Document:

exv10w6

     Exhibit 10.6

SECOND AMENDMENT TO LEASE AGREEMENT

     THIS SECOND AMENDMENT TO LEASE AGREEMENT (this “Second Amendment”) is entered into as
of this 26th day of June, 2008 (the “Execution Date”), by and between BMR-9920
BELWARD CAMPUS Q LLC, a Rhode Island limited liability company (“Landlord,” f.k.a. GP Rock
One, L.L.C.), and NOVAVAX, INC., a Delaware corporation (“Tenant”).

RECITALS

     A. WHEREAS, Landlord and Tenant entered into that certain Lease Agreement dated as of May 7,
2007, as amended by that certain First Amendment to Lease (the “First Amendment”) dated as
of May 30, 2008 (as the same may have been amended, supplemented or otherwise modified from time
to time, collectively, the “Lease”), whereby Tenant leases certain premises (the
“Premises”) from Landlord at 9920 Belward Campus Drive in Rockville, Maryland (the
“Building”);

     B. WHEREAS, Tenant has performed certain Alterations to the Premises;

     C. WHEREAS, Landlord and Tenant desire to modify the Lease Term; and

     D. WHEREAS, Landlord and Tenant desire to modify and amend the Lease only in the respects and
on the conditions hereinafter stated.

AGREEMENT

     NOW, THEREFORE, Landlord and Tenant, in consideration of the mutual promises contained
herein and for other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, and intending to be legally bound, agree as follows:

     1. Definitions. For purposes of this Second Amendment, capitalized terms shall
have
the meanings ascribed to them in the Lease unless otherwise defined herein.

     2. Lease Term. Section 2 of the First Amendment is hereby deleted in its
entirety. The parties hereby agree that the Lease Term commenced on January 1, 2007 and, unless
earlier terminated, the Lease Term shall expire on January 31, 2017. The period from June 27,
2008 through January 31, 2017, is referred to herein as the “Remaining Term.”

     3. Rent. Base Rent for the Remaining Term, calculated in accordance with Section
5 of this Second Amendment, shall increase in accordance with Section 2.C of the
Lease.

     4. Allowance for Alterations. Section 3 of the First Amendment is hereby
deleted in its entirety and replaced with the following:

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          a. Landlord shall reimburse Tenant for up to Three Million Dollars ($3,000,000) (the
“Allowance”) for Tenant’s construction of Alterations, to the extent completed in
conformity with the Lease, Tenant’s permitted use and applicable laws. The Allowance may be
applied to the costs of (i) construction and installation of HVAC, (ii) space planning,
architect, engineering and other related services performed by third parties unaffiliated with
Tenant, (iii) building permits and
other taxes, fees, charges and levies by governmental authorities for permits or for inspections of
the Alterations, and (iv) costs and expenses for labor, material, equipment and fixtures. In no
event shall the Allowance be used for (v) the cost of work that is not authorized by plans approved
in writing by Landlord, (w) payments to Tenant or any affiliates of Tenant, (x) the purchase of any
furniture, personal property or other non-building system equipment, (y) costs resulting from any
default by Tenant of its obligations under the Lease or (z) costs that are recoverable by Tenant
from a third party (e.g., insurers, warrantors, or tortfeasors). Landlord acknowledges that it has
reviewed and approved the following construction documents: interior renovation drawings prepared
by Jacobs Engineering dated August 24, 2007, consisting of fifteen (15) drawing sheets.

          b. Provided Tenant delivers the following documentation to Landlord by June 26,
2008, the entire amount of the Allowance shall be paid to Tenant on June 27, 2008:

	 	(i)	 	a statement (an “Advance Request”)
requesting the total amount of the Allowance be disbursed to Tenant;
	 
	 	(ii)	 	a summary of the Alterations performed using
AIA standard form Application for Payment (G 702) executed by the general
contractor;
	 
	 	(iii)	 	lien releases from the general contractor and
each subcontractor and material supplier with respect to the Alterations
performed that correspond to the Advance Request;
	 
	 	(iv)	 	a certificate of occupancy for the Premises
suitable for the permitted use;
	 
	 	(v)	 	and a Certificate of Substantial Completion in the
form of the American Institute of Architects document G704, executed by
the project architect and the general contractor.

     5. Base Rent. Commencing on June 27, 2008, each monthly installment of Base Rent
shall be increased to include an amount equal to the monthly payment necessary to amortize the
entire amount of the Allowance over the Remaining Term, at a rate of eleven percent (11%).
Commencing on July 1, 2008, and on each subsequent day on which Base Rent is due during the
Remaining Term, Tenant shall pay the Base Rent amount as adjusted pursuant to this Section 5, which amount shall be further adjusted in accordance with Section 2.C of the Lease.
Furthermore, on July 1, 2008, Tenant shall pay the underpayment of the adjusted Base Rent for the
period from June 27, 2008-June 30, 2008.

     6. Condition of Premises. Tenant acknowledges that (a) it is in possession of and is
fully familiar with the condition of the Premises and, notwithstanding anything contained in the
Lease or this Second Amendment to the contrary, agrees to take the same in its condition “as is”
as of the Execution Date, and (b) Landlord shall have no obligation to alter, repair or otherwise
prepare
the Premises for Tenant’s continued occupancy or to pay for any improvements to the Premises,
except for the Allowance.

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     7. Broker. Tenant represents and warrants that it has not dealt with any broker or
agent in the negotiation for or the obtaining of this Second Amendment and agrees to indemnify,
defend and hold Landlord harmless from any and all cost or liability for compensation claimed by
any such broker or agent employed or engaged by it or claiming to have been employed or engaged by
it.

     8. No Default. Each party represents, warrants and covenants that, to the best of its
knowledge, neither Landlord nor Tenant is in default of any of its respective obligations under the
Lease and no event has occurred that, with the passage of time or the giving of notice (or both)
would constitute a default by either Landlord or Tenant thereunder.

     9. Effect of Second Amendment. Except as modified by this Second Amendment, the Lease
and all the covenants, agreements, terms, provisions and conditions thereof shall remain in full
force and effect and are hereby ratified and affirmed. The covenants, agreements, terms, provisions
and conditions contained in this Second Amendment shall bind and inure to the benefit of the
parties hereto and their respective successors and, except as otherwise provided in the Lease,
their respective assigns. In the event of any conflict between the terms contained in this Second
Amendment and the Lease, the terms herein contained shall supersede and control the obligations and
liabilities of the parties. From and after the Execution Date, the term “Lease” as used in the
Lease shall mean the Lease, as modified by this Second Amendment.

     10. Miscellaneous. This Second Amendment becomes effective only upon execution and
delivery hereof by Landlord and Tenant. The captions of the paragraphs and subparagraphs in this
Second Amendment are inserted and included solely for convenience and shall not be considered or
given any effect in construing the provisions hereof. All exhibits hereto are incorporated herein
by reference.

     11. Counterparts. This Second Amendment may be executed in one or more counterparts
that, when taken together, shall constitute one original.

[REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

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     IN WITNESS WHEREOF, Landlord and Tenant have hereunto set their hands as of the date and year
first above written, and acknowledge that they possess the requisite authority to enter into this
transaction and to execute this Second Amendment.

	 	 	 	 	 
	LANDLORD:

BMR-9920 BELWARD CAMPUS Q LLC, 
a Rhode
Island limited liability company

 	 	 
	By:  	/s/ Gary A. Kreitzer
 	 	 
	 	Name:  	Gary A. Kreitzer 	 	 
	 	Title:  	Executive V.P. 	 	 
	 

	 	 	 	 	 
	TENANT:

NOVAVAX, INC.,

a Delaware corporation

 	 
	By:  	/s/ L. Stigliano
 	 	 
	 	Name:  	L. Stigliano 	 	 
	 	Title:  	VP, CFOexv10w55

Exhibit 10.55

ELEVENTH LOAN MODIFICATION AGREEMENT

     This Eleventh Loan Modification Agreement (this “Loan Modification Agreement”) is entered into
as of the Eleventh Loan Modification Effective Date, by and between SILICON VALLEY BANK, a
California corporation, with its principal place of business at 3003 Tasman Drive, Santa Clara,
California 95054 and with a loan production office located at 380 Interlocken Crescent, Suite 600
Broomfield, Colorado 80021 (“Bank”) and DOUBLE-TAKE SOFTWARE, INC., f/k/a NSI SOFTWARE, INC.,
successor by merger with NETWORK SPECIALISTS, INCORPORATED, a Delaware corporation with offices at
Two Hudson Place, Suite 700, Hoboken, New Jersey 07030 (“Borrower”).

1. DESCRIPTION OF EXISTING INDEBTEDNESS AND OBLIGATIONS. Among other indebtedness and
obligations which may be owing by Borrower to Bank, Borrower is indebted to Bank pursuant to a loan
arrangement dated as of October 16,2003, evidenced by, among other documents, a certain Loan and Security
Agreement dated as of October 16, 2003 between Borrower and Bank, (as amended, the “Loan Agreement”). Capitalized
terms used but not otherwise defined herein shall have the same meaning as in the Loan Agreement.

2. DESCRIPTION OF COLLATERAL, Repayment of the Obligations is secured by the
Collateral as described in the Loan Agreement (together with any other collateral security granted to Bank,
the “Security Documents”).

Hereinafter, the Security Documents, together with all other documents evidencing or securing the
Obligations shall be referred to as the “Existing Loan Documents”.

3. DESCRIPTION OF CHANGE IN TERMS.

          Modifications to Loan Agreement.

          A. Clause (i) of Section 5.4 of the Loan Agreement entitled “Negative Covenants” is hereby
amended by deleting the following text therefrom:

“(i) merge or consolidate with another corporation or entity
other than the Reincorporation;”

          and substituting the following in lieu thereof:

“(i) merge or consolidate with another corporation or entity other than the
Reincorporation or a Permitted Acquisition;”

          B. Section 8 of the Loan Agreement is hereby amended by inserting the following
definitions in their proper alphabetical order thereof:

“Eleventh Loan Modification Agreement” is that certain Eleventh
Loan Modification Effective Date, dated as of the Eleventh Loan Modification
Effective Date, by and between borrower and Silicon.

“Eleventh Loan Modification Effective Date” is the date
indicated on the signature page to the Eleventh Loan Modification
Agreement.

“Permitted Acquisition” means, at any time after the Eleventh Loan
Modification Date, (a) the purchase of one hundred percent of the capital
stock or other equity interests of any other Person (b) the purchase or
other acquisition of all or substantially all of the assets or properties
of, another Person or of any business unit of another Person, (c) any merger
or consolidation of such Person with any other Person or other transaction
or

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series of transactions resulting in the acquisition of all or substantially
all of the assets, or one hundred percent of the capital stock or other
equity interests, of any Person in which all of the following conditions are
satisfied:

(i) immediately prior to and after giving effect to any such Permitted
Acquisition, no Default or Event of Default shall have occurred and remain
uncured;

(ii) after giving effect to such Permitted Acquisition, if such Permitted
Acquisition is an acquisition of capital stock or equity interests, the
Borrower shall acquire and own, directly or indirectly, one hundred percent
of the capital stock or other equity interests and shall otherwise control
the governance of the Person being acquired;

(iii) any assets acquired shall be utilized in, and if the Permitted
Acquisition involves a merger, consolidation or stock acquisition, the
Person which is the subject of such Permitted Acquisition shall be engaged
in, a business otherwise permitted to be engaged in by the Borrower under
this Agreement;

(iv) if the Person which is the subject of such Permitted Acquisition will
be maintained as a subsidiary of the Borrower, such subsidiary shall have
been joined as a “Borrower” hereunder or shall otherwise execute any and
all documents and instruments (pursuant to Section 5.7 hereof), as Silicon
shall deem necessary, and Silicon shall have received (A) a first priority
security interest in each such subsidiary’s assets and other property of
the same nature as constitutes Collateral pursuant to Section 2.1 and (ii)
a pledge by Borrower of all capital stock or other equity interests of each
such subsidiary; and

(v) the Borrower shall be either (a) the sole surviving legal entity, or
(b) the parent and owner of one hundred percent of the common stock or
other equity interests of any surviving entities that shall be subsidiaries
of the Borrower.”

     C. Section 4 of the Schedule to the Loan Agreement is hereby amended by deleting
same in its entirety and substituting the following text therefor:

          “4. Maturity Date

          (Section 6.1)       April 29, 2009.”

4. FEES. Borrower shall reimburse Bank for all legal fees and expenses incurred in
connection with this
amendment to the Existing Loan Documents.

5. RATIFICATION OF PERFECTION CERTIFICATE. Borrower hereby ratifies, confirms, and
reaffirms,
all and singular, the terms and disclosures contained in a certain Perfection Certificate delivered
to the Bank on or
about October 16, 2003, and acknowledges, confirms and agrees the disclosures and information
provided therein
has not changed, as of the date hereof.

6. CONSISTENT CHANGES. The Existing Loan Documents are hereby amended wherever necessary to
reflect the changes described above.

7. RATIFICATION OF LOAN DOCUMENTS. Borrower hereby ratifies, confirms, and reaffirms all
terms
and conditions of all security or other collateral granted to the Bank, and confirms that the
indebtedness secured
thereby includes, without limitation, the Obligations.

8. NO DEFENSES OF BORROWER. Borrower hereby acknowledges and agrees that Borrower has no
offsets, defenses, claims, or counterclaims against the Bank with respect to the Obligations, or
otherwise, and that if

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Borrower now has, or ever did have, any offsets, defenses, claims, or counterclaims against
the Bank, whether known or unknown, at law or in equity, all of them are hereby expressly
WAIVED and Borrower hereby RELEASES the Bank from any liability thereunder.

9, CONTINUING VALIDITY. Borrower understands and agrees that in modifying the existing
Obligations,
Bank is relying upon Borrower’s representations, warranties, and agreements, as set forth in the
Existing Loan
Documents. Except as expressly modified pursuant to this Loan Modification Agreement, the terms of
the Existing
Loan Documents remain unchanged and in full force and effect. Bank’s agreement to modifications to
the existing
Obligations pursuant to this Loan Modification Agreement in no way shall obligate Bank to make any
future
modifications to the Obligations. Nothing in this Loan Modification Agreement shall constitute a
satisfaction of the
Obligations. It is the intention of Bank and Borrower to retain as liable parties all makers of
Existing Loan
Documents, unless the party is expressly released by Bank in writing. No maker will be released by
virtue of this
Loan Modification Agreement.

10. COUNTERSIGNATURE. This Loan Modification Agreement shall become effective only when it
shall have been executed by Borrower and Bank.

[Remainder of page intentionally left blank]

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     This Loan Modification Agreement is executed as a sealed instrument under the
laws of the Commonwealth of Massachusetts as of the Eleventh Loan Modification Effective Date,
written below.

BORROWER:

	 	 	 	 	 
	DOUBLE-TAKE SOFTWARE, f/k/a NSI SOFTWARE, INC.,

successor by merger with

NETWORK SPECIALISTS, INCORPORATED	 	 
	 	 	 	 	 
	By:
	 	/s/ S. Craig Huke	 	 
	Name:
	 	 
S.
Craig Huke	 	 
	 	 	 	 	 
	Title:
	 	Chief Financial Officer	 	 
	 	 	 	 	 
	 	 	 	 	 
	BANK:	 	 
	 	 	 	 	 
	SILICON VALLEY BANK	 	 
	 	 	 	 	 
	By:
	 	/s/ Kimberly A. Stover	 	 
	 	 	 	 	 
	Name:
	 	Kimberly A. Stover	 	 
	 	 	 	 	 
	Title:
	 	Relationship Manager	 	 
	 	 	 	 	 

Eleventh Loan Modification Effective Date: May 1, 2008

[Eleventh Loan Modification Agreement Signature Page]

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