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How many building areas in Sichuan do not need to be approved for civil air defense?

How many buildings in Sichuan with a building area of less than 500 square meters (including 500 square meters) do not need to apply for civil air defense approval? According to the relevant notice issued by the Department of Housing and Urban-Rural Development of Sichuan Province, housing construction and municipal infrastructure projects with an investment of less than 6,543.8+0,000 yuan (including 6,543.8+0,000 yuan) or a construction area of less than 500 square meters (including 500 square meters) in Sichuan Province are not allowed to apply for civil air defense approval.