Document:

Supplemental Agreement

 

Party A: Boxing County Chengli Gas Supply
Co., Ltd.

Party B: Xi’an Zhonghong New Energy
Technology Co., Ltd.

 

Whereas, Party B is
responsible for the operation of the project upon its completion, including maintenance of CDQ main equipment and staff remuneration,
etc., but Party B lacks of operation experience. Based on mutual benefits and friendly negotiation, both parties agree to make
following amendments to the original agreement:

 

		1.	Section 2 of Item Four of the original agreement: which is amended as, after the project is completed
and put into operation, the cooperation model is “BO”, energy-saving service fee shall be charged at RMB 0.42 /Kwh
(excluding tax).

		2.	Party A agrees that Party B can subcontract the operation of the project to third party company
that Party A approves. Party B shall undertake all operational expenses and performance obligations.

 

The supplemental agreement is in duplicate
copies and each party has one copy with full legal force. The agreement shall take effect after it is signed and sealed.

 

Party A: Boxing County Chengli Gas Supply
Co., Ltd.

Authorized Representative:

Date:

 

Party B: Xi’an Zhonghong New Energy
Technology Co., Ltd.

Authorized Representative:

Date:Exhibit 10.66

 

Confidential material appearing in this document
has been omitted and filed separately with the Securities and Exchange Commission in accordance with Rule 24b-2, promulgated under
the Securities and Exchange Act of 1934, as amended. Omitted information has been replaced with asterisks.

 

ADDENDUM FIVE

 

TO LEASE AGREEMENT FOR A GAMMA KNIFE
UNIT

 

This ADDENDUM FIVE
TO LEASE AGREEMENT FOR A GAMMA KNIFE UNIT (this “Addendum Five”) is dated effective as of May 18, 2012, and is entered
into between (i) GK FINANCING, LLC, a California limited liability company (“GKF”), and (ii) SUNRISE HOSPITAL AND MEDICAL
CENTER, LLC, a Delaware limited liability company that is qualified to do business in the State of Nevada, d/b/a/ Sunrise Hospital
and Medical Center (“Medical Center”), with reference to the following recitals:

 

Recitals:

 

A.Medical
Center owns and operates an acute care hospital facility located at 3186 South Maryland Parkway, Las Vegas, NV 89109.

 

B.On
June 3, 1999, GKF and Medical Center executed a Lease Agreement for a Gamma Knife Unit, which Lease Agreement was amended by (i)
a certain Addendum dated effective December 1, 1998, (ii) a certain Addendum Two (“Addendum Two”) dated effective January
17, 2007, (iii) a certain Addendum Three (“Addendum Three”) dated effective June 20, 2007, and (iv) a certain Addendum
Four (“Addendum Four”) dated effective February 8, 2010 (collectively, and as amended, the “Lease”).

 

C.The
parties desire to further amend the terms and provisions of the Lease as set forth herein.

 

NOW THEREFORE, in consideration
of the mutual covenants and agreements set forth herein, and for other good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, the parties agree as follows:

 

Agreement:

 

1.Defined
Terms. Unless otherwise defined herein, the capitalized terms used herein shall have the same meanings set forth in the
Lease.

 

2.Extension
of Lease Term. It is acknowledged that the Commencement Date of the Lease was January
8, 2001. Pursuant to Addendum Four, the Term of the Lease was extended to January 8, 2013. Pursuant to this Addendum Five, the
Term of the Lease is hereby further extended for an additional six (6) years, which extended Term shall expire on January 8, 2019;
provided that, the Term of the Lease shall be further extended for the period
of time that the Equipment is unavailable to perform procedures due to the Reload (which is estimated to take approximately three
(3) weeks for the Reload). All references in the Lease to the “Term” shall be deemed to refer to the Term,
as extended hereby.

 

    	-1-

    	 

    

 

Exhibit 10.66

 

3.Cobalt
Reload of the Equipment. The Equipment shall be reloaded with new Cobalt-60
that meets the manufacturer’s radioactivity level specifications (the “Reload”), subject to the following terms
and conditions:

 

		a.	Scheduling and Process for the Reload. The Reload shall be performed at the Site and shall
include any required installation and rigging. Subject to scheduling availability, GKF shall use its commercially reasonable efforts
to perform the Reload in the first quarter of 2013; provided that the Reload shall be performed only after all necessary
and appropriate licenses, permits, approvals, consents and authorizations, including, without limitation, the proper handling of
the Cobalt-60 (collectively, the “Permits”), have been obtained by Medical Center at Medical Center’s sole cost
and expense. The timing and procedure for such Reload shall be as mutually agreed upon between the parties. Notwithstanding anything
to the contrary contained in this Addendum, GKF makes no representation or warranty to Medical Center concerning the Reload, and
GKF shall have no obligation or liability to pay any damages to Medical Center resulting therefrom, including, without limitation,
any lost revenues or profits during the period of time that the Equipment is unavailable to perform procedures due to the Reload
process.

 

		b.	Medical Center Personnel and Services. Upon request and as required by GKF, Medical Center,
at Medical Center’s cost and expense, shall provide GKF with Medical Center personnel (including Medical Center’s physicists)
and services in connection with the Reload, among other things, to oversee, supervise and assist with construction and compliance
with local, state and federal regulatory requirements and with nuclear regulatory compliance issues and the calibration of the
Equipment.

 

		c.	Cost of Reload. Subject to Sections 3.a and 3.b above, the actual costs of the Reload paid
or payable to third parties shall be the sole responsibility of GKF. Medical Center shall not be entitled to reimbursement for
its personnel costs, internal costs or overhead in performing its duties under Section 3b above.

 

		d.	No Additional Responsibilities. It is understood by the parties that GKF is not responsible
for any upgrades, hardware, cobalt reloading, software changes and/or other modifications to the Equipment, except as expressly
set forth herein or otherwise agreed upon in writing by Medical Center and GKF.

 

4.Per
Procedure Payments. In consideration of the Reload and notwithstanding anything to the
contrary set forth in the Lease, commencing from and after January 8, 2013, Medical Center shall pay to GKF a per procedure payment
as stipulated in Exhibit “A” attached hereto. The term “procedure” shall mean each individual treatment
session (fraction) that involves stereotactic, external, single fraction, conformal radiation, commonly called radiosurgery, that
may include one or more isocenters during the patient treatment session, delivered to any site(s) superior to the foramen magnum,
whether performed on an inpatient or outpatient basis, using the Equipment and/or any other equipment or devices that are used
in lieu of, or as an alternative to, the Equipment. The parties acknowledge that the per procedure payments represent fair market
value for the use of the Equipment as described in the Agreement. Nothing set forth herein shall amend or otherwise affect (i)
the per procedure payments set forth in Addendum Four which shall remain in effect until January 8, 2013, and (ii) the per case
reimbursement rates for medical radiation physicist services payable to GKF pursuant to Addendum Two.

 

    	-2-

    	 

    

 

Exhibit 10.66

 

5.Transfer
of Equipment Ownership. If, on the expiration of the Term (as extended),
no Event of Default by Medical Center (and no event or condition which with the giving of notice and/or the lapse of time would
constitute such an Event of Default) then exists and is continuing under the Lease, then, GKF shall quitclaim to Medical Center
all of GKF’s right, title and interest in and to the Equipment on an “as is, where is” basis, without representation
or warranty.

 

6.Captions.
The captions and paragraph headings used herein are for convenience only and shall not be used in construing or interpreting this
Addendum.

 

7.Full
Force and Effect. Except as amended by this Addendum Five, all of the terms and provisions of the Lease shall remain in
full force and effect.

 

IN WITNESS WHEREOF,
the parties have executed this Addendum Five effective as of the date first written above.

 

	GK FINANCING, LLC	 	SUNRISE HOSPITAL AND MEDICAL 	 
	 	 	CENTER, LLC	 
	 	 	 	 
	By:	/s/ Ernest A. Bates, MD	 	By:	/s/ Chris A. Mowan	 
	 	Ernest A. Bates, M.D.	 	Name:  	Chris A. Mowan	 
	 	Policy Committee Member	 	Title:    	Chief Operating Officer	 

 

 

 

    	-3-

    	 

    

 

Exhibit 10.66

 

Exhibit
“A”

 

PER PROCEDURE
PAYMENTS

 

 

 

	Annual Procedures Performed	Per Procedure Payment
	*	* per Procedure
	*	* per Procedure

 

 

 

Notwithstanding
anything to the contrary set forth herein, for purposes of determining the per procedure payments pursuant to this Exhibit "A,"
(a) only those "procedures" (as defined in Section 4 of this Addendum Five) performed on or after January 8, 2013 shall
be counted; (b) the number of annual procedures performed shall be reset to zero (0) on January 8, 2014 and on each anniversary
date thereafter; and (c) there shall be no retroactive adjustment of the per procedure payments irrespective of whether the number
of procedures performed during any annual measuring period reaches a lower per procedure payment level. For example, if during
an annual measuring period, * procedures are performed, then, Medical Center would pay * for each of the first * procedures, and
* for each of the next * procedures (i.e., for procedures * through*). There are no minimum volume requirements.

 

    	-4-

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