do hereby modify and amend the Credit Agreement as follows: 
 (a) By inserting the following definitions in Section 1.1 of the Credit Agreement: 
 “Additional Guarantor.
Tarantula Ventures LLC, a Delaware limited liability company. 

 Additional Mortgaged Property. That certain Data Center Facility, CH1 owned by Additional
Guarantor located at 2200 S. Busse Road, Elk Grove Village, Illinois. 
 Additional Property Building. The data center located on the
Additional Mortgaged Property known as CH1 to consist when fully completed of approximately 485,000 gross square feet and 211,140 raised square feet with a critical load of 36.4 megawatts (the first phase will consist of approximately 121,223 raised
square feet with a critical load of 18.2 megawatts), and all of the buildings, structures and improvements now or hereafter located thereon. 
 Additional Property Leases. The collective reference to all leases, subleases, licenses and occupancy agreements (whether written or oral) affecting the Additional Mortgaged Property or any part thereof now existing or hereafter
executed and all amendments, modifications or supplements thereto. 
 CH1 Assignment of Leases and Rents. The Assignment of Leases
and Rents from Additional Guarantor to KeyBank, as agent under a construction loan facility, dated as of December 20, 2007, recorded in the Official Records of Cook County, Illinois as Document No. 0800360020, as amended pursuant to that
certain First Amendment to Construction Mortgage, Assignment of Leases and Rents, Security Agreement and Fixture Filing and Assignment of Leases and Rents dated February 10, 2009 between Additional Guarantor and Agent, and as the same may be
further modified and amended from time to time. 
 CH1 Guaranty. The Guaranty given by Additional Guarantor to and for the benefit of
Agent and the Lenders, as the same may be modified, amended or ratified. 
 CH1 Indemnity Agreement. The Indemnity Agreement
Regarding Hazardous Materials made by Additional Guarantor and Guarantor in favor of the Agent and the Lenders, as the same may be modified, amended or ratified. 
 CH1 Indemnity and Guaranty Agreement. The Indemnity and Guaranty Agreement made by Guarantor in favor of the Agent and the Lenders covering the Additional Mortgaged Property, as the same may be modified,
amended or ratified. 
 CH1 Mortgage. The Construction Mortgage, Assignment of Leases and Rents, Security Agreement and Fixture
Filing dated as of December 20, 2007 from Additional Guarantor to KeyBank, as agent under a construction loan facility, recorded in the Official Records of Cook County, Illinois as Document No. 0800360019, as amended pursuant to that
certain First Amendment to Construction Mortgage, Assignment of Leases and Rents, Security Agreement and Fixture Filing and Assignment of Leases and Rents dated February     , 2009 between Additional Guarantor and Agent, and as
the same may be further modified and amended from time to time. 
 Contribution Agreement. The Contribution Agreement by and between
Borrower, Guarantor and Additional Guarantor delivered in connection with this Agreement, as the same may be modified, amended or ratified from time to time.” 
  

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 (b) By deleting the following definitions appearing in Section 1.1 of the Credit Agreement in their
entirety and inserting in lieu thereof the following: 
 “Assignment of Leases and Rents. Collectively, the Assignment of Leases
and Rents from Borrower to the Agent dated as of October 24, 2008, recorded in the Official Records of Loudoun County, Virginia as Document No. 20081027-0063823 between Borrower and Agent, as amended by that certain First Amendment to Deed
of Trust and Security Agreement and Assignment of Leases and Rents between Borrower and Agent dated February 10, 2009, and as the same may be further modified or amended from time to time, and the CH1 Assignment of Leases and Rents, pursuant to
which there shall be assigned to the Agent for the benefit of the Lenders a security interest in the interest of Borrower or Additional Guarantor, as applicable, as lessor with respect to all Additional Property Leases or Leases, as applicable of
all or any part of the Mortgaged Property or the Additional Mortgaged Property, as applicable. 
 Collateral. All of the property,
rights and interests of Borrower and Additional Guarantor which are subject to the security interests, security title, liens and mortgages created by the Security Documents, including, without limitation, the Mortgaged Property or the Additional
Mortgaged Property, as applicable. 
 Condemnation Proceeds. All compensation, awards, damages, judgments and proceeds awarded to
Borrower or Additional Guarantor by reason of any Taking, net of all reasonable and customary amounts actually expended to collect the same. 
 Guaranty. Collectively, the Guaranty dated as of October 24, 2008 given by Guarantor to and for the benefit of Agent and the Lenders and the Guaranty dated as of February     , 2009 given by Additional
Guarantor to and for the benefit of Agent and the Lenders, and the CH1 Guaranty, as the same may be modified, amended or ratified, such Guaranty to be in form and substance satisfactory to Agent. 
 Indemnity Agreement. Collectively, the Indemnity Agreement Regarding Hazardous Materials made by Borrower and Guarantor in favor of the Agent and
the Lenders and the Indemnity Agreement Regarding Hazardous Materials made by Additional Guarantor and Guarantor in favor of the Agent and the Lenders and the CH1 Indemnity Agreement, as the same may be modified, amended or ratified, pursuant to
which Borrower or Additional Guarantor, as applicable, and Guarantor agree to indemnify the Agent and the Lenders with respect to Hazardous Substances and Environmental Laws. 
 Indemnity and Guaranty Agreement. The Indemnity and Guaranty Agreement dated of even date herewith made by Guarantor in favor of the Agent and
the Lenders covering the Mortgaged Property, as the same may be modified, amended or ratified, and the CH1 Indemnity and Guaranty, such Indemnity and Guaranty Agreement to be in form and substance satisfactory to Agent. 
 Loan Documents. This Agreement, the Notes, the Guaranty, the Indemnity and Guaranty Agreement, the Contribution Agreement, the Security
Documents, and all other documents, instruments or agreements now or hereafter executed or delivered by or on behalf of Borrower, Guarantor, or Additional Guarantor in connection with the Loans. 
  

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 Management Agreements. Any agreement, whether written or oral, providing for the management of
the Mortgaged Property or the Additional Mortgaged Property, as applicable. 
 Mortgage. Collectively, the Deed of Trust and Security
Agreement dated October 24, 2008 from Borrower to a trustee named therein acting on behalf of the Agent for the benefit of the Lenders recorded in the Official Records of Loudoun County, Virginia as Document No. 20081027-0063822, as
amended by that certain First Amendment to Deed of Trust and Security Agreement and Assignment of Leases and Rents between Borrower and Agent, and as the same may be further modified or amended from time to time, and the CH1 Mortgage, pursuant to
which Borrower or Additional Guarantor, as applicable, has conveyed or granted a mortgage lien upon or a conveyance in fee simple (or of a leasehold, if applicable) of the Mortgaged Property or the Additional Mortgaged Property, as applicable, as
security for the Obligations. 
 Rent Roll. A report prepared by Borrower or Additional Guarantor, as applicable, showing for the
Mortgaged Property or the Additional Mortgaged Property, as applicable, its occupancy, lease expiration dates, lease rent and other information in substantially the form presented to Agent prior to the date hereof or in such other form as may be
reasonably acceptable to the Agent. 
 Subordination, Attornment and Non-Disturbance Agreement. An agreement among the Agent,
Borrower or Additional Guarantor and a tenant under a Lease or Additional Property Lease, as applicable, pursuant to which such tenant agrees to subordinate its rights under the Lease or Additional Property Lease to the lien or security title of the
Mortgage and agrees to recognize the Agent or its successor in interest as landlord under the Lease or Additional Property Lease in the event of a foreclosure under the Mortgage, and the Agent agrees to not disturb the possession of such tenant,
such agreement to be in form and substance reasonably satisfactory to Agent.” 
 (c) By deleting subsections (c), (f) and
(g) from the definition of “Change of Control” in Section 1.1 of the Credit Agreement and inserting in lieu thereof the following: 
 “(c) Borrower, Guarantor or Additional Guarantor consolidates with, is acquired by, or merges into or with any Person (other than a merger permitted by §8.4); or” 
 “(f) Guarantor fails to own directly or indirectly, free of any lien, encumbrance or other adverse claim, at least one hundred percent
(100%) of the economic, voting and beneficial interest of Borrower or Additional Guarantor (except that REIT may own up to one percent (1%) of Safari Ventures LLC, a Delaware limited liability company, the sole member of the sole member of
Additional Guarantor) other than any pledge of interests in Borrower permitted by Agent in connection with the Permitted Mezzanine Debt and any foreclosure on such pledge permitted under the Intercreditor Agreement; or” 
 “(g) Managing Member shall cease to be the sole member of Borrower or Tarantula Interests LLC, a Delaware limited liability company, shall cease to
be the sole member of Additional Guarantor, and Managing Member or Tarantula Interests LLC shall fail to own at least one hundred percent (100%) of the membership interest in Borrower or Additional Guarantor, as applicable, free of any lien,
encumbrance or other adverse claim other than in connection with a foreclosure contemplated by the Intercreditor Agreement; or” 
  

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 (d) In the following sections of the Credit Agreement, the term “Mortgaged Property” shall
include the “Additional Mortgaged Property” mutatis mutandis in any place it appears in such section: the definition of “Taking” in Section 1.1, Sections 3.2, 6.6, 6.16, 6.20, 6.23, 7.4(e)(i) and (iii), 7.5(b) and
(c), 7.6(b), 7.7, 7.8, 7.12, 7.15, 7.19, 8.2(iv), 8.3(h), 8.6, 8.7, 8.11, 8.16, 14.10, 14.12, 15 and 16. 
 (e) In the following sections of
the Credit Agreement, the term “Borrower” shall also include “Additional Guarantor” mutatis mutandis in any place it appears in such section: Section 3.2, the introductory paragraph of Section 6.20, Sections
6.20(a), (c), (d), (e) and (f), 6.23, 6.25, 7.5(b) and (c), 7.6(b), 7.7, 7.8, 7.12, 7.15, 8.1, 8.2, 8.3, 8.6, 8.7, 8.11, 8.16, 14.11 and 14.12 
 (f) In the following sections of the Credit Agreement, the term “Building” shall include the “Additional Property Building” mutatis mutandis in any place it appears in such section: Sections 6.23 and 7.7.

 (g) In the following sections of the Credit Agreement, the term “Lease” or “Leases” shall include the “Additional
Property Leases” mutatis mutandis in any place it appears in such section: Sections 7.4(e), 7.7(g), 7.9, 8.11 and 14.12. 
 (h)
In the following sections of the Credit Agreement, the term “Guarantor” shall include the “Additional Guarantor” mutatis mutandis in any place it appears in such section: subsection (b) of the definition of
“Material Adverse Effect” in Section 1.1, Sections 1.2(k), 2.12(d), 4.14, 5.1, 6.1(c), 6.1(d), 6.2, 6.6, 6.8, 6.9, 6.10, 6.12, 6.14, 6.17, 6.18, 6.19, 6.20, 6.26, 6.27, 6.28, 6.29, 6.31, 7.2, 7.4(l), the last paragraph of
Section 7.4, 7.5(a), 7.5(d), 7.6(a), 7.7, 7.10, 7.11, 8.13, 12.1(f), 12.1(l), 12.4, 12.5, 14.5, 14.13, 14.16, 15, 16, 17, 18.1, 18.7, 18.8, 19, 20, 21, 25, 27, 29, 33, and the form of Assignment and Acceptance Agreement attached as Exhibit C.

 (i) By adding to the end of Section 3.5 the following: 
 “Notwithstanding the foregoing, if Borrower exercises the Extension Option, then commencing
January 1, 2012 and on the first (1st) day of each calendar quarter thereafter, Borrower shall pay to Agent for the account of the Lenders
as a prepayment of principal of the Loans an amount equal to $2,000,000.00, together with any amounts due pursuant to §4.8. Any payment of a release price pursuant to §5.3 shall not reduce any payments due pursuant to this §3.5.”

 (j) By deleting in its entirety Section 5.3 of the Credit Agreement and inserting in lieu thereof the following: 
 “§ 5.3 Release of Collateral. 
 (a) Provided no Default or Event of Default shall have occurred hereunder and be continuing (or would exist immediately after giving effect to the transactions contemplated by this § 5.3(a)), the Agent shall release the Additional
Mortgaged Property from the lien or security title of the Security Documents encumbering the same upon the request of the Borrower subject to and upon the following terms and conditions: 
 (i) The Borrower shall deliver to the Agent written notice of its desire to obtain such release no later than three (3) Business Days prior to the
date on which such release is to be effected; 
  

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 (ii) The Borrower shall certify to Agent that no Default or Event of Default shall exist after giving
effect to such release; 
 (iii) The Borrower shall pay all reasonable costs and expenses of Agent in connection with such release,
including, without limitation, reasonable attorney’s fees; and 
 (iv) The Borrower or Additional Guarantor shall pay to the Agent for
the account of the Lenders a release price, which payment shall be applied to reduce the outstanding principal balance of the Loans as provided in § 3.4, in an amount equal to Fifty Million and No/100 Dollars ($50,000,000.00). 

Upon satisfaction of the terms and conditions of this § 5.3(a), the Agent shall promptly execute and deliver to Borrower and Additional
Guarantor a release of the CH1 Mortgage, the CH1 Assignment of Leases and Rents and any UCC financing statements filed in connection therewith evidencing the termination and release of Agent’s security interest and lien in the Additional
Mortgaged Property, and a release of the CH1 Guaranty, the CH1 Indemnity Agreement and the CH1 Indemnity and Guaranty Agreement all without the need for any consent from, or notice to, any Lender. 
 (b) Upon the refinancing or repayment of the Obligations in full, the Agent shall be entitled to release the Collateral from the lien and security
interest of the Security Documents and to release the Borrower and Additional Guarantor, as applicable, provided that Agent has not received a notice from the “Representative” (as defined in §14.17) or the holder of the Hedge
Obligations that any Hedge Obligation is then due and payable to the holder thereof.” 
 (k) By inserting at the end of the last
sentence of Section 6.10 of the Credit Agreement “and for Additional Guarantor is 20-8495821” before the period. 
 (l) By
deleting the introductory sentence of Section 6 of the Credit Agreement in its entirety and inserting in lieu thereof the following: 
 “Borrower, Guarantor and Additional Guarantor, as applicable, represent and warrant to the Agent and the Lenders as follows.” 
 (m) By adding at the end of Section 6.21 the following: 
 “REIT is the managing member of Safari Ventures LLC, a Delaware
limited liability company, which is the sole member of Tarantula Interests LLC, a Delaware limited liability company, which is the sole member of Additional Guarantor. REIT owns (directly or indirectly) not less than fifty percent (50%) of the
economic, voting and beneficial interest in Additional Guarantor, and Guarantor owns (directly or indirectly) not less than ninety-nine percent (99%) of (and REIT owns the balance of) the economic, voting and beneficial interests in Tarantula
Interests LLC, free and clear of all Liens.” 
  

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 (n) By adding as new Section 6.32 to the Credit Agreement the following: 
 “§6.32. Contribution Agreement. The Borrower, Guarantor and Additional Guarantor have executed and delivered the Contribution Agreement,
and the Contribution Agreement constitutes the valid and legally binding obligations of such parties enforceable against them in accordance with the terms and provisions thereof, except as enforceability is limited by bankruptcy, insolvency,
reorganization, moratorium or other laws relating to or affecting generally the enforcement of creditors’ rights and except to the extent that availability of the remedy of specific performance or injunctive relief is subject to the discretion
of the court before which any proceeding therefore may be brought.” 
 (o) By deleting in its entirety the introductory clause of
Section 7 of the Credit Agreement and inserting in lieu thereof the following: 
 “Borrower, Guarantor and Additional Guarantor, as
applicable, covenant and agree that, so long as any loan or Note is outstanding:” 
 (p) By deleting in its entirety the period at the
end of Section 7.4(l) of the Credit Agreement and inserting in lieu thereof “; and”. 
 (q) By inserting as new
Section 7.4(m) of the Credit Agreement the following: 
 “promptly after they are filed with the Internal Revenue Service, copies of
all annual federal income tax returns and amendments thereto of the Guarantor.” 
 (r) By adding to the end of Section 7.4(e) of
the Credit Agreement as new Section 7.4(e)(iv) before the semicolon the following: 
 “and (iv) an operating statement for the
Additional Mortgaged Property for each such calendar quarter and year to date (such statements to be in form reasonably satisfactory to Agent)” 
 (s) By deleting in its entirety the introductory clause of Section 8 of the Credit Agreement and inserting in lieu thereof the following: 
 “Borrower, Guarantor and Additional Guarantor, as applicable, covenant and agree that, so long as any Loan or Note is outstanding:” 

(t) By deleting in its entirety Section 8.4 of the Credit Agreement and inserting in lieu thereof the following: 
 “§ 8.4 Merger, Consolidation. Borrower and Guarantor will not, and will not permit REIT, Managing Member or Tarantuala Interests
LLC, and Guarantor will not permit any of its Subsidiaries to, become a party to any dissolution, liquidation, disposition of all or substantially all of its assets or business, merger, reorganization, consolidation or other business combination or
agree to effect any asset acquisition, stock acquisition or other acquisition individually or in a series of transactions which may have a similar effect as any of the 

  

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foregoing, in each case without the prior written consent of the Required Lenders except for (i) the merger or consolidation of one or more of the
Subsidiaries of Guarantor (other than Borrower or Additional Guarantor) with and into Guarantor (it being understood and agreed that in any such event Guarantor will be the surviving Person) and (ii) the merger or consolidation of two or more
Subsidiaries of Guarantor (other than Borrower or Additional Guarantor); provided that no such merger or consolidation shall be permitted in the event Borrower, Guarantor or Additional Guarantor is in default of any of its obligations under
this Agreement or any other Loan Document immediately before or would be after giving effect thereto.” 
 (u) By deleting in its
entirety Section 8.14 of the Credit Agreement and inserting in lieu thereof the following: 
 “§ 8.14 Equity
Pledges. Notwithstanding anything in this Agreement to the contrary, Managing Member will not create or incur or suffer to be created or incurred any Lien on any of its direct or indirect legal, equitable or beneficial interest in Borrower,
including, without limitation, any Distributions or rights to Distributions on account thereof, other than to secure the Permitted Mezzanine Debt. Tarantula Interests LLC will not create or incur or suffer to be created or incurred any Lien on any
of its direct or indirect legal, equitable or beneficial interest in Additional Guarantor, including, without limitation, any Distributions or rights to Distributions on account thereof. Furthermore, in the event of a transfer of the ownership
interests in Borrower in accordance with the Intercreditor Agreement, the owner(s) or holders(s) of such interests will not create or incur or suffer to be created any lien on any such interest or permit any transfer of a direct or indirect interest
in Borrower.” 
 (v) For the avoidance of doubt, whenever in this Amendment a term or provision of the Credit Agreement is said to
include another term, the parties hereto intend that such term or provision as amended include both such terms as if the same were more fully and completely set forth therein. 
 3. Commitment Increase. 
 (a) Pursuant
to the provisions of Section 2.11 of the Credit Agreement the Borrower hereby requests an increase in the Total Commitment from $100,000,000.00 to $250,000,000.00 pursuant to Section 2.11 of the Credit Agreement (the
“Increase”). 
 (b) Certifications. In connection with the Increase, each of the Borrower, Guarantor and Additional
Guarantor certifies that: 
 (i) As of the date hereof and as of the effective date of the Increase, both immediately before and after giving
effect to the Increase, there exists and shall exist no Default or Event of Default; 
 (ii) As of the date hereof, the representations and
warranties made by the Borrower, Guarantor and Additional Guarantor in the Loan Documents or otherwise made by or on behalf of the Borrower, Guarantor or Additional Guarantor in connection therewith or after the date thereof were true and correct in
all material respects when made, are true and correct in all material respects as of the date hereof, and shall be true and correct in all material respects as of the effective date of the Increase, both immediately before and after giving effect to
the Increase, as though such representations and warranties were made on and as of that date; and 
  

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 (iii) The principal amount of the Loan immediately after giving effect to the Increase will not exceed
either (a) forty percent (40%) of the Appraised Value (as determined by the Appraisal of the Mortgaged Property delivered to Lender on the original Closing Date) of the Mortgaged Property as set out in the Appraisal or (b) such amount
as will result in a “Debt Service Coverage Ratio” of at least 1.75 to 1.00 (based, for purposes of this calculation, on the “stabilized” Net Operating Income of the Mortgaged Property projected in the Appraisal approved by the
Lenders); and 
 (iv) Borrower has paid all fees required by that certain Fee Letter dated February 10, 2009 between KeyBank and
Borrower. 
 (c) New Commitments. 
 (i) Borrower hereby acknowledges and agrees that as of the effective date of the Increase and following satisfaction of all conditions thereto as provided in Section 2.11 of the Credit Agreement, Schedule 1.1 of
the Credit Agreement shall be deleted in its entirety and Schedule 1.1 attached hereto shall be inserted in lieu thereof. The amount of each Lender’s Commitment shall be the amount set forth on Schedule 1.1 attached hereto and the Total
Commitment under the Credit Agreement will include the Increase. 
 (ii) In connection with the Increase, (x) Raymond James,
FSB, Sovereign Bank, Mercantile Bank, National City Bank, TD Bank, N.A., and TriState Capital Bank (collectively, the “New Lenders” and each individually a “New Lender”, and together with the Existing
Lenders, collectively, the “Lenders” and each individually a “Lender”) shall, as of the date hereof, become “Lenders” under the Credit Agreement with a respective Commitment in the amount set forth
opposite such New Lender’s name on Schedule 1.1 attached hereto (each a “New Commitment” and together the “New Commitments”) and (y) KeyBank shall be issued a replacement Note in the principal face
amount of $93,864,335.00, consolidating its existing commitment with its portion of the Increase, Raymond James, FSB shall be issued a Note in the principal face amount of $15,000,000.00, Sovereign Bank shall be issued a Note in the principal face
amount of $20,000,000.00, Mercantile Bank shall be issued a Note in the principal face amount of $10,000,000.00, National City Bank shall be issued a Note in the principal face amount of $25,000,000.00, TD Bank, N.A. shall be issued a Note in the
principal face amount of $26,135,665.00 and TriState Capital Bank shall be issued a Note in the principal face amount of $10,000,000.00. Upon acceptance of such notes by the respective Lenders each such new or replacement note will be a
“Note” under the Credit Agreement. Upon execution of this Amendment, KeyBank will promptly return its current Note to the maker thereof. 
 (d) Other Conditions. All other conditions to the Increase set forth in Section 2.11 of the Credit Agreement have been satisfied. 
 (e) New Lender Agreements, Acknowledgements and Representations. By its signature below, each New Lender, subject to the terms and conditions hereof, hereby agrees to perform all obligations with respect to its
respective New Commitment as if such New Lender were an original Lender under and signatory to the Credit Agreement having a Commitment, as set forth above, equal to its respective New Commitment, which obligations shall include, but shall not be
limited to, the obligation of such New Lender to make a Loan to the Borrower with respect to its New Commitment as required under Section 2.2 of the Credit Agreement, and in any case the obligation to indemnify the Agent as provided therein.
Each New Lender makes 

  

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and confirms to the Agent and the other Lenders all of the representations, warranties and covenants of a Lender under Section 14 of the Credit
Agreement. Further, each New Lender acknowledges that it has, independently and without reliance upon the Agent, or on any affiliate or subsidiary thereof or any other Lender and based on the financial statements supplied by the Borrower and such
other documents and information as it has deemed appropriate, made its own credit analysis and decision to become a Lender under the Credit Agreement. Each New Lender also acknowledges that it will, independently and without reliance upon the Agent
or any other Lender and based on such documents and information as it shall deem appropriate at the time, continue to make its own credit decisions in taking or not taking action under the Credit Agreement or any other Loan Documents or pursuant to
any other obligation. Except as expressly provided in the Credit Agreement, the Agent shall have no duty or responsibility whatsoever, either initially or on a continuing basis, to provide any New Lender with any credit or other information with
respect to the Borrower, Guarantor or Additional Guarantor or to notify such New Lender of any Default or Event of Default. No New Lender has relied on the Agent as to any legal or factual matter in connection therewith or in connection with the
transactions contemplated thereunder. Each New Lender (i) represents and warrants that it is legally authorized to enter into this agreement, (ii) confirms that it has received a copy of the Credit Agreement, together with copies of the
most recent financial statements delivered pursuant thereto and such other documents and information (including without limitation the Loan Documents) as it has deemed appropriate to make its own credit analysis and decision to enter into this
agreement; (iii) appoints and authorizes the Agent to take such action as contractual representative on its behalf and to exercise such powers under the Loan Documents as are delegated to the Agent by the terms thereof together with such powers
as are reasonably incidental thereto; and (iv) agrees that it will become a party to and shall be bound by the Credit Agreement and the other Loan Documents to which the other Lenders are a party on the date hereof and will perform in
accordance therewith all of the obligations which are required to be performed by it as a Lender. The New Lenders acknowledge and confirm that their respective addresses for notices and Lending Office for Loans are as set forth on the signature
pages hereto. 
 (f) Increase Proceeds Applied to Construction Loan. Borrower, Guarantor, Additional Guarantor and the Lenders hereby
agree that the proceeds of the Increase to be funded according to this Amendment shall be used first to pay off the construction loan on the Additional Mortgaged Property, which construction loan is evidenced by that certain Construction Loan
Agreement dated as of December 20, 2007 (as the same may have been varied, extended, supplemented, consolidated, replaced, increased, renewed, modified or amended from time to time, the “Construction Loan Agreement”) between
Additional Guarantor, Guarantor, KeyBank, as agent for itself and such other lenders which are parties to the Construction Loan Agreement (KeyBank, for itself, and such other lenders under the Construction Loan Agreement are hereinafter referred to,
collectively, as the “Construction Loan Lenders”), and Additional Guarantor and/or Guarantor shall pay to the Construction Loan Lenders in accordance with the Construction Loan Agreement any difference between the proceeds of the
Increase and the outstanding balance, accrued interest, and any other charges payable under the Construction Loan Agreement. 
 (g)
Termination of Commitment Increase Option. Borrower’s exercise, pursuant to this Amendment, of its right to a Commitment Increase in accordance with Section 2.11 of the Credit Agreement hereby terminates any right Borrower has to
any future Commitment Increase pursuant to Section 2.11. 
  

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 4. Modification of the Indemnity Agreement. Borrower, Guarantor and Agent hereby modify and amend
the Indemnity Agreement Regarding Hazardous Materials dated as of October 24, 2008 made by Borrower and Guarantor in favor of the Agent and the Lenders by deleting from the fourth paragraph on Page 1 of the Indemnity Agreement the number
“$100,000,000.00” wherever it appears and inserting in lieu thereof the number “$250,000,000.00”. 
 5. Modification
of the Guaranty. Guarantor, Agent and the Lenders hereby modify and amend the Guaranty dated as of October 24, 2008 given by Guarantor to and for the benefit of Agent and the Lenders as follows: 
 (a) By deleting from Recital A of the Guaranty the number “One Hundred Million and No/100 Dollars ($100,000,000.00)” and inserting in lieu
thereof the number “Two Hundred Fifty Million and No/100 Dollars ($250,000,000.00)”. 
 (b) By deleting in their entirety the words
“Borrower or Guarantor” from the fifth line of the first sentence in the first paragraph of Section 2 and inserting in lieu thereof “Borrower, Guarantor or Tarantula Ventures LLC, a Delaware limited liability company
(“Additional Guarantor”)”. 
 (c) By deleting in their entirety the words “Borrower or Guarantor” from the second
sentence of the first paragraph of Section 2 and inserting in lieu thereof “Borrower, Guarantor or Additional Guarantor”. 
 (d) By deleting in their entirety the words “Borrower and/or Guarantor” from the end of the second to last sentence of Section 2 and inserting in lieu thereof the words “Borrower, Guarantor and/or Additional
Guarantor”. 
 (e) By inserting the words “Additional Guarantor or” before the words “any collateral for the Loan”
in Section 3(m). 
 (f) By deleting in their entirety the words “Borrower or Guarantor” from Section 3(n) and inserting
in lieu thereof the words “Borrower, Guarantor or Additional Guarantor”. 
 (g) By inserting the words “or any other
Person” before the words “under the Notes or the other Loan Documents” in Section 3(q). 
 (h) By inserting the words
“or Additional Guarantor” before the words “under the Notes or the other Loan Documents” in Section 3(y). 
 (i) By
inserting the words “or Additional Guarantor” after the words “right of subrogation against Borrower” in the first sentence of the last paragraph of Section 3. 
 (j) By inserting the words “or Additional Guarantor” after the words “any remedies against Borrower” in the last sentence of the last
paragraph of Section 3. 
 (k) By deleting in their entirety the words “Borrower or Guarantor” after the words
“performance of any obligations or undertakings of” in the second sentence of Section 4 and inserting in lieu thereof the words “Borrower, Guarantor or Additional Guarantor”. 
  

 11 

 (l) By inserting the words “or Additional Guarantor” after the words “require the Credit
Parties to join Borrower” and after the words “any judgment against Borrower” in the second sentence of Section 5. 
 (m)
By inserting the words “or Additional Guarantor” after the words “release or limitation of the liability of Borrower” in the fourth sentence of Section 5. 
 (n) By deleting the last two sentences of Section 10 and inserting in lieu thereof the following: 
 “Except as set forth in the Contribution Agreement, Guarantor hereby expressly waives any right of contribution from or indemnity against Borrower
or Additional Guarantor, whether at law or in equity, arising from any payments made by Guarantor pursuant to the terms of this Guaranty, and Guarantor acknowledges that Guarantor has no right whatsoever to proceed against Borrower or Additional
Guarantor for reimbursement of any such payments. In connection with the foregoing, Guarantor expressly waives any and all rights of subrogation to the Credit Parties against Borrower or Additional Guarantor, and Guarantor hereby waives any rights
to enforce any remedy which the Credit Parties may have against Borrower or Additional Guarantor and any rights to participate in any collateral for Borrower’s or Additional Guarantor’s obligations under the Loan Documents.”

 (o) By deleting in its entirety the last sentence of Section 16 and inserting in lieu thereof the following: 
 “The liability of Guarantor and Additional Guarantor as guarantors of the Loan shall be joint and several.” 
 (p) By inserting the words “or Additional Guarantor” before the words “by virtue of this Guaranty or otherwise” in the last sentence
of Section 19. 
 (q) By inserting as new Section 25 the following: 
 “Capitalized terms used herein and not otherwise defined herein shall have the meaning given such terms in the Credit Agreement.” 

6. Modification of the Indemnity and Guaranty Agreement. Guarantor, Agent and the Lenders hereby modify and amend the Indemnity and Guaranty
Agreement dated as of October 24, 2008 given by Guarantor to and for the benefit of Agent and the Lenders as follows: 
 (a) By deleting
in its entirety Section 6(f) and inserting in lieu thereof the following: 
 “(f) Any defense based upon an election of remedies by
Lender, including any election to proceed by judicial or nonjudicial foreclosure of any security, whether real property or personal property security, or by deed in lieu thereof, and whether or not every aspect of any foreclosure sale is
commercially reasonable, or any election of remedies, including remedies relating to real property or personal property security, which destroys or otherwise impairs the subrogation rights of Indemnitor or Tarantula Ventures LLC, a Delaware limited
liability company (“Additional Indemnitor”) or the rights of Indemnitor or Additional Indemnitor to proceed against Borrower for reimbursement, or both;” 
  

 12 

 (b) By deleting in its entirety Section 6(h) and inserting in lieu thereof the following:

 “(h) Any right or claim of right to cause a marshaling of the assets of Borrower, Indemnitor or Additional Indemnitor;”

 (c) By deleting in its entirety Section 6(j) and inserting in lieu thereof the following: 
 “(j) Any duty on the part of Lender to disclose to Indemnitor any facts Lender may now or hereafter know about Borrower, Additional Indemnitor or
the Collateral, regardless of whether Lender has reason to believe that any such facts materially increase the risk beyond that which Indemnitor intends to assume or has reason to believe that such facts are unknown to Indemnitor or has a reasonable
opportunity to communicate such facts to Indemnitor, it being understood and agreed that Indemnitor is fully responsible for being and keeping informed of the financial condition of Borrower and Additional Indemnitor, of the condition of the
Collateral and of any and all circumstances bearing on the risk that liability may be incurred by Indemnitor or Additional Indemnitor hereunder and under the other Loan Documents;” 
 (d) By deleting in its entirety Section 6(l) and inserting in lieu thereof the following: 
 “(l) Any inaccuracy of any representation by Borrower, Indemnitor or Additional Indemnitor or other provision contained in any Loan Document;”

 (e) By deleting in its entirety Section 6(r) and inserting in lieu thereof the following: 
 “(r) An assertion or claim that the automatic stay provided by 11 U.S.C. §362 (arising upon the voluntary or involuntary bankruptcy proceeding
of Borrower or Additional Indemnitor) or any other stay provided under any other debtor relief law (whether statutory, common law, case law or otherwise) of any jurisdiction whatsoever, now or hereafter in effect, which may be or become applicable,
shall operate or be interpreted to stay, interdict, condition, reduce or inhibit the ability of Lender to enforce any of its rights, whether now or hereafter required, which Lender may have against Indemnitor, Additional Indemnitor or the
Collateral;” 
 (f) By deleting in its entirety Section 6(u) and inserting in lieu thereof the following: 
 “(u) Any modifications of the Loan Documents or any obligation of Borrower or Additional Indemnitor relating to the Loan by operation of law or by
action of any court, whether pursuant to the Bankruptcy Code, or any other debtor relief law (whether statutory, common law, case law or otherwise) of any jurisdiction whatsoever, now or hereafter in effect, or otherwise;” 
  

 13 

 (g) By deleting in its entirety Section 6(x) and inserting in lieu thereof the following:

 “(x) The dissolution or termination of existence of Borrower or Additional Indemnitor;” 
 (h) By deleting in its entirety Section 6(ee) and inserting in lieu thereof the following: 
 “(ee) any failure or delay of Lender to commence an action against Borrower or any other Person, to assert or enforce any remedies against Borrower,
Indemnitor or Additional Indemnitor under the Loan Documents, or to realize upon any security, whether or not demand is made upon Lender to file or enforce such claim;” 
 (i) By deleting in its entirety Section 6(jj) and inserting in lieu thereof the following: 
 “(jj) any right of subrogation, reimbursement, exoneration, contribution or indemnity, or any right to enforce any remedy which Lender now has or
may hereafter have against Borrower or Additional Indemnitor or any benefit of, or any right to participate in, any security now or hereafter held by Lender; or” 
 7. References to Credit Agreement. All references in the Loan Documents to the Credit Agreement or any other Loan Document, shall be deemed a reference to the Credit Agreement or such other Loan Document, as
modified and amended herein. 
 8. Acknowledgment of Borrower, Guarantor and Additional Guarantor. Borrower, Guarantor and Additional
Guarantor hereby acknowledge, represent and agree that the Loan Documents, as modified and amended herein, remain in full force and effect and constitute the valid and legally binding obligation of Borrower, Guarantor and Additional Guarantor, as
applicable, enforceable against Borrower, Guarantor and Additional Guarantor in accordance with their respective terms, and that the execution and delivery of this Amendment and any other documents in connection therewith do not constitute, and
shall not be deemed to constitute, a release, waiver or satisfaction of Borrower’s, Guarantor’s or Additional Guarantor’s obligations under the Loan Documents. 
 9. Representations and Warranties. Borrower, Guarantor and Additional Guarantor represent and warrant to Agent and the Lenders as follows:

 (a) Authorization. The execution, delivery and performance of this Amendment and the transactions contemplated hereby (i) are
within the authority of Borrower, Guarantor and Additional Guarantor, (ii) have been duly authorized by all necessary proceedings on the part of the Borrower, Guarantor and Additional Guarantor, (iii) do not and will not conflict with or
result in any breach or contravention of any provision of law, statute, rule or regulation to which either Borrower, Guarantor or Additional Guarantor is subject or any judgment, order, writ, injunction, license or permit applicable to either
Borrower, Guarantor or Additional Guarantor, (iv) do not and will not conflict with or constitute a default (whether with the passage of time or the giving of notice, or both) under any provision of the partnership agreement or certificate,
certificate of formation, operating agreement, articles of incorporation 

  

 14 

 
or other charter documents or bylaws of, or any mortgage, indenture, agreement, contract or other instrument binding upon, Borrower, Guarantor or Additional
Guarantor or any of their respective properties or to which Borrower, Guarantor or Additional Guarantor is subject, and (v) do not and will not result in or require the imposition of any lien or other encumbrance on any of the properties,
assets or rights of Borrower, Guarantor or Additional Guarantor, other than the liens and encumbrances created by the Loan Documents. 
 (b)
Enforceability. The execution and delivery of this Amendment are valid and legally binding obligations of Borrower, Guarantor and Additional Guarantor enforceable in accordance with the respective terms and provisions hereof, except as
enforceability is limited by bankruptcy, insolvency, reorganization, moratorium or other laws relating to or affecting generally the enforcement of creditors’ rights and the effect of general principles of equity. 
 (c) Approvals. The execution, delivery and performance of this Amendment and the transactions contemplated hereby do not require the approval or
consent of any Person or the authorization, consent, approval of or any license or permit issued by, or any filing or registration with, or the giving of any notice to, any court, department, board, commission or other governmental agency or
authority other than those already obtained. 
 (d) Reaffirmation. Borrower and Guarantor reaffirm and restate as of the date hereof
each and every representation and warranty made by Borrower, Guarantor and their respective Subsidiaries in the Loan Documents or otherwise made by or on behalf of such Persons in connection therewith except for representations or warranties that
expressly relate to an earlier date. 
 10. No Default. By execution hereof, the Borrower, Guarantor and Additional Guarantor each
certify that Borrower, Guarantor and Additional Guarantor are and will be in compliance with all covenants under the Loan Documents after the execution and delivery of this Amendment, and that no Default or Event of Default has occurred and is
continuing. 
 11. Waiver of Claims. Borrower, Guarantor and Additional Guarantor acknowledge, represent and agree that none of such
Persons has any defenses, setoffs, claims, counterclaims or causes of action of any kind or nature whatsoever with respect to the Loan Documents, the administration or funding of the Loan or with respect to any acts or omissions of Agent or any
Lender, or any past or present officers, agents or employees of Agent or any Lender, and each of such Persons does hereby expressly waive, release and relinquish any and all such defenses, setoffs, claims, counterclaims and causes of action, if any.

 12. Ratification. Except as hereinabove set forth, all terms, covenants and provisions of the Credit Agreement and the other Loan
Documents remain unaltered and in full force and effect, and the parties hereto do hereby expressly ratify and confirm the Loan Documents as modified and amended herein. Nothing in this Amendment or any other document delivered in connection
herewith shall be deemed or construed to constitute, and there has not otherwise occurred, a novation, cancellation, satisfaction, release, extinguishment or substitution of the indebtedness evidenced by the Notes or the other obligations of
Borrower, Guarantor and Additional Guarantor under the Loan Documents. 
 13. Effective Date. This Amendment shall be deemed effective
and in full force and effect as of the date hereof upon the execution and delivery of this Amendment, any amendments 

  

 15 

 
to existing Loan Documents, and such other documents, opinions, title policies and other documents as Agent reasonably requires by Borrower, Guarantor,
Additional Guarantor, Agent and the Required Lenders. The Lenders hereby authorize Agent to enter into such other agreements and documents as it may deem necessary in connection with this Amendment. Without limitation, the New Lenders, as Lenders
under the Construction Loan Agreement, hereby consent to the amendment of the CH1 Mortgage and the CH1 Assignment of Leases and Rents. The Borrower will pay the reasonable fees and expenses of Agent in connection with this Amendment. 
 14. Amendment as Loan Document. This Amendment shall constitute a Loan Document. 
 15. Counterparts. This Amendment may be executed in any number of counterparts which shall together constitute but one and the same agreement.

 16. MISCELLANEOUS. THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE COMMONWEALTH OF VIRGINIA.
This Amendment shall be binding upon and shall inure to the benefit of the parties hereto and their respective permitted successors, successors-in-title and assigns as provided in the Credit Agreement. 
 [Remainder of Page Intentionally Left Blank] 
  

 16 

 IN WITNESS WHEREOF, the parties hereto have hereto set their hands and affixed their seals as of
the day and year first above written. 
  

											
	BORROWER:
	
	GRIZZLY VENTURES LLC, a Delaware limited
liability company
		
	By:	 	Grizzly Equity LLC, a Delaware limited liability company, its Managing Member
			
		 	By:	 	DuPont Fabros Technology, L.P., a Maryland
		 		 	limited partnership, its Managing Member
				
		 		 	By:	 	DuPont Fabros Technology, Inc., a
		 		 		 	Maryland corporation, its General Partner
					
		 		 		 	By:	 	 /s/ Richard A. Montfort

		 		 		 	Name:	 	 Richard A. Montfort

		 		 		 	Title:	 	 General Counsel and Secretary

					
		 		 		 		 	 (SEAL)

	
	GUARANTOR:
	
	DUPONT FABROS TECHNOLOGY, L.P., a Maryland
limited partnership
		
	By:	 	DuPont Fabros Technology, Inc., a Maryland
corporation, its Sole General Partner
			
		 	By:	 	 /s/ Richard A. Montfort

		 	Name:	 	 Richard A. Montfort

		 	Title:	 	 General Counsel and Secretary

					
		 		 		 		 	 (SEAL)

 [Signatures continued on next page.] 

									
	ADDITIONAL GUARANTOR:
	
	TARANTULA VENTURES LLC, a Delaware limited
liability company
		
	By:	 	Tarantula Interests LLC, a Delaware limited liability
company, its Managing Member
			
		 	By:	 	Safari Ventures LLC, a Delaware limited
liability company, its Managing Member
				
		 		 	By:	 	DuPont Fabros Technology, Inc., a
Maryland corporation, its Managing
Member
					
		 		 		 	By:	 	 /s/ Richard A. Montfort

		 		 		 	Name:	 	 Richard A. Montfort

		 		 		 	Title:	 	 General Counsel and Secretary

 [Signatures continued on next page.] 

			
	LENDERS:
	
	KEYBANK NATIONAL ASSOCIATION
	individually and as Agent
		
	By:	 	 /s/ John Scott

	Name:	 	 John Scott

	Title:	 	 Vice President

	
	UBS LOAN FINANCE LLC, as a Lender
		
	By:	 	 /s/ Irja R. Otsa

	Name:	 	 Irja R. Otsa

	Title:	 	 Associate Director

		
	By:	 	 /s/ Mary E. Evans

	Name:	 	 Mary E. Evans

	Title:	 	 Associate Director

	
	CATERPILLAR FINANCIAL SERVICES
CORPORATION, as a Lender
		
	By:	 	 /s/ R.S. Freistat

	Name:	 	 Roger Scott Freistat

	Title:	 	 Credit Manager

	
	LAKE FOREST BANK & TRUST COMPANY,
an Illinois banking corporation, as a Lender
		
	By:	 	 /s/ Stephen L. Madden

	Name:	 	 Stephen L. Madden

	Title:	 	 Executive Vice President

 [Signatures continued on next page.] 

			
	NEW LENDERS:
	
	SOVEREIGN BANK, as a Lender
		
	By:	 	 /s/ Stephen E. Burse

	Name:	 	 Stephen E. Burse

	Title:	 	 Vice President

	
	RAYMOND JAMES, FSB, as a Lender
		
	By:	 	 /s/ Thomas G. Scott

	Name:	 	 Thomas G. Scott

	Title:	 	 Senior Vice President

	
	MERCANTILE BANK, as a Lender
		
	By:	 	 /s/ Michael F. Waters

	Name:	 	 Michael F. Waters

	Title:	 	 Senior Vice President

	
	NATIONAL CITY BANK, as a Lender
		
	By:	 	 /s/ Sean Apicella

	Name:	 	 Sean Apicella

	Title:	 	 Assistant Vice President

	
	TD BANK, N.A., as a Lender
		
	By:	 	 /s/ David Yesue

	Name:	 	 David Yesue

	Title:	 	 Assistant Vice President

	
	TRISTATE CAPITAL BANK, as a Lender
		
	By:	 	 /s/ Kent Nelson

	Name:	 	 Kent Nelson

	Title:	 	 SVP

 Note: Notice Addresses for the New Lenders are set forth under their respective names on
Schedule 1.1. 

 SCHEDULE 1.1 
 LENDERS AND COMMITMENTS 
  

							
	 Lender
	  	Commitment	  	Commitment Percentage	 
			
	KeyBank National Association	  	$	93,864,335.00	  	37.5	%
	UBS Loan Finance LLC	  	$	20,000,000.00	  	8.0	%
	Caterpillar Financial Services Corporation	  	$	15,000,000.00	  	6.0	%
	Lake Forest Bank & Trust Company	  	$	15,000,000.00	  	6.0	%
			
	 Raymond James, FSB
  
 Lending Office (all types of Loans):
	  	$
	15,000,000.00
	  	6.0
	%

	_________________________	  			  		
	_________________________	  			  		
	_________________________	  			  		
	 Attention:                                  
 Fax No.:                                    

 Telephone
No.:                         
	  			  		
			
	 Sovereign Bank
  
 75 State St., MA1 SST 04-11
 Boston, MA 02109
 Attention: T. Gregory Donohue
 Fax No.: 617-757-5652
 Telephone No.: 617-757-5578
	  	$	20,000,000.00	  	8.0	%
			
	 Mercantile Bank
  
 200 N 33rd St., P.O. Box 3455
 Quincy, IL 62305-3455
 Attention: Michael F. Waters
 Fax
No.: 217-223-5032
 Telephone No.: 217-214-1314
	  	$	10,000,000.00	  	4.0	%
			
	 National City Bank
  
 2000 Auburn Drive 01-86CH
 Beachwood, OH 44122
 Attention: Sean Apicella
 Fax No.: 216-488-0214
 Telephone No.: 216-488-3687
	  	$	25,000,000.00	  	10.0	%

					
	 	  	 	  	 
	 TD Bank, N.A.
  
 15 Park Street
 Framingham, MA 01702
 Attention: David Yesue
 Fax No.: 508-879-8237
 Telephone
No.: 508-424-7174
	  	$26,135,665.00	  	10.5%
			
	 TriState Capital Bank
  
 789 E. Lancaster Ave., Suite 240
 Villanova, PA 19085
 Attention: Kent Nelson, SVP
 Fax No.: 610-581-7110
 Telephone No.: 610-526-6773
	  	$10,000,000.00	  	4.0%
			
	TOTAL	  	$250,000,000.00	  	100%Exhibit 10.6

 Exhibit 10.6 
 GUARANTY 
 Property Commonly Known as 
 “Data Center Facility, ACC4, Ashburn, Virginia” 
 THIS GUARANTY
(“Guaranty”) made as of February 10, 2009, by TARANTULA VENTURES LLC, a Delaware limited liability company (“Guarantor”), to and for the benefit of KEYBANK NATIONAL ASSOCIATION (“KeyBank”), a
national banking association, as Agent (“Agent”), and KeyBank and the other lenders now or hereafter a party to the Credit Agreement (as hereinafter defined) (the “Lenders”) (Agent and the Lenders, and their
successors and assigns, are hereinafter referred to collectively as the “Credit Parties”). 
 R E C I T A L S 

 WHEREAS, the Guarantor is the direct owner of certain real property more particularly described in that certain Construction Mortgage,
Assignment of Leases and Rents and Fixture Filing dated as of December 20, 2007 from Owner to KeyBank, as agent under a construction loan facility, recorded in the Official Records of Cook County, Illinois as Document No. 0800360019, as
amended by that certain First Amendment to Construction Mortgage, Assignment of Leases and Rents and Fixture Filing and Assignment of Leases and Rents dated of even date herewith (as modified and amended from time to time, the “CH1
Mortgage”; such real property is hereinafter referred to as the “Land”; the Land, together with all improvements now or hereafter located in, on or under the Land, collectively, the “Property”); 
 WHEREAS, Grizzly Ventures LLC, a Delaware limited liability company (“Borrower”), DuPont Fabros Technology, L.P., a Maryland limited
partnership (“Parent Guarantor”), KeyBank, as Agent, and the Lenders entered into that certain Credit Agreement dated as of October 24, 2008, as amended by that certain First Amendment to Credit Agreement and Other Loan Documents (the
“Term Loan Amendment”) dated as of even date herewith between Borrower, Parent Guarantor, Guarantor, KeyBank, as Agent and the Lenders (as the same may be varied, extended, supplemented, consolidated, replaced, increased, renewed, modified
or amended from time to time, the “Credit Agreement”); 
 WHEREAS, pursuant to the Credit Agreement, Lenders made a loan to
Borrower in the original principal amount of $100,000,000.00, increasable up to $250,000,000.00 in accordance with the terms of the Credit Agreement (the “Loan”), which Loan is evidenced by, among other things, the Notes made by Borrower
to the order of Lenders and delivered from time to time under the Credit Agreement (together with all amendments, modifications, consolidations, increases, supplements and extensions thereof, and together with the new notes and replacement notes
executed in connection with the commitment increase pursuant to the Term Loan Amendment (as hereinafter defined), collectively, the “Notes”); 
 WHEREAS, Borrower desires to increase the “Total Commitment” under the Credit Agreement; 
 WHEREAS, Guarantor will derive material financial benefit from the increase in the Total Commitment under the Credit Agreement pursuant to the Term Loan Amendment; 

 WHEREAS, the Credit Parties have relied on the statements and agreements contained herein in agreeing to
execute the Term Loan Amendment; and 
 WHEREAS, in order to induce additional lenders to join in funding the increase of the Total
Commitment, Lenders require that Guarantor enter into this Guaranty as a condition precedent to the execution of the Term Loan Amendment by Lenders. 
 AGREEMENTS 
 NOW, THEREFORE, intending to be legally bound, Guarantor, in consideration of the matters described in
the foregoing Recitals, which Recitals are incorporated herein and made a part hereof, and for other good and valuable consideration the receipt and sufficiency of which are acknowledged, hereby covenants and agrees for the benefit of the Credit
Parties and their respective successors, indorsees, transferees, participants and assigns as follows: 
 1. Guarantor, absolutely,
unconditionally, and irrevocably guarantees: 
 (a) the full and prompt payment of the principal of and interest on the Notes when due,
whether at stated maturity, upon acceleration or otherwise, and at all times thereafter, and the full and prompt payment of all sums which may now be or may hereafter become due and owing under the Notes, the Credit Agreement and the other Loan
Documents; 
 (b) the full, complete and punctual observance, performance and satisfaction of all of the other obligations, duties, covenants
and agreements of Borrower under the Credit Agreement and the other Loan Documents; 
 (c) the full and prompt payment of any Enforcement
Costs (as hereinafter defined in Section 7 hereof); and 
 (d) the full and prompt payment of all of the Hedge Obligations (as
defined in the Credit Agreement). 
 All amounts due, debts, liabilities, payment obligations and other obligations described in subsections
(a) through (d) of this Section 1 are referred to herein as the “Guaranteed Obligations.” 
 2. In the event
of any default by Borrower in the payment or performance of the Guaranteed Obligations and the expiration of any applicable cure or grace period, Guarantor agrees, on demand by Agent or the Credit Parties (which demand may be made concurrently with
notice to Borrower that Borrower is in default of its obligations), to pay and perform all the Guaranteed Obligations regardless of any defense, right of setoff or claims which Borrower, Guarantor or Parent Guarantor may have against any of the
Credit Parties. The Credit Parties shall have the right, at their option, either before, during or after commencing foreclosure or sale proceedings, as the case may be, and before, during or after pursuing any other right or remedy against Borrower,
Guarantor or Parent Guarantor, to perform any and all of the Guaranteed Obligations by or through any agent of its selection, all as the Credit Parties in their sole discretion deem proper, and Guarantor shall indemnify and hold the Credit Parties
free and harmless of, and against any and all loss, damage, cost, expense, injury, or liability the Credit Parties may suffer or incur in connection with the exercise of their rights under this Guaranty or 

  

 2 

 
the performance of the Guaranteed Obligations. Furthermore, the Credit Parties shall not have any obligation to protect or insure any collateral for the
Loan, nor shall the Credit Parties have any obligation to perfect their security interest in any collateral for the Loan. 
 All of the
remedies set forth herein and/or provided for in any of the Loan Documents or at law or equity shall be available to the Credit Parties, and the choice by the Credit Parties of one such alternative over another shall not be subject to question or
challenge by Guarantor or any other Person, nor shall any such choice be asserted as a defense, setoff, or failure to mitigate damages in any action, proceeding, or counteraction by the Credit Parties to recover or seeking any other remedy under
this Guaranty, nor shall such choice preclude the Credit Parties from subsequently electing to exercise a different remedy. The parties have agreed to the alternative remedies hereinabove specified in part because they recognize that the choice of
remedies in the event of a failure hereunder will necessarily be and should properly be a matter of good faith business judgment, which the passage of time and events may or may not prove to have been the best choice to maximize recovery by the
Credit Parties at the lowest cost to Borrower, Parent Guarantor and/or Guarantor. It is the intention of the parties that such good faith choice by the Credit Parties be given conclusive effect regardless of such subsequent developments. 

3. Guarantor hereby agrees that its obligations hereunder shall not be affected or impaired by, and hereby waives and agrees not to assert or take
advantage of any defense based on: 
 (a) (i) any change in the amount, interest rate or due date or other term of any of the obligations
hereby guaranteed, (ii) any change in the time, place or manner of payment of all or any portion of the obligations hereby guaranteed, (iii) any amendment or waiver of, or consent to the departure from or other indulgence with respect to,
the Credit Agreement, any other Loan Document, or any other document or instrument evidencing or relating to any obligations hereby guaranteed, or (iv) any waiver, renewal, extension, addition, or supplement to, or deletion from, or any other
action or inaction under or in respect of, the Credit Agreement, any of the other Loan Documents, or any other documents, instruments or agreements relating to the obligations hereby guaranteed or any other instrument or agreement referred to
therein or evidencing any obligations hereby guaranteed or any assignment or transfer of any of the foregoing; 
 (b) any subordination of
the payment of the obligations hereby guaranteed to the payment of any other liability of Borrower or any other Person; 
 (c) any act or
failure to act by Borrower or any other Person which may adversely affect Guarantor’s subrogation rights, if any, against Borrower or any other Person to recover payments made under this Guaranty; 
 (d) any nonperfection or impairment of any security interest or other lien on any collateral, if any, securing in any way any of the obligations hereby
guaranteed or any failure on the part of the Credit Parties to ascertain the extent or nature of any collateral or any insurance or other rights with respect thereto, or the liability of any party liable under the Loan Documents or the obligations
evidenced or secured thereby; 
  

 3 

 (e) any application of sums paid by Borrower or any other Person with respect to the Guaranteed
Obligations, regardless of what liabilities of Borrower remain unpaid; 
 (f) any defense of Borrower, including without limitation, the
invalidity, illegality or unenforceability of any of the Guaranteed Obligations; 
 (g) either with or without notice to Guarantor, any
renewal, extension, modification, amendment or another changes in the Guaranteed Obligations, including but not limited to any material alteration of the terms of payment or performance of the Guaranteed Obligations; 
 (h) any statute of limitations in any action hereunder or for the collection of the Notes or for the payment or performance of any obligation hereby
guaranteed; 
 (i) the incapacity, lack of authority, death or disability of Borrower or any other Person or entity, or the failure of the
Credit Parties to file or enforce a claim against the estate (either in administration, bankruptcy or in any other proceeding) of Borrower or Guarantor or any other Person; 
 (j) the dissolution or termination of existence of Borrower, Guarantor or any other Person; 
 (k) the voluntary or involuntary liquidation, sale or other disposition of all or substantially all of the assets of Borrower or Guarantor or any other
Person; 
 (l) the voluntary or involuntary receivership, insolvency, bankruptcy, assignment for the benefit of creditors, reorganization,
assignment, composition, or readjustment of, or any similar proceeding affecting, Borrower or Guarantor or any other Person, or any of Borrower’s or Guarantor’s or any other Person’s properties or assets; 
 (m) an assertion or claim that the automatic stay provided by 11 U.S.C. §362 (arising upon the voluntary or involuntary bankruptcy proceeding of
Borrower) or any other stay provided under any other debtor relief law (whether statutory, common law, case law or otherwise) of any jurisdiction whatsoever, now or hereafter in effect, which may be or become applicable, shall operate or be
interpreted to stay, interdict, condition, reduce or inhibit the ability of the Credit Parties to enforce any of their rights, whether now or hereafter required, which the Credit Parties may have against Guarantor or Parent Guarantor or any
collateral for the Loan; 
 (n) any right or claim of right to cause a marshaling of the assets of Borrower, Parent Guarantor or Guarantor;

 (o) the damage, destruction, condemnation, foreclosure or surrender of all or any part of any collateral or the Property or any of the
improvements located thereon; 
 (p) the failure of the Credit Parties to give notice of the existence, creation or incurring of any new or
additional indebtedness or obligation of Borrower or of any action or nonaction on the part of any other person whomsoever in connection with any obligation hereby guaranteed; 
  

 4 

 (q) any failure or delay of the Credit Parties to commence an action against Borrower or any other
Person, to assert or enforce any remedies against Borrower or any other Person under the Notes or the other Loan Documents, or to realize upon any security; 
 (r) any failure of any duty on the part of the Credit Parties to disclose to Guarantor any facts they may now or hereafter know regarding Borrower (including, without limitation Borrower’s financial condition),
any other person or entity, any collateral, or any other assets or liabilities of such person or entity, whether such facts materially increase the risk to Guarantor or not (it being agreed that Guarantor assumes responsibility for being informed
with respect to such information); 
 (s) failure to accept or give notice of acceptance of this Guaranty by the Credit Parties; 

(t) failure to make or give notice of presentment and demand for payment of any of the indebtedness or performance of any of the obligations hereby
guaranteed; 
 (u) failure to make or give protest and notice of dishonor or of default to Guarantor or to any other party with respect to
the indebtedness or performance of obligations hereby guaranteed; 
 (v) any and all other notices whatsoever to which Guarantor might
otherwise be entitled; 
 (w) any lack of diligence by the Credit Parties in collection, protection or realization upon any collateral
securing the payment of the indebtedness or performance of obligations hereby guaranteed; 
 (x) the invalidity or unenforceability of the
Notes, or any of the other Loan Documents, or any assignment or transfer of the foregoing; 
 (y) the compromise, settlement, release or
termination of any or all of the obligations of Borrower or Parent Guarantor under the Notes or the other Loan Documents; 
 (z) any transfer
by Borrower or any other Person of all or any part of the security encumbered by the Loan Documents; 
 (aa) any right to require the Credit
Parties to proceed against Borrower or any other Person or to proceed against or exhaust any security held by the Credit Parties at any time or to pursue any other remedy in the Credit Parties’ power or under any other agreement before
proceeding against Guarantor hereunder or under any other Loan Document; 
 (bb) the failure of the Credit Parties to perfect any security or
to extend or renew the perfection of any security; 
 (cc) any principle or provision of law, statutory or otherwise, which is or might be in
conflict with the terms and provisions of this Guaranty; 
  

 5 

 (dd) any inaccuracy of any representation or other provision contained in any Loan Document; 

(ee) any sale or assignment of the Loan Documents, or any interest therein; 
 (ff) any and all rights, benefits and defenses which might otherwise be available under the provisions of any other applicable statues, rules or common
law principals or provisions which might operate to limit Guarantor’s liability under, or the enforcement of, this Guaranty; or 
 (gg)
to the fullest extent permitted by law, any other legal, equitable or surety defenses whatsoever to which Guarantor might otherwise be entitled, it being the intention that the obligations of Guarantor hereunder are absolute, unconditional and
irrevocable. 
 Guarantor understands that the exercise by the Credit Parties of certain rights and remedies may affect or eliminate
Guarantor’s right of subrogation against Borrower or Parent Guarantor and that Guarantor may therefore incur partially or totally nonreimbursable liability hereunder. Nevertheless, Guarantor hereby authorizes and empowers the Credit Parties,
their successors, endorsees and assigns, to exercise in its or their sole discretion, any rights and remedies, or any combination thereof, which may then be available, including, without limitation, any remedies against Borrower or Parent Guarantor
with respect to the Notes, it being the purpose and intent of Guarantor that the obligations hereunder shall be absolute, continuing, independent and unconditional under any and all circumstances. 
 4. Guarantor hereby consents and agrees that the Credit Parties may at any time, and from time to time, without thereby releasing Guarantor from any
liability hereunder and without notice to or further consent from Guarantor or any other Person, either with or without consideration: release or surrender any lien or other security of any kind or nature whatsoever held by them or by any person,
firm or corporation on their behalf or for their account, securing any indebtedness or liability hereby guaranteed; substitute for any collateral so held by them, other collateral of like kind, or of any kind; modify the terms of the Notes or the
Loan Documents; extend or renew the Notes for any period; grant releases, compromises and indulgences with respect to the Notes or the Loan Documents and to any persons or entities now or hereafter liable thereunder or hereunder; release any other
guarantor, surety, endorser or accommodation party of the Notes or any other Loan Document; or take or fail to take any action of any type whatsoever. No such action which the Credit Parties shall take or fail to take in connection with the Notes or
the Loan Documents, or any of them, or any security for the payment of the indebtedness of Borrower to the Credit Parties or for the performance of any obligations or undertakings of Borrower, Parent Guarantor or Guarantor, nor any course of dealing
with Borrower or any other Person, shall release Guarantor’s obligations hereunder, affect this Guaranty in any way or afford Guarantor any recourse against the Credit Parties. The provisions of this Guaranty shall extend and be applicable to
all replacements, supplements, renewals, amendments, extensions, consolidations, restatements and modifications of the Notes and the other Loan Documents, and any and all references herein to the Notes and the other Loan Documents shall be deemed to
include any such replacements, supplements, renewals, extensions, amendments, consolidations, restatements or modifications thereof. Without limiting the generality of the foregoing, Guarantor acknowledges the terms of Section 18 of the Credit
Agreement and agrees that this Guaranty shall extend and be applicable to each new or 

  

 6 

 
replacement note delivered by Borrower pursuant thereto without notice to or further consent from Guarantor. Guarantor acknowledges that no representations
of any kind whatsoever have been made by the Credit Parties. No modification or waiver of any of the provisions of this Guaranty shall be binding upon the Credit Parties except as expressly set forth in a writing duly signed and delivered by Agent
in accordance with the provisions of the Credit Agreement. 
 5. This is an absolute, present and continuing guaranty of payment and
performance and not of collection. Guarantor agrees that this Guaranty may be enforced by the Credit Parties without the necessity at any time of resorting to or exhausting any other security or collateral given in connection herewith or with the
Notes, Credit Agreement, CH1 Mortgage or any of the other Loan Documents through foreclosure or sale proceedings, as the case may be, under the CH1 Mortgage or otherwise, or resorting to any other guaranties, and Guarantor hereby waives any right to
require the Credit Parties to join Borrower or Parent Guarantor in any action brought hereunder or to commence any action against or obtain any judgment against Borrower or Parent Guarantor or to pursue any other remedy or enforce any other right.
Guarantor further agrees that nothing contained herein or otherwise shall prevent the Credit Parties from pursuing concurrently or successively all rights and remedies available to them at law and/or in equity or under the Notes, Credit Agreement,
CH1 Mortgage or any other Loan Documents, and the exercise of any of their rights or the completion of any of their remedies shall not constitute a discharge of Guarantor’s obligations hereunder, it being the purpose and intent of Guarantor
that the obligations of Guarantor hereunder shall be absolute, independent and unconditional under any and all circumstances whatsoever. None of Guarantor’s obligations under this Guaranty or any remedy for the enforcement thereof shall be
impaired, modified, changed or released in any manner whatsoever by any impairment, modification, change, release or limitation of the liability of Borrower or Parent Guarantor under the Notes, Credit Agreement, CH1 Mortgage or other Loan Documents
or by reason of the bankruptcy of Borrower or by reason of any creditor or bankruptcy proceeding instituted by or against Borrower. This Guaranty shall continue to be effective or be reinstated (as the case may be) if at any time payment of all or
any part of any sum payable pursuant to the Notes, Credit Agreement, CH1 Mortgage or any other Loan Document is rescinded or otherwise required to be returned by the Credit Parties upon the insolvency, bankruptcy, dissolution, liquidation, or
reorganization of Borrower, or upon or as a result of the appointment of a receiver, intervenor, custodian or conservator of or trustee or similar officer for, Borrower or any substantial part of its property, or otherwise, all as though such
payment to the Credit Parties had not been made, regardless of whether the Credit Parties contested the order requiring the return of such payment. In the event of the foreclosure of the Mortgage and of a deficiency, Guarantor hereby promises and
agrees forthwith to pay the amount of such deficiency notwithstanding the fact that recovery of said deficiency against Borrower would not be allowed by applicable law; however, the foregoing shall not be deemed to require that the Credit Parties
institute foreclosure proceedings or otherwise resort to or exhaust any other collateral or security prior to or concurrently with enforcing this Guaranty. 
 6. In the event any Credit Party or any holder of the Notes shall assign a Note to any other Credit Party or other entity to secure a loan from such Credit Party or other entity to any Credit Party or such holder for
an amount not in excess of the amount which will be due, from time to time, from Borrower to such Credit Party under such Note with interest not in excess of the rate of interest which is payable by Borrower to such Credit Party under such Note,
Guarantor will accord full recognition thereto and agree that all rights and remedies of such Credit Party or such holder hereunder shall be enforceable against Guarantor by such Credit 

  

 7 

 
Party or other entity with the same force and effect and to the same extent as would have been enforceable by such Credit Party or such holder but for such
assignment; provided, however, that unless such Credit Party shall otherwise consent in writing, such Credit Party shall have an unimpaired right, prior and superior to that of its assignee or transferee, to enforce this Guaranty for the Credit
Parties’ benefit to the extent any portion of the Indebtedness or any interest therein is not assigned or transferred. 
 7. If:
(a) this Guaranty is placed in the hands of an attorney for collection or is collected through any legal proceeding; (b) an attorney is retained to represent the Credit Parties in any bankruptcy, reorganization, receivership, or other
proceedings affecting creditors’ rights and involving a claim under this Guaranty; (c) an attorney is retained to provide advice or other representation with respect to this Guaranty; or (d) an attorney is retained to represent any
one or more of the Credit Parties in any proceedings whatsoever in connection with this Guaranty and the Credit Parties prevail in any such proceedings, then Guarantor shall pay to the Credit Parties upon demand all attorney’s fees, costs and
expenses incurred in connection therewith (all of which are referred to herein as “Enforcement Costs”), in addition to all other amounts due hereunder, regardless of whether all or a portion of such Enforcement Costs are incurred in
a single proceeding brought to enforce this Guaranty as well as the other Loan Documents. 
 8. The parties hereto intend and believe that
each provision in this Guaranty comports with all applicable local, state and federal laws and judicial decisions. However, if any provision or provisions, or if any portion of any provision or provisions, in this Guaranty is found by a court of law
to be in violation of any applicable local, state or federal ordinance, statute, law, administrative or judicial decision, or public policy, and if such court should declare such portion, provision or provisions of this Guaranty to be illegal,
invalid, unlawful, void or unenforceable as written, then it is the intent of all parties hereto that such portion, provision or provisions shall be given force to the fullest possible extent that they are legal, valid and enforceable, that the
remainder of this Guaranty shall be construed as if such illegal, invalid, unlawful, void or unenforceable portion, provision or provisions were not contained therein, and that the rights, obligations and interest of the Credit Parties or the holder
of the Notes under the remainder of this Guaranty shall continue in full force and effect. 
 9. TO THE GREATEST EXTENT PERMITTED
BY LAW, GUARANTOR HEREBY WAIVES ANY AND ALL RIGHTS TO REQUIRE MARSHALLING OF ASSETS BY THE CREDIT PARTIES. WITH RESPECT TO ANY SUIT, ACTION OR PROCEEDINGS RELATING TO THIS GUARANTY (EACH, A “PROCEEDING”), THE CREDIT PARTIES AND
GUARANTOR IRREVOCABLY (A) SUBMIT TO THE NON-EXCLUSIVE JURISDICTION OF THE STATE AND FEDERAL COURTS HAVING JURISDICTION IN THE COMMONWEALTH OF VIRGINIA, AND (B) WAIVES ANY OBJECTION WHICH IT MAY HAVE AT ANY TIME TO THE LAYING OF VENUE OF
ANY PROCEEDING BROUGHT IN ANY SUCH COURT, WAIVE ANY CLAIM THAT ANY PROCEEDING HAS BEEN BROUGHT IN AN INCONVENIENT FORUM AND FURTHER WAIVE THE RIGHT TO OBJECT, WITH RESPECT TO SUCH PROCEEDING, THAT SUCH COURT DOES NOT HAVE JURISDICTION OVER SUCH
PARTY. NOTHING IN THIS GUARANTY SHALL PRECLUDE THE CREDIT PARTIES FROM BRINGING A PROCEEDING IN ANY OTHER JURISDICTION NOR WILL THE BRINGING OF A PROCEEDING IN ANY ONE OR MORE JURISDICTIONS PRECLUDE THE BRINGING OF A PROCEEDING IN ANY OTHER 

  

 8 

 
JURISDICTION. THE CREDIT PARTIES AND GUARANTOR FURTHER AGREE AND CONSENT THAT, IN ADDITION TO ANY METHODS OF SERVICE OF PROCESS PROVIDED FOR UNDER
APPLICABLE LAW, ALL SERVICE OF PROCESS IN ANY PROCEEDING IN ANY COMMONWEALTH OF VIRGINIA OR UNITED STATES COURT SITTING IN THE COMMONWEALTH OF VIRGINIA MAY BE MADE BY CERTIFIED OR REGISTERED MAIL, RETURN RECEIPT REQUESTED, DIRECTED TO THE APPLICABLE
PARTY AT THE ADDRESS INDICATED BELOW, AND SERVICE SO MADE SHALL BE COMPLETE UPON RECEIPT; EXCEPT THAT IF SUCH PARTY SHALL REFUSE TO ACCEPT DELIVERY, SERVICE SHALL BE DEEMED COMPLETE FIVE (5) DAYS AFTER THE SAME SHALL HAVE BEEN SO MAILED.
FURTHERMORE, THE GUARANTOR HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY LAW, THE BENEFITS OF SECTIONS 49-25 AND 49-26 OF THE CODE OF VIRGINIA (1950), AS AMENDED. 
 10. Any indebtedness of Borrower to Guarantor now or hereafter existing is hereby subordinated to the payment and performance of the Guaranteed Obligations. Guarantor agrees that, until the entire Indebtedness has
been paid in full and all other Guaranteed Obligations have been paid and performed, Guarantor will not seek, accept, or retain for its own account, any payment from Borrower on account of such subordinated debt. Any payments to Guarantor on account
of such subordinated debt shall be collected and received by Guarantor in trust for the Credit Parties and shall be paid over to the Credit Parties on account of the Indebtedness without impairing or releasing the obligations of Guarantor hereunder.
Guarantor will not, by paying any sum recoverable hereunder (whether or not demanded by the Credit Parties) or by any means or on any other ground, claim any set-off or counterclaim against Borrower in respect of any liability of Guarantor to
Borrower or, in proceedings under federal bankruptcy law or insolvency proceedings of any nature, prove in competition with the Credit Parties in respect of any payment hereunder or be entitled to have the benefit of any counterclaim or proof of
claim or dividend or payment by or on behalf of Borrower or the benefit of any other security for any of the Guaranteed Obligations hereby guaranteed which, now or hereafter, the Credit Parties may hold or in which they may have any share. Except as
set forth in the Contribution Agreement, Guarantor hereby expressly waives any right of contribution from or indemnity against Borrower or Parent Guarantor, whether at law or in equity, arising from any payments made by Guarantor pursuant to the
terms of this Guaranty, and Guarantor acknowledges that Guarantor has no right whatsoever to proceed against Borrower or Parent Guarantor for reimbursement of any such payments. In connection with the foregoing, Guarantor expressly waives any and
all rights of subrogation to the Credit Parties against Borrower or Parent Guarantor, and Guarantor hereby waives any rights to enforce any remedy which the Credit Parties may have against Borrower or Parent Guarantor and any rights to participate
in any collateral for Borrower’s or Parent Guarantor’s obligations under the Loan Documents. 
 11. Any amounts received by the
Credit Parties from any source on account of the Loan may be utilized by the Credit Parties for the payment and performance of the Guaranteed Obligations and in such order as the Credit Parties may from time to time elect. Additionally, if the
Guaranteed Obligations guaranteed hereby are less than the full indebtedness evidenced by the Notes, all rents, proceeds and avails of the Property, including proceeds of realization of the Credit Parties’ collateral and all other payments and
collections, shall be deemed applied on the indebtedness of Borrower to the Credit Parties that is not guaranteed by Guarantor until such unguaranteed Guaranteed Obligations of Borrower to the Credit Parties has been fully repaid before being
applied upon the Guaranteed Obligations guaranteed by Guarantor. 
  

 9 

 12. GUARANTOR AND THE CREDIT PARTIES (BY THEIR ACCEPTANCE HEREOF) HEREBY WAIVE ANY RIGHT TO A
TRIAL BY JURY IN ANY ACTION OR PROCEEDING TO ENFORCE OR DEFEND ANY RIGHT UNDER THIS GUARANTY OR ANY OTHER LOAN DOCUMENT OR RELATING THERETO OR ARISING FROM THE LENDING RELATIONSHIP WHICH IS THE SUBJECT OF THIS GUARANTY AND AGREE THAT ANY SUCH ACTION
OR PROCEEDING SHALL BE TRIED BEFORE A COURT AND NOT BEFORE A JURY. 
 13. All notices, demands, requests or other communications to be
sent by one party to another hereunder or required by law shall be given and become effective as provided in the Credit Agreement and shall be sent to Guarantor at the following address: 
 Tarantula Ventures LLC 
 c/o DuPont Fabros
Technology, Inc. 
 1212 New York Avenue, N.W. 
 Suite 900 
 Washington, DC 20005 
 Attn: Chief Financial Officer 
 Telecopy No.:
(202) 728-0220 
 With copies to: 
 Tarantula Ventures LLC 
 c/o DuPont Fabros Technology, Inc. 
 1212 New York Avenue, N.W. 
 Suite 900

 Washington, DC 20005 
 Attn:
General Counsel 
 Telecopy No.: (202) 728-0220 
 and 
 Cooley, Godward & Kronish LLP 
 One Freedom Square 
 11951 Freedom Drive

 Reston, Virginia 20190 
 Attn:
John H. Toole, Esq. 
 Telecopy No.: (703) 456-8100 
 14. In order to induce the Lenders to execute the Term Loan Amendment, Guarantor makes the following representations and warranties to the Credit Parties set forth in this Section. Guarantor acknowledges that but for
the truth and accuracy of the matters covered by the following representations and warranties, the Lenders would not have agreed to execute the Term Loan Amendment. 
  

 10 

 (a) Guarantor is a Delaware limited liability company duly organized pursuant to its certificate of
formation filed with the Delaware Secretary of State, and is validly existing and in good standing under the laws of Delaware. Guarantor (i) has all requisite power to own its property and conduct its business as now conducted and as presently
contemplated, and (ii) is in good standing and is duly authorized to do business in the jurisdiction of its organization and in each other jurisdiction where a failure to be so qualified in such other jurisdiction has had or could reasonably be
expected to have a Material Adverse Effect. 
 (b) Guarantor maintains an office at the address set forth for such party in
Section 13. 
 (c) Any and all balance sheets, net worth statements, and other financial data with respect to Guarantor which
have heretofore been given to the Credit Parties by or on behalf of Guarantor fairly and accurately present the financial condition of Guarantor as of the respective dates thereof. 
 (d) The execution, delivery, and performance by Guarantor of this Guaranty does not and will not contravene or conflict with (i) any Laws, order,
rule, regulation, writ, injunction or decree now in effect of any Government Authority, or court having jurisdiction over Guarantor, (ii) any contractual restriction binding on or affecting Guarantor or Guarantor’s property or assets which
may adversely affect Guarantor’s ability to fulfill its obligations under this Guaranty, (iii) the instruments creating any trust holding title to any assets included in Guarantor’s financial statements, or (iv) the
organizational or other documents of Guarantor. 
 (e) This Guaranty creates legal, valid, and binding obligations of Guarantor enforceable
in accordance with its terms. 
 (f) Except as disclosed in writing to the Credit Parties, there is no action, proceeding, or investigation
pending or, to the knowledge of Guarantor, threatened or affecting any Guarantor, which may adversely affect such Guarantor’s ability to fulfill its obligations under this Guaranty. There are no judgments or orders for the payment of money
rendered against Guarantor for an amount in excess of $1,000,000 which have been undischarged for a period of ten (10) or more consecutive days and the enforcement of which is not stayed by reason of a pending appeal or otherwise. Guarantor is
not in default under any agreements which may materially adversely affect such Guarantor’s ability to fulfill its obligations under this Guaranty. 
 (g) All statements set forth in the Recitals are true and correct. 
 (h) Guarantor hereby makes to the
Credit Parties the representations and warranties set forth in the Credit Agreement applicable to it, as if it were a party thereto, including, without limitation, those contained in the following sections: Sections 6.1(c) and (d), 6.2 6.6, 6.7,
6.8, 6.9, 6.10, 6.12, 6.14, 6.15, 6.16, 6.17, 6.18, 6.19, 6.20, 6.23, 6.25, 6.26, 6.27, 6.28, 6.29 and 6.31. 
 All of the foregoing
representations and warranties shall be deemed remade on the date of the first disbursement of Loan proceeds, on the date of each advance of Loan proceeds, and upon any extension of the Loan pursuant to the Credit Agreement. Guarantor hereby agrees
to indemnify and hold the Credit Parties free and harmless from and against all loss, cost, liability, 

  

 11 

 
damage, and expense, including attorney’s fees and costs, which the Credit Parties may sustain by reason of the inaccuracy or breach of any of the
foregoing representations and warranties as of the date the foregoing representations and warranties are made and are remade. 
 15.
Guarantor shall deliver or cause to be delivered to the Credit Parties all of the Guarantor’s financial statements to be delivered in accordance with the terms of the Credit Agreement. 
 16. This Guaranty shall be binding upon the successors and assigns of Guarantor and shall not be discharged in whole or in part by the death or the
dissolution of any principal in Guarantor. Guarantor may not assign or transfer any of its rights or obligations under this Guaranty without the prior written consent of the Credit Parties. The liability of Guarantor and Parent Guarantor as
guarantors of the Loan shall be joint and several. 
 17. THIS GUARANTY, THE NOTES, AND ALL OTHER INSTRUMENTS EVIDENCING AND
SECURING THE LOAN SECURED HEREBY WERE DELIVERED BY GUARANTOR AND ACCEPTED BY AGENT IN THE COMMONWEALTH OF VIRGINIA, WHICH STATE THE PARTIES AGREE HAS A SUBSTANTIAL RELATIONSHIP TO THE PARTIES AND THE UNDERLYING TRANSACTIONS EMBODIED HEREBY. IN ALL
RESPECTS, INCLUDING, WITHOUT LIMITATION, PERFORMANCE OF THIS GUARANTY AND THE OBLIGATIONS ARISING HEREUNDER, THIS GUARANTY SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE COMMONWEALTH OF VIRGINIA APPLICABLE TO
CONTRACTS MADE AND TO BE PERFORMED IN SUCH STATE AND ANY APPLICABLE LAWS OF THE UNITED STATES OF AMERICA. 
 18. Lenders shall be
entitled to honor any request for Loan proceeds made by Borrower and shall have no obligation to see to the proper disposition of such advances. Guarantor agrees that their respective obligations hereunder shall not be released or affected by reason
of any improper disposition by Borrower of such Loan proceeds. 
 19. In the event of the business failure of Guarantor or if there shall be
pending any bankruptcy or insolvency case or proceeding with respect to Guarantor under federal bankruptcy law or any other applicable law or in connection with the insolvency of Guarantor, or if a liquidator, receiver, or trustee shall have been
appointed for Guarantor or Guarantor’s properties or assets, the Credit Parties may file such proofs of claim and other papers or documents as may be necessary or advisable in order to have the claims of the Credit Parties allowed in any
proceedings relative to Guarantor, or any of Guarantor’s properties or assets, and, irrespective of whether the indebtedness or other obligations of Borrower guaranteed hereby shall then be due and payable, by declaration or otherwise, the
Credit Parties shall be entitled and empowered to file and prove a claim for the whole amount of any sums or sums owing with respect to the indebtedness or other obligations of Borrower guaranteed hereby, and to collect and receive any moneys or
other property payable or deliverable on any such claim. Guarantor covenants and agrees that upon the commencement of a voluntary or involuntary bankruptcy proceeding by or against Borrower, Guarantor shall not seek a supplemental stay or otherwise
pursuant to 11 U.S.C. §105 or any other provision of the United States Bankruptcy Code, as amended, or any other debtor relief law (whether statutory, common law, case law, or otherwise) of any 

  

 12 

 
jurisdiction whatsoever, now or hereafter in effect, which may be or become applicable, to stay, interdict, condition, reduce or inhibit the ability of the
Credit Parties to enforce any rights of the Credit Parties against Guarantor by virtue of this Guaranty or otherwise. 
 20. Guarantor agrees
that in addition to disclosures made in accordance with standard banking practices, any Credit Party may disclose information obtained by such Credit Party pursuant to this Guaranty to assignees or participants and potential assignees or
participants hereunder subject to the terms of the Credit Agreement. 
 21. This Guaranty may be executed in any number of counterparts and
by different parties hereto in separate counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall constitute one and the same instrument. 
 22. [Intentionally Omitted.] 
 23. The
Guarantor covenants and agrees that so long as any Loan or Note is outstanding that Guarantor shall comply with all of the covenants and agreements set forth in the Credit Agreement applicable to it, as if it were a party thereto, including, without
limitation, those contained in the following sections: Sections 7.2, 7.3, 7.4(e)(i) and (iii), 7.5(a), (b), (c) and (d), 7.6, 7.7, 7.8, 7.9, 7.10, 7.11, 7.12, 7.14, 7.15, 7.19, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.11, 8.13, 8.14, 8.16, 15,
16, 18.8, 21, 25 and 33. 
 24. This Guaranty shall, subject to the terms of Section 5 hereof, continue in effect until all of the
Guaranteed Obligations and all of the obligations of Guarantor to Lender under this Guaranty are fully and finally paid, performed and discharged in accordance with their terms (and without regard to any extension, reduction or other alteration
thereof in any proceeding under the Bankruptcy Code or any other proceeding described in Section 12.1(h), (i) or (j) of the Credit Agreement) and are not subject to any bankruptcy preference period or any other disgorgement, and the
obligation of the Lenders to make disbursements of the Loan under the Credit Agreement shall have terminated. 
 25. Capitalized terms used
herein and not otherwise defined herein shall have the meaning given such terms in the Credit Agreement. 
 26. Exculpation.
Notwithstanding anything in the Loan Documents to the contrary, but subject to the qualifications hereinbelow set forth, the Agent for itself and the Lenders, agrees that (i) the Guarantor shall be liable upon the indebtedness evidenced by the
Notes and the other Guaranteed Obligations evidenced by the Loan Documents to the full extent (but only to the extent) of the security provided by Guarantor, the same being all properties (whether real or personal), rights, estates and interests
described in the CH1 Mortgage and the CH1 Assignment of Leases and Rents now or at any time hereafter securing the payment of the Notes and/or the other Guaranteed Obligations (collectively, the “Security Property”), (ii) if an Event
of Default occurs, any judicial proceedings brought by any of the Credit Parties against the Guarantor shall be limited to the preservation, enforcement and foreclosure, or any thereof, of the liens, security titles, estates, assignments, rights and
security interests in the CH1 Mortgage and the CH1 Assignment of Leases and Rents, and confirmation of any sale under power of sale, and no attachment, execution or other writ of process shall be sought, issued or levied upon any assets, properties
or funds of the Guarantor or its members other than the Security Property except with 

  

 13 

 
respect to the liability described below in this section, and (iii) in the event of a foreclosure of such liens, security titles, estates, assignments,
rights or security interests securing the payment of the Notes and/or the other Guaranteed Obligations, whether by judicial proceedings or exercise of power of sale, no judgment for any deficiency upon the indebtedness evidenced hereby shall be
sought or obtained by any of the Credit Parties against the Guarantor, except with respect to the liability described below in this section; provided, however, that, notwithstanding the foregoing provisions of this section, the Guarantor shall be
fully and personally liable and subject to legal action as follows: 
 (a) Upon the occurrence of any event described in Paragraph 1(a) of
that certain Indemnity and Guaranty Agreement dated as of the date hereof made by Parent Guarantor in favor of the Credit Parties (as the same may be modified or amended from time to time, the “CH1 Indemnity and Guaranty Agreement”), which
triggers any recourse to or liability of Parent Guarantor. 
 (b) Notwithstanding anything to the contrary in the Notes or any of the other
Loan Documents, (X) the Credit Parties shall not be deemed to have waived any right which such Persons may have under Section 506(a), 506(b), 1111(b) or any other provisions of the U.S. Bankruptcy Code to file a claim for the full
amount of the indebtedness evidenced by the Notes and the other Guaranteed Obligations evidenced by the Loan Documents or to require that all collateral shall continue to secure all of such indebtedness and obligations, and (Y) all such
indebtedness evidenced by the Notes and the other Guaranteed Obligations evidenced by the Loan Documents shall be deemed fully recourse to the Guarantor upon the occurrence of any event described in Paragraph 1(b) of the CH1 Indemnity and Guaranty
Agreement, which triggers any recourse to or liability of Parent Guarantor. 
 Nothing contained in this Section 26 shall (1) be
deemed to be a release or impairment of the indebtedness evidenced by the Notes or the other Guaranteed Obligations evidenced by the Loan Documents or the lien of the Loan Documents upon the Security Property or any other Collateral, or
(2) preclude the Agent from foreclosing under the Loan Documents in case of any Event of Default or from enforcing any of the other rights of the Agent except as stated in this section, or (3) limit or impair in any way whatsoever the
Guaranty given by Parent Guarantor for the benefit of the Credit Parties dated as of October 24, 2008 (the “Parent Guarantor Guaranty”), the Indemnity Agreement, the Indemnity and Guaranty Agreement or the Notes or release, relieve,
reduce, waive or impair in any way whatsoever, any obligation of any party to such Notes, Parent Guarantor Guaranty, Indemnity Agreement, or Indemnity and Guaranty Agreement. 
 [SIGNATURES ON NEXT PAGE] 
  

 14 

 IN WITNESS WHEREOF, Guarantor has delivered this Guaranty as of the date first written above. 

 

									
	GUARANTOR:
	
	TARANTULA VENTURES LLC, a Delaware limited
liability company
		
	By:	 	Tarantula Interests LLC, a Delaware limited liability
company, its Managing Member
			
		 	By:	 	Safari Ventures LLC, a Delaware limited
liability company, its Managing Member
				
		 		 	By:	 	DuPont Fabros Technology, Inc., a
Maryland corporation, its Managing
Member
					
		 		 		 	By:	 	 /s/ Richard A. Montfort

		 		 		 	Name:	 	 Richard A. Montfort

		 		 		 	Title:	 	 General Counsel and Secretary

	
	(SEAL)

  

 15 

 IN WITNESS WHEREOF, Agent joins in the execution of this Guaranty solely for the purpose of acknowledging
and agreeing to the provisions of Section 26 hereof. 
  

			
	AGENT:
	
	 KEYBANK NATIONAL ASSOCIATION,

	 as Agent

		
	 By:
	 	 /s/ John Scott

	 Name:
	 	 John Scott

	 Title:
	 	 Vice President

  

 16

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