20.400 ZONING DISTRICTS This division is included in your selections. Chapter 20.410 LOWER DENSITY RESIDENTIAL DISTRICTS This chapter is included in your selections. Sections: 20.410.010 Purpose. 20.410.020 List of Zoning Districts. 20.410.025 Lower Density Residential Zone Function and Location Criteria. 20.410.030 Uses. 20.410.040 Minimum and Maximum Densities. 20.410.050 Development Standards.