One of the main differences between strata and community titles is the way the land boundaries are defined. Strata titles are defined by the boundaries of the building rather than the land, with an area of common property for all residents, while community titles are defined by the lot boundaries and surveyed measurements. Because strata titles apply to structures like apartment blocks, townhouses and duplexes, boundaries are divided into units, rather than land allotments. Unit divisions are determined through structural divisions of a building, not by reference to the land. For instance, the inside lining of the wall, the bottom of the ceiling, the top of the floor – all of these can be used as references of where a particular unit begins and ends. Common property areas in a strata plan can consist of areas like shared driveways, elevators, stairways, lobbies, landscapes and gardens.