- 39 -                                         
          involve heavy machinery.  We stated in Texas Instruments that, to           
          the extent that the component also served as a floor, "this use             
          '[was] strictly incidental to the use that necessitated its                 
          special design.'"  Id. (quoting Rev. Rul. 79-183, supra, 1979-1             
          C.B. at 45).  In addition, we held that another floor in Texas              
          Instruments was not tangible personal property, because "it was             
          not so specially designed, constructed, or used to serve other              
          qualifying property".  Id.                                                  
               We note that the Reserve Facility's concrete slab floor is             
          thicker than a conventional warehouse floor.  The thickness of              
          the Reserve Facility's concrete slab floor is due primarily to              
          petitioner's choice of structural support; i.e., the racks, which           
          are not qualifying property.11  However, we do not find that the            
          thickness of the concrete slab was essential to the operation of            
          petitioner's transtackers, which are qualifying property.                   
          Consequently, the function of the concrete slab floor as a                  
          structural component was not strictly incidental to its special             
          design; rather, its function as a structural component of the               
          Reserve Facility necessitated its special design.                           
               Petitioner also argues that the concrete slab's special                
          design is necessary for the efficient operation of the                      
          11A conventional warehouse floor would require footings                     
          under the structural support columns.  These footings would be              
          thicker than the rest of the conventional floor slab.  The size             
          of the footings would depend upon the column loads and soil                 
          characteristics of the site.                                                
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