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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 the ordinance, nothing in this ordinance shall supersede, impair or modify any City Planning Code provisions applicable to property in the Northeast Waterfront Historic District, including but not limited to existing and future regulations controlling uses, height, bulk coverage, floor area ratio, required open space, off-street parking and signs. (Added Ord. 171-83, App. 4/8/83) SEC. 5. STATEMENT OF SIGNIFICANCE. (a) History of the Area. The Northeast Waterfront District contains commercial warehouse buildings from nearly every decade of San Francisco's history. The area reflects the waterfront storage and maritime activities which, until recently, were an important aspect of San Francisco business history. These buildings range in age from the early clipper ship warehouses of Scotsman Daniel Gibb in the 1850's to the properties owned by the General Engineering and Drydock Co., a company crucial to the shipbuilding effort that made San Francisco Bay the major Pacific maritime support facility during World War II. The original shoreline of Yerba Bue