Individual uses already in existence in this zone, at the date of passage of this section, shall be considered permitted uses in this zone, but shall conform to all other requirements of this zone. Upon passage of this section, the zoning officer shall make a determination as to the use of each parcel and building in this zone. Each use shall be assigned an appropriate general use category (residential, business, industrial, public and institutional) and sub-category (single-family, two-family, etc.; retail, service, etc.; manufacturing, warehousing, etc.; church, park, etc.). The zoning officer shall maintain a record of such uses and no change of use, under this section, from the existing general use category or sub-category shall be permitted except to a permitted use in this zone.

All primary uses permitted in the R-75 zone.

Professional and business offices.