(363 P.2d 1063) HENRY G. FRANKEL, ET AL. v. CITY AND COUNTY OF DENVER, ET AL. No. 19,333.Supreme Court of Colorado. Decided July 31, 1961. Rehearing denied August 21, 1961. Action challenging validity of municipal zoning ordinance. Affirmed. 1. CONSTITUTIONAL LAW — Zoning Ordinance — Validity — Burden of Proof. The party attacking the constitutionality […]