When a common off-street parking facility, located within four hundred (400) feet of the uses served will provide twenty (20) or more parking spaces, the total number of parking spaces required for all the uses served may be reduced by not more than twenty-five percent (25%) upon a finding by the Site Plan Review Committee that the typical use of the off-street parking facility would be staggered to such an extent that the reduced number of spaces would be adequate to serve all uses sharing the facility.