Houston is the most populated city in the United States without zoning laws. City voters rejected creation of separate commercial and residential land-use districts in 1948, 1962 and 1993. As a result, Houston has grown in an unusual manner. Rather than a single “downtown” as the center of the city's employment, five additional business districts have grown throughout the inner-city, including one for Houston's medical center complex. If these business districts were combined, they would form the third largest downtown in the United States. The city also has one of the largest skylines in the United States but because it is spread over a few miles, pictures of the city show, for the most part, the main downtown area.