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SEC. 4. RELATION TO CITY PLANNING CODE. (a) Article 10 of the City Planning Code is the basic law governing historic preservation in the City and County of San Francisco. This ordinance, being a specific application of Article 10, is both subject to and in addition to the provisions thereof. (b) Except as may be specifically provided to the contrary in this ordinance, nothing in this ordinance shall supersede, impair or modify any City Planning Code provisions applicable to property in the Alamo Square Historic District, including but not limited to existing and future regulations controlling uses, height, bulk, lot coverage, floor area ratio, required open space, off-street parking and signs. (Added Ord. 324-84, App. 7/6/84) SEC. 5. STATEMENT OF SIGNIFICANCE. The Alamo Square Historic District is significant as a continuum of distinguished residential architecture by distinguished architects spanning the period from the 1870's to the 1920's. The towered Westerfield House, the renowned "Postcard Row" with its background of the downtown skyline, and the neighboring streetscapes are as identified worldwide with San Francisco as the cable cars and Coit Tower. With a variety of architectural styles, the District is unified in its residential character, relatively small scale, construction type, materials (principally wood), intense ornamentation (especially at entry and cornice), and use of basements and retaining walls to