What term describes the total open space required for each type of use or occupancy for a given lot?

The term that accurately describes the total open space required for each type of use or occupancy for a given lot is known as total open space within lot. This designation refers specifically to the overall amount of space available on the lot for open areas, which may include landscaping, recreational areas, and other types of open spaces as per zoning and building regulations. Each type of occupancy may have distinct requirements based on local building codes, which take into consideration various factors such as density, safety, and environmental impact.

The other terms, while they may relate to open space in some capacity, do not encompass the full scope defined in the question. For instance, usable open space typically pertains to areas that can serve an intended purpose, rather than the total amount required overall. Designated open area often implies a specific portion of a lot set aside for certain uses but does not necessarily account for the entirety of open space requirements. Common area usually refers to shared spaces in multi-unit developments, emphasizing communal use rather than specifying the total open space for a single lot based on occupancy type. Hence, the correct term specifically highlighting total open space for a lot aligns best with total open space within lot.