A landholding agency may be the disposal agency for real and related personal property when—
    
    
        
        (a) 
         The agency has statutory authority to dispose of real and related personal property;
     
    
        
        (b) 
         The agency has delegated authority from GSA to dispose of real and related personal property; or
     
    
        
        (c) 
         The agency is disposing of—
     
    
        
        (1) 
         Leases, licenses, permits, easements, and other similar real estate interests held by agencies in non-Government-owned real property;
     
    
        
        (2) 
         Government-owned improvements, including fixtures, structures, and other improvements of any kind as long as the underlying land is not being disposed; or
     
    
        
        (3) 
         Standing timber, embedded gravel, sand, stone, and underground water, without the underlying land.