Document:

EXHIBIT 10.91

                                 AMENDMENT NO. 3
                    TO AMENDED & RESTATED SECURITY AGREEMENT

This AMENDMENT NO. 3 TO AMENDED & RESTATED SECURITY AGREEMENT (this
"AMENDMENT"), is made effective as of March 14, 2008 (the "EFFECTIVE DATE"), by
and between U.S. HELICOPTER CORPORATION, a Delaware corporation with its
principal place of business located at 6 East River Piers, Suite 216, Downtown
Manhattan Heliport, New York, New York 10004 (the "COMPANY") and YA GLOBAL
INVESTMENTS, L.P. (the "SECURED PARTY") with reference to the following
recitals:

A. Secured Party and the Company entered into that certain Amended & Restated
Security Agreement, dated March 30, 2007, as amended by that certain Amendment
No. 1 to Amended & Restated Security Agreement as of May 14, 2007 and that
certain Amendment No. 2 to Amended & Restated Security Agreement as of August
24, 2007 (as amended, the "MASTER AGREEMENT").

B. Contemporaneously with the execution of this Amendment, the Secured Party and
the Company are entering into a Securities Purchase Agreement (the "SPA")
pursuant to which the Company shall issue and sell to the Secured Party
additional secured debentures (the "ADDITIONAL DEBENTURES").

C. To induce the Investor to execute and deliver the SPA and purchase the
Additional Debentures, the Company has agreed to amend the Master Agreement to
provide certain amendments to the Master Agreement to specifically include the
Additional Debentures as part of the "Obligations" as defined in the Master
Agreement.

FOR GOOD AND VALUABLE CONSIDERATION, the receipt and sufficiency of which is
hereby acknowledged, Investor and the Company agree as follows:

1. CONVERTIBLE DEBENTURES. The Definition of the term "Convertible Debentures"
as used in the Master Agreement shall hereinafter include the Additional
Debentures.

2. TRANSACTION DOCUMENTS. The Definition of the term "Transaction Documents" as
used in the Master Agreement shall hereinafter include the Additional Debentures
and the SPA entered into on the date hereof.

3. OBLIGATIONS SECURED. The definition of the term "Obligations" as used in the
Master Agreement shall include all the obligations of the Company to the Secured
Party under the Additional Debentures.

4. FILINGS. The Company shall make, execute, acknowledge and deliver to the
Secured Party such documents and instruments, including, without limitation,
financing statements, certificates, affidavits and forms as may, in the Secured
Party's reasonable judgment, be necessary to effectuate, complete or perfect, or
to continue and preserve, or amend, the security interest of the Secured Party
in the Pledged Property.

5. DEFINITIONS. Capitalized terms not otherwise defined herein shall have the
meaning ascribed to them under the Master Agreement.

6. NON-IMPAIRMENT. Except as expressly modified herein, the Master Agreement
shall continue in full force and effect, and the parties hereby reinstate and
reaffirm the Master Agreement as modified herein.

7. INCONSISTENCIES. In the event of any inconsistency, ambiguity or conflict
between the terms and provisions of this Amendment and the terms and provisions
of the Master Agreement, the terms and provisions of this Amendment shall
control.

8. COUNTERPARTS. This Amendment may be executed in any number of counterparts,
each of which when executed will be deemed an original and all of which, taken
together, well be deemed to be one and the same instrument.

                   REMAINDER OF PAGE INTENTIONALLY LEFT BLANK

                                      -1-
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
of the date first above written.

                                           COMPANY:
                                           U.S. HELICOPTER CORPORATION

                                           By:  /S/ JOHN G. MURPHY
                                                ------------------
                                           John G. Murphy
                                           Chief Executive Officer and President

                                           SECURED PARTY:
                                           YA GLOBAL INVESTMENTS, L.P.

                                           By:      Yorkville Advisors, LLC
                                           Its:    Investment Manager

                                           By:    /S/ MARK ANGELO
                                                  ---------------
                                           Name:  Mark Angelo
                                           Title:  Portfolio Manager

                                      -2-THIRD AMENDMENT TO RESTRICTED STOCK AWARD AGREEMENT

 

This Third Amendment to Restricted Stock Award Agreement (this “Third Amendment”) is made as of March 17, 2008 by and between SUN COMMUNITIES, INC., a Maryland corporation (the “Company”), and GARY A. SHIFFMAN (“Employee”).

 

RECITALS:

 

A.    The Company and Employee entered into that certain Restricted Stock Award Agreement, dated as of May 10, 2004, as amended (the “Award Agreement”), pursuant to which the Company issued Employee 75,000 shares of the Company's Common Stock.

 

B.           The Company and Employee desire to modify the Award Agreement in accordance with the terms and conditions of this Third Amendment.

 

NOW, THEREFORE, the parties agree as follows:

 

1.            All capitalized terms used but not otherwise defined herein shall have the meaning ascribed to such terms in the Award Agreement.  

 

2.            The opening paragraph of the Award Agreement is hereby deleted in its entirety and replaced with the following opening paragraph:

 

“Sun Communities, Inc., a Maryland corporation (the “Company”), upon the recommendation of the Company's Board of Directors (the “Board”) and pursuant to that certain Amended and Restated 1993 Stock Option Plan adopted by the Company's Board of Directors (the “Plan”) and approved by its shareholders, and in consideration of the services to be rendered to the Company or its subsidiaries by  Gary A. Shiffman (“Employee”), hereby grants and issues, as of May 10, 2004  (the “Date of Grant”), to Employee eighteen thousand seven hundred and fifty (18,750) shares of the Company's Common Stock, par value $0.01 per share (the “Shares”), subject to the terms and conditions contained in this Restricted Stock Award Agreement (the “Agreement”) and subject to all the terms and conditions of the Plan, which are incorporated by
reference herein.  Employee agrees to the provisions set forth herein and in the Plan and acknowledges that each such provision is a material condition of the Company’s agreement to issue the Shares to him.  All capitalized terms used but not otherwise defined in this Agreement shall have the meanings ascribed to such terms in the Plan.”

 

3.            Section II(a) of the Award Agreement is hereby deleted in its entirety and replaced with the following Section II(a):

 

“Subject to the restrictions and conditions set forth in the Plan, 18,750 of the Shares (the “Time-Vesting Shares”) shall vest in full on May 10, 2007, provided that Employee is employed by the Company on such date.”

 

 

4.            Section II(b) of the Award Agreement is hereby deleted in its entirety and replaced with the following Section II(b):

 

“Intentionally omitted.”

 

5.            Section II(d) of the Award Agreement is hereby deleted in its entirety and replaced with the following Section II(d):

 

“(d)  Notwithstanding anything to the contrary herein, upon the death or Disability of Employee, all unvested Time-Vesting Shares shall immediately become fully vested and not forfeitable.  Notwithstanding anything to the contrary herein, upon the occurrence of a Change of Control Event, all unvested Shares shall immediately become fully vested and not forfeitable.”

 

6.            Section IV of the Award Agreement is hereby deleted in its entirety and replaced with the following Section IV:

 

“Notwithstanding Section 9.06 of the Plan to the contrary, Employee shall be entitled to all of the rights of a stockholder with respect to the Time-Vesting Shares, including the right to vote such Time-Vesting Shares and to receive dividends and other distributions payable with respect to such Time-Vesting Shares from and after the Date of Grant; provided that any securities or other property (but not cash) received in any such distribution with respect to any Time-Vesting Shares that are still subject to the restrictions of Section II and III of this Agreement shall be subject to all of the restrictions in this Agreement with respect to such Time-Vesting Shares.”

 

7.            Except as otherwise modified herein, the Award Agreement shall remain in full force and effect consistent with its terms.

 

8.            This Third Amendment may be executed by the parties in counterparts, each of which shall constitute an original and both of which together shall constitute one and the same agreement.  Facsimile copies of signatures to this Amendment shall be deemed to be originals and may be relied upon to the same extent as the originals.

 

 

[Signatures on the following page]

IN WITNESS WHEREOF, the Company and Employee have executed this Third Amendment to Restricted Stock Award Agreement as of the date first above written.

 

 

	
             
 	
             
 	
            COMPANY:
 
	
             
 	
             
 	
            SUN COMMUNITIES, INC.,
 a Maryland corporation

 
 
	
             
 	
             
 	
            By:
 	
            
 /s/ Karen J. Dearing
 
	
             
 	
             
 	
             
 	
            Karen J. Dearing, Chief Financial Officer 
 

 

 

 

	
             
 	
             
 	
            EMPLOYEE:
 
	
             
 	
             
 	
             
 
	
             
 	
             
 	
             
 	
            
 /s/ Gary A. Shiffman
 
	
             
 	
             
 	
             
 	
            GARY A. SHIFFMAN

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