An OA defines GSA's relationship with each customer agency and:
    
    
        
        (a) 
         Establishes specific financial terms, provisions, rights, and obligations of GSA and its customer for each space assignment;
     
    
        
        (b) 
         Minimizes exposure to future unknown costs for both GSA and customer agencies;
     
    
        
        (c) 
         Stabilizes Rent payments to the extent reasonable and desired by customers; and
     
    
        
        (d) 
         Allows tailoring of space and related services to meet customer agency needs.