Document:

Filed by Bowne Pure Compliance

EXHIBIT 10.81

EQUITY PURCHASE AGREEMENT

This Equity Purchase Agreement is dated as of December 31, 2007, by and between Jeffrey A.
Patterson, an individual residing in Hinsdale, Illinois (the “Executive”), and Prime Office Company
LLC, a Delaware limited liability company (the “Company”).

W I T N E S S E T H:

WHEREAS, the Executive is President and Chief Executive Officer of Prime Group Realty Trust, a
subsidiary of the Company, and the Company and Executive have entered into that certain Employment
Agreement dated as of May 31, 2005 (as amended, the “Employment Agreement”);

WHEREAS, the Company desires to grant to Executive an option to purchase from the Company the
equity interest described below, subject to the terms and conditions hereinafter set forth.

NOW, THEREFORE, for good and valuable consideration, the parties hereto agree as follows:

1. Option. The Executive will be permitted to purchase either directly or through
equity ownership in the Company up to 3.5% of the equity ownership (the “Equity”) of Prime Group
Realty, L.P. and Prime Group Realty Trust (the “Equity”) in the form of L.P. units, shares,
membership interests or similar units of the same class at a price and on substantially the same
other economic terms as Prime Office Company LLC’s other initial equity investors (the
“Investors”), taking into account both capital contributions and distributions since the date of
the original investment. In addition, the “purchase price” for the Equity as calculated pursuant
to the terms of the Employment Agreement shall be increased at the rate of seven percent (7%) per
year, pro-rated on a per diem basis, from January 1, 2007 through to the closing of the purchase of
the Equity by Executive. This option will expire at 5:00 p.m. New York time, on December 31, 2008,
subject to earlier termination if not exercised prior to Executive’s employment termination under
the Employment Agreement.

Executive shall be entitled to exercise the Option at any time through December 31, 2008, but
the closing on the purchase of the Equity may only be effective on the earlier of (i) immediately
preceding a “change of control” as defined in the Employment Agreement and (ii) December 31, 2008.
The closing shall still occur and the exercise of the Option shall be effective if Executive’s
employment is terminated in connection with or in anticipation of a “change of control” after the
exercise of the Option but prior to the closing on the purchase of the Equity. The Executive may
conditionally exercise the Option contingent on the actual closing of a “change of control”.

 

 

 

To the extent the Company is funded through additional issuances of equity, the Executive
shall be given an opportunity to purchase additional equity in an amount necessary to preserve the
Executive’s 3.5% percent of ownership. The price for such additional Equity shall be the purchase
price paid for the additional equity issuance that gave rise to the additional Equity purchase
opportunity.

The Company will provide Executive at least ten business days notice prior to any cash
distributions resulting from financing or sale transactions (as opposed to from operations) to the
Investors such that Executive shall have an opportunity to purchase Equity prior thereto and
thereby be entitled to share in any such distribution. This notice obligation shall cease once
Executive has purchased all of the Equity.

2. Purchase Loan. The Lightstone Group LLC or an affiliate thereof (“Lightstone”)
will make a loan (“Loan”) available to the Executive for his purchase of the Equity. The principal
and interest on the loan will be subject to a ten-year balloon repayment with interest accruing
annually at 7%; provided that Executive shall be required to apply the net after-tax cash proceeds
of any distributions from the Company towards payment of the Loan. The Loan shall be secured by
the Equity and non-recourse to the Executive.

The Loan may be prepaid without penalty. The Loan will accelerate and become due to the
extent of any transfer or sale of Equity by Executive other than as permitted below.

3. Transfer Restrictions. No Equity issued to the Executive may be transferred
(subject to customary exceptions for estate planning, transfers at death and transfers to an entity
controlled solely by the Executive and formed solely for the benefit of the Executive and his
immediate family), except as permitted under drag-along, tag-along or registration rights.

4. Tag-Along, Drag-Along and Registration Rights. Executive’s Equity will be subject
to customary tag-along drag-along and registration rights.

5. Termination of Restrictions. The restrictions on transfer shall terminate in the
event of an IPO or other transaction whereby the Equity becomes publicly traded, subject to any
lock-up restrictions imposed on other employee shareholders of the Company or its affiliates.

6. Miscellaneous.

(a) The validity, interpretation and effect of this Award Agreement shall be governed by the
laws of the State of Illinois, excluding the “conflicts of laws” rules thereof.

(b) Signed copies of this Agreement may be executed in counterparts and/or sent by facsimile
or email and shall be as effective and binding as original copies.

 

-2-

 

IN WITNESS WHEREOF, the parties hereto have duly executed this Award Agreement on the day and
year first above written.

	 	 	 	 	 	 	 
	 	 	PRIME OFFICE COMPANY, LLC	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	/s/ David Lichtenstein
 

	 	 
	 

	 	
	 	Name: David Lichtenstein	 	 
	 

	 	
	 	Title: President	 	 
	 
	 	 	 	 	 	 
	 	 	/s/ Jeffrey A. Patterson	 	 
	 	 	 	 	 
	 	 	Jeffrey A. Patterson	 	 

 

-3-Filed by Bowne Pure Compliance

Exhibit 10.1

FIRST AMENDMENT TO STANDARD INDUSTRIAL/COMMERCIAL MULTI-TENANT LEASE — NET

FIRST AMENDMENT (“First Amendment”) made as of June 26, 2008, to that certain Standard
Industrial/Commercial Multi-Tenant Lease — Net (“Lease”) dated for reference purposes only December
19, 2006, by and between SCIF Portfolio II, LLC, a California limited liability company (the
“Lessor”) and Chromadex, Inc., a California corporation (the “Lessee”), for that certain
approximate 7,536 square foot space (hereinafter the “Original Premises”) commonly known by the
address 10005 Muirlands Blvd., Suite G, 1st Floor, and Suite K, 92618.

I. RECITALS

Lessor and Lessee, being parties to that certain Lease and Addendum dated December 19, 2006,
hereby express their mutual desire and intent to expand the Original Premises and extend the Term
of the Lease and to otherwise amend by this writing the terms, covenants and conditions contained
in said Lease and Addendum. The terms, covenants and conditions set forth herein are intended to
and shall have the same force and effect as if set forth at length in the body of the Lease and the
Addendum. To the extent that any provisions of this Amendment are inconsistent with any provisions
of the Lease and Addendum, the provisions of this Amendment shall supersede and control.

II. AMENDMENTS

1.2a PREMISES shall hereafter additionally provide as follows:

In addition to the Original Premises, there shall be added to the Lease additional premises in
the Project (“Expansion Premises”), which Expansion Premises is that certain portion of the
Project, including all improvements therein either existing or to be provided by Lessor, commonly
known by the street address of 10005 Muirlands Blvd., Suite G, 2nd Floor, Irvine,
California, 92618, as outlined on Exhibit A attached hereto and generally described as
approximately a 5,150 square foot space, which together with the Original Premises shall constitute
the expanded Premises (“Expanded Premises”). From and after the date hereof the Expanded Premises
shall be deemed to contain a total of 12,686 square feet. For purposes of the Lease, all
references in the Lease to Premises shall be deemed to mean the Expanded Premises.

1.2b PARKING shall hereafter additionally provide as follows:

In addition to the parking allocation of twenty-two (22) unreserved parking spaces
for the Original Premises, the Expansion Premises shall be allocated sixteen (16) additional
unreserved parking spaces so that the total of unreserved parking spaces for the Expanded Premises
is thirty-eight (38) unreserved parking spaces.

1.3 TERM shall hereafter additionally provide as follows:

The Term for the Expansion Premises shall be five (5) years and zero (0) months, commencing
January 1, 2009, and terminating December 31, 2013.

The Term for the Original Premises shall be extended to be coterminous with the Term for the
Expansion Premises and shall terminate on December 31, 2013.

1.4 EARLY POSSESSION shall hereafter additionally provide as follows:

Upon the payment to Lessor by Lessee of all monies due upon the execution of this First
Amendment to Lease, and upon presentation to Lessor of a certificate of insurance for all required
Lessee insurance, Lessee may take possession of the Expansion Premises.

 

 

 

1.5 BASE RENT shall hereafter additionally provide as follows:

Lessee agrees to pay Lessor and Lessor agrees to accept $6,180.00 on a Net basis as initial
Base Rent for the Expansion Premises, payable in advance on the first day of each month during the
first year of the Term for the Expansion Premises as set forth in 1.3 above. Adjustments to the
Base Rent for the Expansion Premises and the Original Premises shall be as set forth in amendments
to Addendum Paragraph 50.1 below.

1.6 LESSEE’S SHARE OF COMMON AREA OPERATING EXPENSES
shall hereafter additionally provide as follows:

For the Expanded Premises (i.e., the Original Premises and the Expansion Premises) Lessee’s
Share of Operating Expenses shall be equal to twenty-five point zero four percent (25.04%). Such
pro-rata share shall be billed and payable in estimated monthly installments and reconciled
annually to actual expenses.

1.7c BASE RENT AND OTHER MONIES PAID UPON EXECUTION — SECURITY
DEPOSIT shall hereafter additionally provide as follows:

Upon execution of this Amendment, Lessee shall pay Lessor the sum of six thousand one hundred
eighty and 00/100ths dollars ($6,180.00) as Base Rent for the first month of Term of the Expansion
Premises and nine hundred seventy eight dollars and 50/100th dollars ($978.50) for
Lessee’s Share of Operating Expenses for the first month of the Term. Lessee shall also deposit
with Lessor the sum of six thousand one hundred eighty and 00/100th Dollars ($6,180.00),
which in addition to the $24,868.80 already on deposit with Lessor for the Original Premises, shall
constitute the entire Security Deposit for the Expanded Premises. However the Security Deposit for
the Original Premises shall continue to be reduced pursuant to Paragraph 5 of the Lease.

50.1 RENT ADJUSTMENTS — FIXED RENTAL ADJUSTMENTS shall hereafter additionally provide as follows:

The Base Rent for the Expanded Premises shall be increased to the following amounts on the
dates set forth below:

	 	 	 	 	 
	January 1, 2010 — December 31, 2010
	 	$	6,437.50	 
	January 1, 2011 — December 31, 2011
	 	$	6,695.00	 
	January 1, 2012 — December 31, 2012
	 	$	6,952.50	 
	January 1, 2013 — December 31, 2013
	 	$	7,210.00	 

Not withstanding anything contrary in the Lease, the Base Rent for the Original Premises shall
be increased to the following amounts on the dates set forth below:

	 	 	 	 	 
	April 1, 2012 — March 31, 2013
	 	$	10,173.60	 
	April 1, 2013 — December 31, 2013
	 	$	10,550.40	 

50.5 TENANT IMPROVEMENTS shall hereafter additionally provide as follows:

Lessee hereby accepts the Expansion Premises in their current “as is” condition and agrees
that Lessor shall not be required to provide any improvement work or services related to the
improvement of the Expansion Premises. Lessee shall construct Lessee’s Tenant Improvements, which
shall be deemed Alterations and shall be constructed pursuant to the terms and conditions of
Article 7.3 of the Lease and in accordance with Expansion Space Plan to be prepared by Tenant,
subject to Landlord’s reasonable approval, and thereafter inserted as Exhibit “E” to the Lease.
Lessee shall pay all costs and expenses incurred in connection with the design, permitting and
construction of Lessee’s Tenant Improvements; provided, however, Lessor shall reimburse Lessee for
up to $50,000 of the actual cost of constructing Lessee’s Tenant Improvement, which actual cost may
include soft and hard costs (“Lessor’s Allowance”), upon receipt of paid invoices for the design,
permitting and construction of Lessee’s Tenant Improvements, and mechanic lien releases reasonably
acceptable to Lessor and any other documentation reasonable requested by Lessor. All such Lessee’s
Tenant Improvement shall be completed to Lessor’s “building standard.”

 

 

 

51. OPTION TO EXTEND TERM shall hereafter additionally provide as follows:

Lessee shall have one (1) option to extend the original Term of this Lease for a five-year
(5-year) period, with all terms and conditions of the Lease continuing in force and effect during
the extended term other than the Base Monthly Rent, which shall be adjusted to then current “Fair
Market Rental,” provided, however, that the rent payable during the first month of the option and
every month thereafter shall in no event be less than the rent paid during the last month of the
initial Term. (the “Option Rent”). “Fair Market Rental” shall be equal to the rent (including
additional rent and considering any “base year” or “expense stop” if applicable thereto), including
all escalations, at which, as of the commencement of the option term, tenants are leasing
non-sublease, non-encumbered, non-equity, non-renewal, non-expansion space comparable in size,
location and quality to the Premises, for a term of five (5) years, in an arm’s length transaction,
which comparable space is located in the Project, or, if there are not at least three (5) current
comparable transactions in the Project, then in comparable buildings in Irvine, California, in
either case taking into consideration the following concessions: (a) rental abatement concessions,
if any, being granted such tenants in connection with such comparable space; (b) tenant
improvements or allowances provided or to be provided for such comparable space, taking into
account, and deducting the value of, the existing improvements in the Premises, such value to be
based upon the age, design, quality of finishes and layout of the improvements and the extent to
which the same can be utilized by Lessee based upon the fact that the precise tenant improvements
existing in the Premises are specifically suitable to Lessee; and (c) other reasonable monetary
concessions being granted such tenants in connection with such comparable space; provided, however,
that in calculating the Option Rent, no consideration shall be given to (i) the fact that Lessor is
or is not required to pay a real estate brokerage commission in connection with Lessee’s exercise
of its right to lease the Premises during the Option Term or the fact that Lessors are or are not
paying real estate brokerage commissions in connection with such comparable space, and (ii) any
period of rental abatement, if any, granted to tenants in comparable transactions in connection
with the design, permitting and construction of tenant improvements in such comparable spaces.
Lessee shall deliver written notice to Lessor of its intention to exercise such option no less 180
days, nor more than 270 days, prior to the expiration of the original Lease term. Upon Lessee’s
exercise of the option, Lessor shall deliver notice to Lessee of the Option Rent. If the Option
Rent is based on the Fair Market Rental and if Lessor and Lessee disagree on the Fair Market
Rental, and Lessor and Lessee fail to reach agreement within ten (10) business days following
Lessee’s objection to the Option Rent (the “Outside Agreement Date”), then each party shall make a
separate determination of the Option Rent within five (5) business days after the applicable
Outside Agreement Date, and such determinations shall be submitted to arbitration in accordance
with Paragraphs 50.2.1 through 5.2.7 below.

50.1.1 Lessor and Lessee shall each appoint one arbitrator who shall be a real estate broker
who shall have been active over the five (5) year period ending on the date of such appointment in
the leasing of industrial property in Commerce, California. The determination of the arbitrators
shall be limited solely to the issue of whether Lessor’s or Lessee’s submitted Option Rent is the
closest to the actual Option Rent as determined by the arbitrators, taking into account the
definition of Fair Market Rental above. Each such arbitrator shall be appointed within fifteen
(15) days after the applicable Outside Agreement Date.

50.1.2 The two (2) arbitrators so appointed shall within ten (10) days of the date of the
appointment of the last appointed arbitrator agree upon and appoint a third arbitrator who shall be
qualified under the same criteria set forth hereinabove for qualification of the initial two (2)
arbitrators.

50.1.3 The three (3) arbitrators shall within thirty (30) days of the appointment of the third
arbitrator reach a decision as to whether the parties shall use Lessor’s or Lessee’s submitted
Option Rent, and shall notify Lessor and Lessee thereof.

50.1.4 The decision of the majority of the three (3) arbitrators shall be binding upon Lessor
and Lessee.

50.1.5 If either Lessor or Lessee fails to appoint an arbitrator within fifteen (15) days
after the applicable Outside Agreement Date, then the arbitrator appointed by one of them shall
reach a decision, notify Lessor and Lessee thereof, and such arbitrator’s decision shall be binding
upon Lessor and Lessee.

50.1.6 If the two (2) arbitrators fail to agree upon and appoint a third arbitrator, or if
both parties fail to appoint an arbitrator, then the appointment of the third arbitrator or any
arbitrator shall be dismissed and the matter to be decided shall be forthwith submitted to arbitration under the
provisions of the American Arbitration Association, but subject to the instruction set forth in
this Paragraph 50.2.

 

 

 

50.1.7 The cost of the arbitration shall be paid by Lessor and Lessee equally.

EXHIBIT A — PREMISES shall hereafter additionally include the Expansion Premises, as per
the revised Exhibit A to the Lease attached hereto.

EXHIBIT D — EXPANSION SPACE PLAN shall be inserted as Exhibit E to the Lease attached hereto.

III. INCORPORATION

Except as modified herein, all other terms and conditions of the Lease between the parties
above described, as attached hereto, shall continue in full force and effect with respect both to
the Original Premises and the Expanded Premises.

IN WITNESS WHEREOF, Lessor and Lessee have executed this Amendment to Lease as of the day and
year first above written.

			
	LESSOR:	 	SCIF PORTFOLIO II, LLC,

a California limited liability company

	 	 	 	 	 	 	 
	By:	 	SCIF Partners II, LLC,	 	 
	 	 	a Delaware limited liability company,	 	 
	 	 	Managing Member	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	Southern California Industrial Fund, LLC,
	 	 
	 

	 	 	 	a California limited liability company,	 	 
	 

	 	 	 	Managing Member	 	 
	 
	 	 	 	 	 	 
	 

	 	By:
	 	The Magellan Group, Inc.
	 	 
	 

	 	 	 	     a Delaware corporation,	 	 
	 

	 	 	 	     Managing Member	 	 

	 	 	 	 	 
	By:

	 	/s/ Martin Slusser
 

Martin Slusser,
	 	 
	 

	 	Chairman of the Board	 	 

	 	 	 	 	 
	By:

	 	/s/ Kevin Staley
 

Kevin Staley,
	 	 
	 

	 	President	 	 

			
	LESSEE:	 	CHROMADEX, INC., a California corporation

	 	 	 	 	 
	By:

	 	/s/ Frank Jaksch
 

Frank Jaksch

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