Designated open space on a zoning lot may count as lot area for the purposes of the applicable regulations on yards, floor area ratio, open space ratio, open space, lot coverage, lot area or density, provided that the area of the designated open space claimed as lot area does not exceed the area of the zoning lot located outside the designated space. For a single-family residence, any portion of a zoning lot occupied by designated open space shall count as lot area for the purposes of satisfying minimum density requirements only pursuant to this Section.

Where the area of the designated open space claimed as lot area exceeds the above permitted amount, the provisions of Section 107-72 (Qualification of Designated Open Space as Lot Area) shall apply.

Any designated open space, or portion thereof, claimed as required open space or used to satisfy the lot coverage restrictions for a development containing residences shall be accessible to and usable by all residents of the zoning lot.

In the case of a large-scale residential development, any designated open space, or portion thereof, that qualifies as lot area may be used as common space.