Off-street parking, unloading and service requirements of this section shall apply and govern all present and future zoning districts for permitted uses except in the C-1 District where no building expansion is proposed. No additional private off-street parking spaces shall be required in the C-1 District for permitted uses where no building expansion is proposed.. Where a building expansion of five hundred (500) square feet or more is proposed, off-street parking spaces for nonresidential uses shall be required at the rate of one (1) space for each three hundred (300) square feet of gross building area. Off-street parking for residential uses shall be provided in accordance with subsection 31-27.19.

Except as provided in this section, no application for a building permit shall be approved unless there is included with the plan for such building, improvement or use, a plat plan showing the required space reserved for off-street parking, unloading and service purposes.

An occupancy permit shall not be issued unless the required off-street parking, unloading and service facilities have been provided in accordance with those shown on the approved plan, except that a statement is attached to the permit specifying a specific date on which improvements shall be completed. Such period of time is not to exceed one hundred twenty (120) days. If improvements are not completed within the prescribed period of time, the permits are automatically revoked.