Document:

EX-10.12

JOINDER AGREEMENT

THIS JOINDER AGREEMENT dated as of September 10, 2007, executed and delivered by NNN
HEALTHCARE/OFFICE REIT QUEST DIAGNOSTICS, LLC, a Delaware limited liability company (the “New
Subsidiary”), in favor of LASALLE BANK NATIONAL ASSOCIATION, in its capacity as Agent (the “Agent”)
for the Banks under that certain Loan Agreement dated as of September 10, 2007 (as amended,
restated, supplemented or otherwise modified from time to time, the “Loan Agreement”), by and among
NNN HEALTHCARE/OFFICE REIT HOLDINGS, L.P., a Delaware limited partnership (the “Borrower”), the
financial institutions party thereto and their assignees under Section 1 thereof (the “Banks”) and
the Agent.

WHEREAS, pursuant to the Loan Agreement, the Banks have agreed to make available to the
Borrower certain financial accommodations on the terms and conditions set forth in the Loan
Agreement;

WHEREAS, Borrower owns, directly or indirectly, at least a majority of the issued and
outstanding Equity Interests in the New Subsidiary;

WHEREAS, the Borrower, the New Subsidiary, and the existing Guarantors, though separate legal
entities, are mutually dependent upon each other in the conduct of their respective businesses as
an integrated operation and have determined it to be in their mutual best interests to obtain
financing from the Banks through their collective efforts;

WHEREAS, the New Subsidiary acknowledges that it will receive direct and indirect benefits
from the Banks making such financial accommodations available to the Borrower under the Loan
Agreement and, accordingly, the New Subsidiary is willing to guarantee the Borrower’s obligations
to the Banks on the terms and conditions contained herein; and

WHEREAS, the New Subsidiary’s execution and delivery of this Joinder Agreement is a condition
to the Banks continuing to make such financial accommodations to the Borrower.

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged by the New Subsidiary, the New Subsidiary agrees as follows:

ARTICLE 1

Joinder to Guaranty. The New Subsidiary hereby agrees that it is a “Guarantor” under that
certain Guaranty of Payment dated as of September 10, 2007 (as amended, supplemented, restated or
otherwise modified from time to time, the “Guaranty”), made by NNN HEALTHCARE OFFICE REIT, INC., a
Maryland corporation, and each other Person a party thereto in favor of the Agent and assumes all
obligations, representations, warranties, covenants, terms, conditions, duties and waivers of a
“Guarantor” thereunder, all as if the New Subsidiary had been an original signatory to the
Guaranty. Without limiting the generality of the foregoing, the New Subsidiary hereby:

1.1 irrevocably and unconditionally guarantees the due and punctual payment and performance
when due, whether at stated maturity, by acceleration or otherwise, of all Obligations (as defined
in the Guaranty);

1.2 makes to the Banks as of the date hereof each of the representations and warranties
contained in Section 2 of the Guaranty and agrees to be bound by each of the covenants contained in
the Guaranty; and

1.3 consents and agrees to each provision set forth in the Guaranty.

ARTICLE 2

Intentionally Omitted.

ARTICLE 3

Intentionally Omitted.

ARTICLE 4

GOVERNING LAW. THIS JOINDER AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED AND ENFORCED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF ILLINOIS APPLICABLE TO CONTRACTS EXECUTED, AND TO BE
FULLY PERFORMED, IN SUCH STATE.

Further Assurances. The New Subsidiary agrees to execute and deliver such other
instruments and documents and take such other action, as the Agent may reasonably request, in
connection with the transactions contemplated by this Joinder Agreement.

Definitions. Capitalized terms used herein and not otherwise defined herein shall have
their respective defined meanings given them in the Loan Agreement.

(Signatures on next Page)

1

IN WITNESS WHEREOF, the New Subsidiary has caused this Joinder Agreement to be duly executed
and delivered under seal by its duly authorized officers as of the date first written above.

	 
	NNN HEALTHCARE/OFFICE REIT QUEST DIAGNOSTICS, LLC, a Delaware limited liability

company

By: NNN Healthcare/Office REIT Holdings, L.P., a Delaware limited partnership,

its sole member

By: NNN Healthcare/Office REIT, Inc., a Maryland corporation, its

General Partner

By: /s/ Andrea R. Biller

Name: Andrea R. Biller

Title: Executive Vice President

	 	 	[SEAL]

Address for Notices:

NNN Healthcare/Office REIT LP

c/o Triple Net Properties, LLC

1551 North Tustin Avenue

Suite 200

Santa Ana, California 92705

Attention: Andrea Biller, Esq.

Accepted:

LASALLE BANK NATIONAL

ASSOCIATION, as Agent

By: /s/ A. Brad Feine

Name: A. Brad Feine

Title: VP

2EX-10.13

JOINDER AGREEMENT

THIS JOINDER AGREEMENT dated as of September 10, 2007, executed and delivered by NNN
HEALTHCARE/OFFICE REIT TRIUMPH, LLC, a Delaware limited liability company (the “New Subsidiary”),
in favor of LASALLE BANK NATIONAL ASSOCIATION, in its capacity as Agent (the “Agent”) for the Banks
under that certain Loan Agreement dated as of September 10, 2007 (as amended, restated,
supplemented or otherwise modified from time to time, the “Loan Agreement”), by and among NNN
HEALTHCARE/OFFICE REIT HOLDINGS, L.P., a Delaware limited partnership (the “Borrower”), the
financial institutions party thereto and their assignees under Section 1 thereof (the “Banks”) and
the Agent.

WHEREAS, pursuant to the Loan Agreement, the Banks have agreed to make available to the
Borrower certain financial accommodations on the terms and conditions set forth in the Loan
Agreement;

WHEREAS, Borrower owns, directly or indirectly, at least a majority of the issued and
outstanding Equity Interests in the New Subsidiary;

WHEREAS, the Borrower, the New Subsidiary, and the existing Guarantors, though separate legal
entities, are mutually dependent upon each other in the conduct of their respective businesses as
an integrated operation and have determined it to be in their mutual best interests to obtain
financing from the Banks through their collective efforts;

WHEREAS, the New Subsidiary acknowledges that it will receive direct and indirect benefits
from the Banks making such financial accommodations available to the Borrower under the Loan
Agreement and, accordingly, the New Subsidiary is willing to guarantee the Borrower’s obligations
to the Banks on the terms and conditions contained herein; and

WHEREAS, the New Subsidiary’s execution and delivery of this Joinder Agreement is a condition
to the Banks continuing to make such financial accommodations to the Borrower.

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged by the New Subsidiary, the New Subsidiary agrees as follows:

ARTICLE 1

1.1 Joinder to Guaranty. The New Subsidiary hereby agrees that it is a “Guarantor”
under that certain Guaranty of Payment dated as of September 10, 2007 (as amended, supplemented,
restated or otherwise modified from time to time, the “Guaranty”), made by NNN HEALTHCARE OFFICE
REIT, INC., a Maryland corporation, and each other Person a party thereto in favor of the Agent and
assumes all obligations, representations, warranties, covenants, terms, conditions, duties and
waivers of a “Guarantor” thereunder, all as if the New Subsidiary had been an original signatory to
the Guaranty. Without limiting the generality of the foregoing, the New Subsidiary hereby:

1.1.1 irrevocably and unconditionally guarantees the due and punctual payment and performance
when due, whether at stated maturity, by acceleration or otherwise, of all Obligations (as defined
in the Guaranty);

1.1.2 makes to the Banks as of the date hereof each of the representations and warranties
contained in Section 2 of the Guaranty and agrees to be bound by each of the covenants contained in
the Guaranty; and

1.1.3 consents and agrees to each provision set forth in the Guaranty.

ARTICLE 2

Intentionally Omitted.

ARTICLE 3

Intentionally Omitted.

ARTICLE 4

4.1 GOVERNING LAW. THIS JOINDER AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED AND
ENFORCED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF ILLINOIS APPLICABLE TO CONTRACTS EXECUTED,
AND TO BE FULLY PERFORMED, IN SUCH STATE.

4.2 Further Assurances. The New Subsidiary agrees to execute and deliver such other
instruments and documents and take such other action, as the Agent may reasonably request, in
connection with the transactions contemplated by this Joinder Agreement.

4.3 Definitions. Capitalized terms used herein and not otherwise defined herein shall
have their respective defined meanings given them in the Loan Agreement.

(Signatures on next Page)

1

IN WITNESS WHEREOF, the New Subsidiary has caused this Joinder Agreement to be duly
executed and delivered under seal by its duly authorized officers as of the date first written
above.

	 
	NNN HEALTHCARE/OFFICE REIT TRIUMPH, LLC, a Delaware limited liability company

By: NNN Healthcare/Office REIT Holdings, L.P., a Delaware limited partnership,

its sole member

By: NNN Healthcare/Office REIT, Inc., a Maryland corporation, its

General Partner

By: /s/ Andrea R. Biller

Name: Andrea R. Biller

Title: Executive Vice President

	 	 	[SEAL]

Address for Notices:

NNN Healthcare/Office REIT LP

c/o Triple Net Properties, LLC

1551 North Tustin Avenue

Suite 200

Santa Ana, California 92705

Attention: Andrea Biller, Esq.

Accepted:

LASALLE BANK NATIONAL

ASSOCIATION, as Agent

By: /s/ A. Brad Feine

Name: A. Brad Feine

Title: VP

2Filed by Bowne Pure Compliance

 

EXHIBIT
10.1

Ludwig Kuttner

May 15, 2006

Page 2

Exhibit A

	 	1)	 	Title — Vice President of Business Development, General Counsel and Assistant
Secretary
	 
	 	2)	 	Base Salary — For the period March 1, 2006 through December 31, 2006, base
compensation shall be payable at a rate of $195,000 (Golden will be paid the shortfall
between his total compensation received to date and the total compensation he is otherwise
entitled to receive hereunder for the period March 1, 2006 and the date hereof no later
than June 23, 2006). Base salary shall increase to $230,000 for the period January 1, 2007
through December 31, 2007. Increases for 2008 and beyond shall be as determined by
Hampshire in accordance with its customary compensation practices.
	 
	 	3)	 	Annual Bonus — Shall consist of three components: (i) 25% of that year’s Base
Salary (for purposes of this Section 3, the 2006 Base Salary for the entire year shall be
considered to be $195,000), 50% of which shall be pre-paid on a monthly basis subject to
Hampshire’s customary payroll practices and the remaining 50% of which shall be paid
one-half prior to December 31 of each year and one-half upon completion of the audit for
that given year (approximately March 31 of the following year); (ii) up to an additional 5%
of that year’s Base Salary payable in the discretion of management based on performance,
which shall be paid upon completion of the audit for that given year; and (iii) an amount
equal to 2% of Hampshire Group, Limited’s net income for that year above a floor of $10
million (excluding any extraordinary charges), which shall be paid one-half prior to
December 31 of each year and one-half upon completion of the audit for that given year.
	 
	 	4)	 	Equity Incentive — In the event Hampshire adopts an equity incentive program,
awards shall be granted to Golden at a level comparable to those received by other members
of the senior management team.
	 
	 	5)	 	Benefits — Golden shall participate in all benefit programs (e.g., health,
life and disability insurance and 401(k)) at a level comparable to that of other members of
the senior management team. In addition, Hampshire shall pay the then effective COBRA
rates to continue Golden’s current family coverage (net of any Hampshire employee
contribution amount) until the later of (x) December 31, 2006 and (y) there is an open
enrollment period for the Hampshire health insurance plan.
	 
	 	6)	 	Termination — In the event Hampshire terminates Golden’s employment for
anything other than good cause, Golden shall be paid a termination payment equal to six
months Base Salary and six months pro rata portion of the estimated Annual Bonus for that
year (payable in accordance with Hampshire’s customary payroll practices). For purposes of
this Agreement, “good cause” shall have the same meaning as ascribed to such phrase in the
employment agreement of Hampshire’s Chief Executive Officer dated January 1, 2005. In the
event Golden determines to terminate his employment with Hampshire, he shall be obligated
to provide Hampshire with three months prior notice.
	 
	 	7)	 	Continuing Education — Hampshire shall pay for (i) all fees and expenses
incurred in keeping Golden’s bar admissions current (including both state licensing and
continuing education requirements) and (ii) up to two finance-related courses.

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