Los Angeles created the first municipal zoning ordinance in the United States. On September 14, 1908, Los Angeles City Council promulgated residential and industrial land use zones. The new ordinance established three residential zones of a single type, where industrial uses were prohibited. The proscriptions included barns, lumber yards, and any industrial land use employing machine-powered equipment. These laws were enforced against industrial properties after-the-fact. These prohibitions were in addition to existing activities which were already regulated as nuisances. These included explosives warehousing, gas works, oil-drilling, slaughterhouses, and tanneries. Los Angeles City Council also designated seven industrial zones within the city. However, between 1908 and 1915, Los Angeles City Council created various exceptions to the broad proscriptions which applied to these three residential zones, and as a consequence, some industrial uses emerged within them. There are two differences from the 1908 Residence District Ordinance and later zoning laws in the United States. First, the 1908 laws did not establish a comprehensive zoning map as the 1916 New York City Zoning Ordinance did. Second, the residential zones did not distinguish types of housing: it treated apartments, hotels, and detached-single-family housing equally.