What is the test for establishing and maintaining a residential and quasiresidential district?

1 'A municipality has the power to establish and maintain residential and quasiresidential districts, and to exclude therefrom all non-conforming and conflicting uses. 12 Cal.Jur. 10-yr. Supp. 147, 8, and cases there cited.' City of Los Angeles v. Gage, 127 Cal.App.2d 442, 451, 274 P.2d 34, 38.

'Private agreements imposing restrictions are not to be considered when determining the validity of a zoning ordinance for the reason that such private agreements are immaterial.' O'Rourke v. Teeters, 63 Cal.App.2d 349, 352, 146 P.2d 983, 985.