The PCD zone shall not be established on a lot or contiguous lots having a total area of less than ten or more than 100 gross acres of land unless a variance from the minimum or maximum area has been granted pursuant to Chapter 17.96 (hereinafter referred to as "this chapter"); provided, however, that in no event shall a variance be granted to allow a PCD zone classification on a lot or contiguous lots less than two gross acres in area, as measured to the centerline of any streets. A lot or lots having a total area less than ten gross acres may be changed to a PCD zone, if the lot or lots are contiguous to land which is in a PCD zone.
(`78 Code, § 17.52.030.)