City of San Antonio Office of Historic PreservationThe primary purpose of the Office of Historic Preservation is to preserve and protect the unique historic structures, archaeological sites, and design features of San Antonio. On August 10, 1967, City Council passed and approved an enabling ordinance that created the Board of Review for historic districts. The ordinance also set forth the rules and guidelines for creating historic districts, regulations for exterior changes to historic structures and sites, and the process concerning applications for permits.