apartment building means a residential use building, or the residential use portion of a mixed-use building, other than a townhouse or stacked townhouse containing four or more dwelling units each of which shall have access to above grade common halls, stairs, elevators, and yards;
Public building and "public work" means a public building of, and a public work of, a governmental entity (the United States; the District of Columbia; commonwealths, territories, and minor outlying islands of the United States; State and local governments; and multi-State, regional, or interstate entities which have governmental functions). These buildings and works may include, without limitation, bridges, dams, plants, highways, parkways, streets, subways, tunnels, sewers, mains, power lines, pumping stations, heavy generators, railways, airports, terminals, docks, piers, wharves, ways, lighthouses, buoys, jetties, breakwaters, levees, and canals, and the construction, alteration, maintenance, or repair of such buildings and works.
Main building means a building in which is conducted the main or principal use of the parcel on which it is erected;
Building means any structure used or intended for supporting or sheltering any use or occupancy.
Outbuilding means and refer to structures such as (by way of example and not limitation) storage buildings, sheds, greenhouses, gazebos and other Roofed Structures.