Units with a gross floor area up to 50.00 sq. meters - provide one (1) pooled parking slot* for every six (6) medium cost units or for a fraction thereof, e.g., another slot* shall be provided if there are more than six (6) but less than twelve (12) medium cost units, etc., or provide one (1) parking slot* for each open market unit (as defined under the revised IRR of PD 957);