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City of San Mateo Municipal Code.

27.21.130 Lands Not Eligible for Urban Lot Splits

The following lands classified as R1-A, R1-B, and R1-C are not eligible for an Urban Lot Split under this Article, if the parcel meets either of the following:

(a) Any parcel that was established through prior approval of an Urban Lot Split subdivision as provided for in this Article; or

(b) Any parcel proposed to be subdivided that is adjacent to another parcel where either the owner of the parcel proposing to be subdivided or any person acting in concert (as defined in Section 27.21.020(b)) with said owner has previously subdivided the adjacent parcel using the provisions of this Article.