The purpose of the "B" combining lot size district is to establish compatible lot sizes in certain areas within the city as determined at the time a subdivision map or parcel map is recorded and the property is zoned to a specific zone district adding the "B" district to the basic zone district. With a combined lot size in square footage or acreage, for example R-1-B-7,000 requires a minimum lot size of 7,000 square feet. This district is consistent with all general plan designations and zone districts.

The site development standards of the basic zone district which is combined with the "B" district shall apply except for the minimum building site area which will be determined when the "B" district is combined.