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City of San Mateo Municipal Code.

27.20.050 MINIMUM DEVELOPMENT STANDARDS.

(a) Every one family dwelling hereafter constructed or structurally altered to create an additional dwelling unit shall be on a parcel having a minimum width and area as required in the R1-C districts.

(b) Every two family dwelling hereafter constructed shall be on a parcel having the following minimum area:

Date Recorded Area (square feet)
Prior to March 3, 1947* 4,400
After March 3, 1947 5,000
* Parcels must also be northeast of El Camino Real.

(c) Minimum parcel sizes for special uses shall be at least the same as that prescribed for permitted uses. The planning commission may require additional land area at the time a special use is authorized.

(d) All lots located in an R2 district shall have a frontage of not less than thirty (30) feet on a publicly dedicated street as shown on a subdivision map accepted by the City and as recorded in the office of the recorder of San Mateo County, or as designated by a resolution pursuant to Section 17.04.010, unless a permanent easement of access to a public street was of record prior to the effective date of this title, or unless approved pursuant to proceedings authorized by this title. The minimum width of all such parcel shall be not less than thirty (30) feet for a distance of not less than one hundred twenty (120) feet from the frontage property line; provided thereafter the width of the parcel conforms (as to the residue of the parcel) to the required average parcel width requirement of the district wherein the parcel is located.