Multifamily residential development of between 10 and 50 units shall provide 250 square feet of space in a usable configuration for play lots, or a shaded area for the elderly or other space for recreation which is appropriate for that development. Multifamily developments of larger than 50 units shall provide for an additional 20 square feet per unit above 50 for such purposes. In large developments, such space shall be subdivided into two or more usable areas, distributed throughout the development so as to be convenient to residents. Barrier-free criteria, as stated in the UCC, must be applied.