In a U-4 General Office Building District, no building or premises, unless otherwise provided in this Zoning Code, shall be erected or used which is arranged, intended or designed to be used except for the following purposes, and as regulated by this Zoning Code:
(a) Professional, administrative, executive and showroom sales offices and banks or savings and loan.
(b) In a three-story building, as defined in this Zoning Code, the first floor may be used for retail stores and retail service uses as permitted in U-3 district, provided that no more than one-third of a building's gross space shall be devoted to retail use as measured by floor space or square footage, whichever permits less retail usage.
(Ord. 1991-31. Passed 6-13-91.)