Document:

Second Amendment to Physician Employment Agreement

 Exhibit 10.83 
 SECOND AMENDMENT TO 
 PHYSICIAN EMPLOYMENT AGREEMENT 
 This Second Amendment to Physician Employment Agreement (the “Agreement”) dated and effective
October 1, 2006 is by and between 21st Century Oncology, Inc. (“21st Century”) and Michael J. Katin, M.D. (the “Employee”). 
 WITNESSETH 
 WHEREAS, 21st Century and Employee are parties to a Physician Employment Agreement dated April 1, 2004 (the “Agreement”);

 WHEREAS, the parties amended the Agreement as of November 1, 2004; 
 WHEREAS, the parties desire to further amend the Agreement; 
 NOW, THEREFORE, in consideration of the mutual promises and covenants herein contained and for other valuable consideration, receipt of which is hereby acknowledged, the parties hereto agree as follows:

 1. The Agreement is hereby deemed amended as follows: 
 Section 3. COMPENSATION. of the Agreement is amended to decrease the annual base salary of Employee to Seven Hundred Thousand Dollars ($700,000.00). 
 2. Except as set forth above, the Agreement shall in all respects continue to be, and shall remain, unaltered and in full force and effect in accordance
with its terms. This Agreement may be signed in one or more counterparts and by facsimile, all of which shall be considered one and the same agreement. 
 IN WITNESS WHEREOF, the undersigned have executed this instrument effective as of the date set forth herein. 
  

					
	21ST CENTURY ONCOLOGY, INC.	  	EMPLOYEE
			
	By:	  	 /s/ Daniel E. Dosoretz, M.D.
	  	 /s/ Michael J. Katin, M.D.

	Name:	  	Daniel E. Dosoretz, M.D.	  	Michael J. Katin, M.D.
	Title:	  	President and Chief Executive OfficerPhysician Sharing Agreement

 Exhibit 10.84 
 PHYSICIAN SHARING AGREEMENT 
 THIS PHYSICIAN SHARING AGREEMENT (this
“Agreement”) is dated effective as of October 1, 2006 by and between Katin Radiation Therapy, P.A., a Maryland professional corporation (“Katin”), and 21st Century Oncology of Harford County, Maryland LLC, a Maryland
limited liability corporation (“LLC”) 
 WITNESSETH: 
 WHEREAS, Katin and Edward Kiggundu, M.D. (“Kiggundu”) are parties to a physician employment agreement (the “Katin Employment
Agreement”), pursuant to which Kiggundu is employed by Katin to perform professional medical services as a radiation oncologist and Katin compensates Kiggundu for such services; 
 WHEREAS, the compensation paid by Katin to Kiggundu includes an annual Salary and Production Bonus; 
 WHEREAS, the compensation paid by Katin to Kiggundu is amended effective October 1, 2006 to compensate Kiggundu for services provided at the
additional practice locations of LLC (the “Amendment”); 
 WHEREAS, the Katin Employment Agreement provides that
Kiggundu shall provide medical services, on a full-time basis, primarily at Katin’s radiation oncology center in Martinsburg, West Virginia; 
 WHEREAS, Katin has agreed to share the services of Kiggundu with LLC, with Kiggundu’s primary assignment remaining Martinsburg, West Virginia and Kiggundu to also provide services at locations of LLC at 602 South Atwood Road,
Suite 105, Bel Air, Maryland and 1200 Brass Mill Road, Suite E, Belcamp, Maryland; 
 WHEREAS, in connection with its agreement to
share the services of Kiggundu with LLC, Katin desires that LLC agree to reimburse Katin for Kiggundu’s compensation directly attributable to providing services at 602 South Atwood Road, Suite 105, Bel Air, Maryland and 1200 Brass Mill Road,
Suite E, Belcamp, Maryland as provided for in the Amendment, and LLC desires to reimburse such amount to Katin. 
 NOW THEREFORE, in
consideration of the mutual covenants herein contained, the parties, intending to be legally bound, hereby agree as follows 
 1.
Compensation for Additional Services. During the term of this Agreement, LLC hereby agrees to reimburse Katin, on a monthly basis, for the Additional Annual Salary and the Second Performance Bonus, as defined in the Amendment, and paid to
Kiggundu by Katin for such month pursuant to the terms of the Katin Employment Agreement as amended (the “Compensation”). 

 2. Payment of Compensation. LLC’s Compensation shall be determined at the end
of each one month period, and LLC shall reimburse Katin for LLC’s Compensation within thirty (30) days after the end of such one month period. 
 3. Term of Agreement. The term of this Agreement shall be for a period commencing on the date hereof and continuing until the termination of Kiggundu’s employment for the additional practice
locations of LLC covered by the Amendment. 
 4. Amendment and Waivers. No amendment or waiver of any term, provision or
condition of this Agreement shall be effective, unless in writing and executed by Katin and LLC. No waiver on any one occasion shall extend to or effect or be construed as a waiver of any right or remedy on any future occasion. No course of dealing
of any person nor any delay or omission in exercising any right or remedy shall constitute an amendment of this Agreement or a waiver of any right or remedy of any party hereto. 
 5. Assignment. No party hereto may transfer its rights or obligations hereunder without the consent of the other party hereto.

 6. Governing Law; Venue. This Agreement shall be construed, interpreted, and governed in accordance with the laws of
the State of Maryland. Harford County, Maryland shall be the proper venue for any litigation arising out of this Agreement. 
 7.
Headings. The headings of this Agreement are for the purposes of reference only and shall not affect the construction of the Agreement. 
 8. Counterparts. This Agreement may be executed in one or more counterparts all of which taken together shall constitute one and the same instrument. 
  

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 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed as of the
day and year first above written. 
  

			
	KATIN RADIATION THERAPY, P.A.
		
	By:	 	 /s/ Daniel E. Dosoretz

		 	Daniel E. Dosoretz, M.D.
		 	Vice President
	
	 21st
CENTURY ONCOLOGY OF HARFORD
 COUNTY, MARYLAND LLC

		
	By:	 	 /s/ David M. Koeninger

		 	David M. Koeninger
		 	Vice President and CFO

  

 3Pre Construction Management Services Agreement

 Exhibit 10.85 
 PRE CONSTRUCTION MANAGEMENT SERVICES AGREEMENT 
 THIS
CONSTRUCTION MANAGEMENT SERVICES AGREEMENT (this “Agreement”) is made and entered into as of this 1st day of February, 2007 to be effective as of March 23rd, 2006 (the “Effective Date”) by and between Theriac Ent. Of Jacksonville, LLC, a limited liability company (“Owner”) and
Devoto Construction of Southwest Florida, Inc., a Florida corporation (“Devoto”). 
 RECITALS: 
 A. Owner is the owner of that certain real property located at 7809 Baymeadows Road E. (the “Property”). 
 B. Devoto is a wholly owned subsidiary of Radiation Therapy Services, Inc., a Florida corporation (“RTSI”), a developer and operator of
radiation therapy centers. 
 C. Owner desires to develop the Property as a radiation therapy center
meeting the standards and requirements of RTSI for a radiation therapy center under its 21st Century Oncology
flagship brand (the “Project”) and requires construction management services to ensure completion of the Project. 
 D.
Devoto has expertise in providing construction management services. 
 E. Owner desires to retain Devoto to oversee construction of the
Project, act as a liaison between Owner and all architects, engineers, contractors, suppliers and government agencies and provide Owner with construction management services regarding the Project as herein provided. 
 NOW THEREFORE, in consideration of the foregoing and for other valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties agree as follows: 
 SECTION 1 
 CONSTRUCTION MANAGEMENT 
 1.1 Construction Manager. Owner does hereby employ Devoto as its sole and exclusive
construction manager for the Project. Devoto shall oversee construction of the Project, act as a liaison between Owner and all architects, engineers, contractors, suppliers and government agencies regarding the Project and provide construction
management services including ensuring qualified engineers, architects, contractors and suppliers are used, monitoring construction schedules, on-site construction inspection, monitor compliance with plans and specifications, review change orders,
contract administration, providing Owner with status updates and such other management services related to the Project as is reasonably necessary to ensure completion of the Project (the “Services”). 

 1.2 Management Fee. Owner shall pay to Devoto a management fee equal to 30% of the cost of the
Project which shall be payable in [quarterly] installments during the process of the Project. Devoto’s fees for its Services shall be invoiced to Owner and shall be payable by Owner to Devoto within thirty (30) days of the date of
the invoice. Invoices not paid within such thirty (30) day time period shall bear interest at the lesser of eighteen percent (18%) or the maximum contract rate of interest allowable by law. 
 1.3 Indemnity. Owner recognizes and agrees that it is solely responsible for the design, development and construction costs of the Project
including without limitation the costs of architectural, engineering, construction and supplier goods and services rendered by third parties in connection with the Project and Owner shall, at Owner’s sole expense, indemnify, defend and hold
Devoto harmless of, from and against any and all such costs. This Section 1.3 shall survive the termination or expiration of this Agreement. 
 1.4 Termination. This Agreement shall remain in effect until the Project is completed or abandoned and may be terminated by either party prior to such time upon thirty (30) days written notice to the other party or immediately
upon mutual written consent of the parties. 
 SECTION 2 
 GENERAL PROVISIONS 
 2.1 Binding Effect. Subject to any provision hereof restricting
assignment, this Agreement shall be binding upon and inure to the benefit of the executing parties and their respective successors and assigns. 
 2.2 Costs and Attorneys’ Fees. If any party to this Agreement brings or commences any legal action or proceeding to enforce any of the terms of this Agreement (or for damages by reason of an alleged breach of this Agreement),
the prevailing party in such action shall be entitled to recovery of all costs and expenses of litigation, including reasonable attorneys’ fees and costs, as part of its judgment. The prevailing party shall also be entitled to recovery of all
costs and expenses, including reasonable attorneys’ fees, in enforcing any judgment awarded to it. 
 2.3 Relationship of
Parties. Nothing contained in this Agreement shall be deemed or construed, either by the parties hereto or by any third party, to create any partnership, joint venture or other association between Owner and Devoto. 
 2.4 Notices. All notices, including deliveries of documentation (i.e., plans and contracts) for review and approval herein shall be sent by
either personal delivery, a reputable overnight courier which keeps receipts of delivery (such as UPS or Federal Express), or through the facilities of the United States Post Office, postage prepaid, certified or registered mail, return receipt
requested. Any such notice shall be effective upon delivery, if delivered by personal delivery or overnight courier, and seventy-two (72) hours after dispatch, if mailed in accordance with the above. Notices to the respective 
  

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 parties shall be sent to the following addresses unless written notice of a change of address has been previously given
pursuant hereto: 
  

			
	To Owner:	  	 Theriac Ent. Of Jacksonville, LLC

		  	 2234 Colonial Blvd.

		  	 Fort Myers, FL 33907

		  	 Attention: Daniel E. Doseretz, M.D.

		
	To Devoto:	  	 Devoto Construction of Southwest Florida, Inc.

		  	 2234 Colonial Boulevard

		  	 Fort Myers, FL 33907

		  	 Attn: David M. Koeninger

		  	 Phone: (239) 931-7282

		  	 Fax: (239) 931-7380

 2.5 Consents. Whenever in this Agreement a party is, or may be, called upon to give its
consent or approval to any action, except as otherwise specifically provided herein, the consent or approval shall not be unreasonably withheld or delayed. 
 2.6 Entire Agreement; Modification. This Agreement (including the Recitals set forth at the beginning of this Agreement, all of which are incorporated herein by this reference) embodies and constitutes the
entire understanding between the parties with respect to the transaction contemplated herein. All prior or contemporaneous agreements, understandings, representations and statements, oral or written, are merged into this Agreement. Neither this
Agreement nor any provision hereof may be waived, modified, discharged, or terminated except by an instrument in writing signed by the party against which the enforcement of such waiver, modification, amendment, discharge or termination is sought,
and then only to the extent set forth in such instrument. 
 2.7 Applicable Law. This Agreement shall be governed by, and construed in
accordance with, the laws of Florida. 
 2.8 Headings. Descriptive headings are for convenience only and shall not control or affect
the meaning or construction of any provision of this Agreement. 
 2.9 Interpretation. Whenever the context hereof shall so require,
the singular shall include the plural, the male gender shall include the female gender and the neuter, and vice versa, and the use of the terms “include,” “includes” and “including” shall be without limitation to the
items which follow. 
 2.10 Severability. In case any one or more of the provisions hereof shall for any reason be held to be invalid,
illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provision hereof, and this Agreement shall be construed as if such invalid, illegal or unenforceable provision had never been
contained herein. 
  

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 2.11 Joint Drafting. The parties acknowledge that each has played an equal part in the negotiation
and drafting of this Agreement, and in the event any ambiguities should be realized in the construction or interpretation of this Agreement, such ambiguities shall not be construed against either party solely on account of authorship. 
 2.12 Time is of the Essence. The parties acknowledge that time is of the essence for each time and date specifically set forth in this Agreement.

 [signature pages follow] 
  

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

			
	“Owner”
	
	  
		
	By:	 	/s/ Daniel E. Dosoretz
	Name:	 	Daniel E. Doseretz
	Title:	 	Manager
	
	“Devoto”
	
	 DEVOTO CONSTRUCTION OF SOUTHWEST
 FLORIDA,
INC.

		
	By:	 	/s/ David M. Koeninger
	Name:	 	David M. Koeninger
	Title:	 	CFO

  

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