The following requirements and prohibitions shall apply except as hereinafter provided:
   (A)   Yards and population - No lot area shall be so reduced or diminished that the yards or other open spaces are smaller than prescribed by this chapter, nor shall the density of population be increased in any manner except in conformity with the regulations herein established.
   (B)   Yard for each lot - No yard or other open space provided around any building for the purpose of complying with the provisions of this chapter shall be considered as providing a yard or open space for any other building; provided further, that no yard or open space on an adjoining property shall be considered as providing a yard or open space on a lot whereon a building is to be erected.
   (C)   Buildings on lots - Every building hereafter erected shall be located on a lot as herein defined and in no case shall there be more than one main building and its accessory buildings on one lot, except as hereinafter provided.
   (D)   Parcel as a lot - Every individual parcel of land at the time it was first zoned shall be deemed to be one lot, and not more than one main building shall be permitted on such parcel of land unless all regulations herein established are complied with and a subdivision map is recorded with the county recorder.
   (E)   Yards open to sky - Every required front, side or rear yard shall be open and unobstructed from the ground to the sky.
   (F)   Institutions in R zones - In the R zones, no building shall be erected, structurally altered or used for a school, church, hospital, institution or other similar purpose permitted under the use regulations of this chapter, unless such building is removed at least 50 feet from every boundary line of a property included in any R zone, and provided that no front yard, as required in the zone, shall be used for play or parking purposes.
(`64 Code, Sec. 34-9)  (Ord. No. 1409)