The UDC establishes a range of base zoning districts. Residential districts run from lower to higher density, including RP (Resource Protection), RE (Residential Estate), the single-family R districts (R-20, R-6, R-5, R-4, R-3, R-2, R-1), the Residential Mixed districts (RM-6, RM-5, RM-4), and multi-family districts (MF-18, MF-25, MF-33, MF-40, MF-50, MF-65). Nonresidential districts include office (O-1, O-1.5, O-2), commercial (NC Neighborhood Commercial, C-1 Light Commercial, C-2 Commercial, C-3 General Commercial), the Downtown 'D' district, and industrial districts (L Light Industrial, I-1 General Industrial, I-2 Heavy Industrial).