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is a zoning concept that allows owners to build one or more sides of a structure on the property line.

is a common use of police power for the government to limit and control the uses of land.

All major American counties and cities have now adopted zoning ordinances (except Houston, the largest city in Texas and the fourth largest in America). Zoning ordinances specify the precise types of uses and activities permitted by the jurisdiction on each piece of land. Zoning categories commonly include residential, apartment, commercial, office and institutional, agricultural, and industrial.