Those factors normally considered are need for the adoption, the purpose, location, size, and physical characteristics of the land, and the character of the neighborhood. Also considered are the effect on the value of property, the amount by which property values are decreased, the motion of the general public, and the density, population, and aesthetics of the area. Traffic, use of nearby land, and length of time the property has been vacant are also relevant. An ordinance that is reasonable when enacted may prove to be unreasonable, and hence may be set aside by a court, if circumstances have changed. Zoning regulations must promote the good of all the people in the community rather than further the desires of a particular group, and the power cannot be invoked to further private interests that conflict with the rights of the public.
Restrictions based solely on race or occupancy of property within certain districts are invalid.
A classification that discriminates against a racial or religious group can only be upheld if the state demonstrates an overwhelming interest that can be served no other way. The regulation must be clear and specific. It must describe districts with certainty, and if maps are necessary, it should include references to them. The standards governing conduct of the administrator must be clear. The fact that regulations had not been enforced does not prevent their enforcement.