Building.
Building. The term building generally means any structure or edifice enclosing a space within its walls, and usually covered by a roof, the purpose of which is, for example, to provide shelter or housing or to provide working, office, parking, display, or sales space. The term includes, for example, structures such as apartment houses, factory and office buildings, warehouses, barns, garages, railway or bus stations, and stores. Any structure that is classified as a building for purposes of section 48(a)(1)(B) and 1.481 shall be treated as such for purposes of this section.