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Monument Preservation


The Monument Preservation Fund maintains the City's existing survey monuments through a long-term plan to inventory, reference and replace lost monuments.

Survey monuments are essential to the precise location of all land divisions (parcels) within the City and County of San Francisco. The framework for actual physical reference points, known as monuments, has been previously established and must be preserved in order to secure ownership boundaries. The City's monument system consists of known points that serve as the basis of reference for subsequent new and existing land subdivisions.

In San Francisco, it is the responsibility of the City and County Surveyor to ensure that the existing reference framework of control points known as monuments is maintained.


More Background

Historically, a property description and map relied upon nearby natural landmarks as monuments such as trees, or stones, to identify the physical boundaries of a parcel. In the last 200 years, the transitory nature of such physical features dictated that more permanent system of (monument) points be established. In San Francisco, more than 3000 monument points are documented and serve to form an underlying framework to reference City land subdivisions.


Protection and Preservation Prior to Construction

Guidelines establishing the protection and preservation of survey monuments prior to construction are outlined in Public Works Order 178,985.


Monument Preservation Fund

The Monument Preservation Fund will be used to ensure continued existence and accuracy of these needed monuments. As known reference points are lost or disturbed, precise boundary locations become increasingly difficult to survey due to the availability of fewer reference locations. The fund is dedicated to the maintenance and re-establishment of the monuments that are necessary to locate land, describe and map boundaries vital to public and private land ownership and related property rights.



San Francisco Public Works
Bureau of Street-use and Mapping
1155 Market Street, 3rd Floor (Map)
San Francisco, CA 94103
Phone: (415) 554-5827