In all districts, at the time any building or structure is erected,
enlarged, increased in capacity, or changed in use, there shall be
provided improved and usable off-street parking spaces for motor vehicles
in accordance with the requirements of this article and Schedule II. None of the off-street parking facilities as required
herein shall be required for any existing building or use unless said
building shall be enlarged or the use of land changed. In such cases,
off-street parking facilities shall be provided as hereinafter specified
for the building as enlarged or to accommodate the needs of the new
use.
Every use requiring the receipt and distribution of materials
and merchandise by vehicles must provide and permanently maintain
adequate space for loading and unloading services in order to avoid
undue interference with the public use of streets, alleys, or parking
areas.