No building or structure shall hereafter be erected or structurally altered in an M-1 District unless the following yards are provided and maintained in connection with the building:
(a) Front Yard. On every zoning lot a front yard of not less than thirty feet in depth shall be provided. However, where lots within the same block and comprising forty percent of the frontage on the same street are already developed on the effective date of this section (Ordinance 10-16-67, passed November 20, 1967) with front yards with an average depth of less than thirty feet, then such average depth shall be the required front yard depth for such frontage in that block.
(b) Side Yards. On every zoning lot a side yard shall be provided along each side lot line. Each side yard width shall be not less than ten percent of the lot width, but width need not exceed twenty feet.
(Ord. 10-16-67. Passed 11-20-67.)
(Ord. 10-16-67. Passed 11-20-67.)