A "zoning lot" is either:
A. A lot of record existing on the effective date of the ordinance codified in this title or any applicable subsequent amendment thereto; or
B. A tract of land, either unsubdivided or consisting of two or more contiguous lots of record, located within a single block which, on the effective date of the ordinance codified in this title or any applicable subsequent amendment thereto, was in single ownership; or
C. A tract of land, located within a single block, which at the time of filing for a building permit (or, if no building permit is required, at the time of filing for a certificate of occupancy), is designated by its owner or developer as a tract of all of which is to be used, developed, or built upon as a unit under single ownership.
(Ord. 81-11 Art. II (part), 1980).