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Zoning laws also contributed to the location of residential areas outside of the city center by creating wide areas or "zones" where only residential buildings were permitted. These suburban residences are built on larger lots of land than in the central city. For example, the lot size for a residence in Chicago is usually 125 feet (38 m) deep,[7] while the width can vary from 14 feet (4.3 m) wide for a row house to 45 feet (14 m) wide for a large stand–alone house.[citation needed] In the suburbs, where stand–alone houses are the rule, lots may be 85 feet (26 m) wide by 115 feet (35 m) deep, as in the Chicago suburb of Naperville.[citation needed] Manufacturing and commercial buildings were segregated in other areas of the city.