While HALS documentation serves as the architectural and botanical archive, the legal protection of a historic landscape in California is governed at the state level. To ensure that landscape preservation plans are legally binding and technically compliant with state mandates, HALSCA aligns all property surveys with the master registries maintained by the California Office of Historic Preservation (OHP).
The California Register of Historical Resources is the authoritative guide used by state and local agencies, private groups, and citizens to identify the state's most significant historic and archaeological properties. Unlike federal recognition—which is often purely honorary—listing on the California Register carries profound legal weight, particularly when a historic landscape is threatened by modern development or aggressive rezoning.
Landscape architecture has historically been underrepresented in state registries, with focus disproportionately placed on physical buildings. HALSCA advocates for the explicit inclusion of "designed landscapes" and "cultural landscapes" as standalone entities within the state records, ensuring that the botanical and topographical elements of a property receive the same rigorous protections as its brick and mortar.
State Registry Classifications
California Historical Landmarks
Properties of statewide historical importance. For a landscape to achieve this status, it must be the first, last, only, or most significant of its type in the state. Alterations to these landscapes require exhaustive Environmental Impact Reports (EIR) and the approval of the State Historical Resources Commission.
Points of Historical Interest
Properties of local or countywide significance. While less legally restrictive than Landmark status, registering a garden or park as a Point of Interest establishes a vital municipal record, forcing local planning commissions to formally address the landscape's heritage during zoning disputes.
HALSCA partners with local historical societies to transition vulnerable "Points of Interest" into fully surveyed, CEQA-protected entries within the CHRIS database, utilizing our exacting botanical and structural documentation as the primary evidentiary basis for state registration.