All zoning devices (variances, use permits, precise plans, and similar exceptions or approvals) heretofore granted by the city or county shall remain in full force and effect under conditions and terms or time periods applicable thereto. Notwithstanding any other provision of this title, no use authorized by such previously granted zoning device, which is being lawfully exercised in compliance with all conditions of approval imposed upon the authorizing zoning device, shall be deemed to be nonconforming, for any purpose, except as herein specifically set forth. If, as of the effective date of this title, pursuant to the provisions of the former zoning regulations of the city, legislative or administrative action is pending, such action shall be deemed to have been taken pursuant to the provisions of this title, and shall be finally processed, insofar as possible, in accordance with the provisions hereof.

The city manager shall designate the officer or officers who shall enforce the provisions hereof.

The effective date of each of the regulations contained in this title shall be deemed to be the operative date of the city council ordinance which adopted such regulation, unless a later date is specified in a particular regulation.

The regulations contained in this title, shall not apply to city-owned or leased property, when actually in use by the city.

The following zones are established within the city to carry out the purpose of this title:

R-1 Low Density Residential Zone

R-2 Medium Density Residential Zone

R-3 High Density Residential Zone

R-4 Very High Density Residential Zone

HR-C Hillside Conservation Zone

HR-LD Low Density Hillside Preservation Zone

HR-MD Medium Density Hillside Preservation Zone

HR-RE Rural Estates Zone

HR-VL Very Low Density Zone

PC Planned Community Zone

C-1 Neighborhood Commercial Zone

C-2 General Commercial Zone

BP Business Park Zone

CO Commercial Office Zone

CM Commercial Manufacturing Zone

OS Open Space Zone

PF Public Facilities Zone

I-HC Institutional-Healthcare Zone

H Hillside Development Overlay District

FP Flood Plain Overlay District

HM Historic Mission Overlay District

PD Planned Development Overlay District

GH Geologic Hazards Overlay District

Changes in the boundaries of any such zones may and shall be made by ordinance. Where uncertainty exists as to the boundaries of any zone shown upon the Zoning Map, the rules set forth in Section 17.04.070 through 17.04.090 shall apply.

Where such boundaries are indicated as approximately following center of street and alley lines or lot lines, such lines shall be construed to be such boundaries.

In the case of unsubdivided property where a zone boundary divides a lot, the location of such boundaries, unless the same are indicated by dimensions, shall be determined by the use of the scale appearing on the zoning map.

Where a public street or alley is officially vacated or abandoned, the regulations applicable to abutting property shall apply to such vacated or abandoned street or alley.

There is adopted an "official zoning map" for the city, a true copy of which is marked as such and incorporated in this title by this reference. All properties within the city are placed in the zones as indicated on said map. Said map shall remain on file in the office of the city clerk of the city. All changes to said map shall be noted thereon by the city clerk as soon as the same become effective.

All uses not specifically permitted, permitted subject to a conditional use permit, or provided for by interpretation of the enforcement officer or city council shall be prohibited. A variance as provided for in Sections 17.30.030 through 17.30.060 shall not be construed as a zoning device to allow or permit a prohibited use.