In order to carry out the purpose and provisions of this title, the city is divided into the following designated primary districts:

A.    R-1, single-family residence district;

B.    R-2, two-family residence district;

C.    R-T, townhouse residence district;

D.    R-3, medium density residence district;

E.    R-4, high density residence district;

F.    C-O, commercial-office district;

G.    C-1, neighborhood business district;

H.    C-2, general business district;

I.    C-M, commercial mix district;

J.    M-1, light manufacturing district;

K.    PF, public facilities district;

L.    OSC, open space-conservation district. (Ord. 38 § 1 (part), 1972: prior code § 10-403.010)

In addition to the primary districts, the following combining districts may be used in combination to modify the primary zoning where special circumstances in the nature of the property or proposed development exist:

A.    PD, planned development;

B.    X, future development;

C.    W, aquatic development. (Ord. 38 § 1 (part), 1972: prior code § 10-403.020)

Except as otherwise provided in this title, no structure shall be erected, reconstructed, enlarged, altered or moved, nor shall any building or land be used, except as hereinafter specifically provided and allowed in the districts in which such structure and land are located.

The districting regulations are as set forth in Chapters 17.12 through 17.40. (Ord. 38 § 1 (part), 1972: prior code § 10-404 (part))

The combining districts designated in Chapters 17.36 through 17.40 shall be used only in connection with one of the previously-established primary zoning districts. (Ord. 38 § 1 (part), 1972: prior code § 10-405 (part))