PROMISSORY
      NOTE

     

     

    
      	Borrower: 	Greenstreet Acquisition
              Corp.
	 	2601 South Bayshore
              Drive,
              Suite 800 
	 	Coconut Grove, Florida
              33133
	 	 
	
              Lender:  

            	GRST
              Acquisition, LLC
	 	 
	Principal Amount: 	$250,000


    

     

    
      	1.	
              FOR
                VALUE RECEIVED, Greenstreet Acquisition Corp. promises to pay to
                GRST
                Acquisition, LLC, at such address as may be provided in writing to
                Greenstreet Acquisition Corp., the principal sum of two hundred fifty
                thousand dollars ($250,000) in lawful money of the United States
                of
                America or such lesser amount, as the case may be, equal to the funds
                advanced by GRST Acquisition, LLC to or on behalf of Greenstreet
                Acquisition Corp. Documentation to substantiate all amounts advanced
                to or
                on behalf of Greenstreet Acquisition Corp. pursuant to this Note
                shall be
                attached hereto as such funds are so advanced.


            


    

     

    
      	2.	
              This
                Note will be repaid in full on June 30, 2008.


            


    

     

    
      	3.	
              At
                any time, Greenstreet Acquisition Corp. may pay the outstanding balance
                then owing under this Note to GRST Acquisition, LLC without premium
                or
                penalty.

            


    

     

    
      	4.	
              This
                Note will be construed in accordance with and governed by the laws
                of the
                State of New York, without regard to conflicts of laws principles
                thereof.

            


    

     

    
      	5.	
              If
                any term, covenant, condition or provision of this Note is held by
                a court
                of competent jurisdiction to be invalid, void or unenforceable, it
                is the
                parties’ intent that such provision be reduced in scope by the court only
                to the extent deemed necessary by that court to render the provision
                reasonable and enforceable and the remainder of the provisions of
                this
                Note will in no way be affected, impaired or invalidated as a
                result.

            


    

     

    
      	6.	
              All
                costs, expenses and expenditures including, and without limitation,
                the
                reasonable legal costs incurred by GRST Acquisition, LLC in enforcing
                this
                Note as a result of any default by Greenstreet Acquisition Corp.,
                will be
                added to the principal then outstanding and will immediately be paid
                by
                Greenstreet Acquisition Corp.

            


    

     

    
      	7.	
              This
                Note will inure to the benefit of and be binding upon the respective
                heirs, executors, administrators and successors of Greenstreet Acquisition
                Corp. and GRST Acquisition, LLC. Greenstreet Acquisition Corp. waives
                presentment for payment, notice of non-payment, protest and notice
                of
                protest. 

            


    

     

    
      	8.	
              In
                the event that an initial public offering of securities of Greenstreet
                Acquisition Corp. (the “IPO”) is completed before June 30, 2008,
                Greenstreet Acquisition Corp. will make full repayment of this Note
                within
                seven days following the
                IPO closing date.

            


    

     

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    IN
      WITNESS WHEREOF, Greenstreet Acquisition Corp., intending to be legally bound
      hereby, has caused this Promissory Note to be duly executed by the authorized
      officer named below this 13th day of December, 2007.

     

    
      	 	 	 
	 	GREENSTREET
              ACQUISITION CORP.
	 
 	 
 	 
 
	 	By:  	    
              /s/
              Jeffrey Safchik   
	 	
              

              Name:
                Jeffrey Safchik

              Title:  
                Chief Financial Officer