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City of San Mateo Municipal Code.

27.62.055 LOT SIZE AND WIDTH.

(a) The lot size and width requirements of the underlying zone shall apply unless the proposed development site is over one acre in size and it can be demonstrated that:

(1) A better design will be achieved by not adhering to Zoning Code requirements by:

(A) Preserving and enhancing existing site elements such as, but not limited to, heritage trees, topography, waterways, important historical or architectural resource, views, natural open space and archaeological sites; or

(B) Providing common open space and recreational facilities sufficient to meet the needs of the intended inhabitants; and

(2) Adherence to the requirements of the Zoning Code is not required in order to insure the health, safety, and welfare of inhabitants of the development or adjacent properties.

(b) Regardless of the approved lot size and width, in no case shall the residential planned unit development exceed the unit density development standards of the underlying zone.