Chapter 18.2.5 – Standards for Residential Zones Search within This This chapter is included in your selections. Sections: 18.2.5.010 Purpose. 18.2.5.020 Applicability. 18.2.5.030 Unified Standards for Residential Zones. 18.2.5.040 Accessory Buildings and Structures. 18.2.5.050 Affordable Housing Standards. 18.2.5.060 Yard Exceptions. 18.2.5.070 Maximum Permitted Residential Floor Area in Historic District. 18.2.5.080 Residential Density Calculation in R-2 and R-3 Zones. 18.2.5.090 Standards for Single-Family Dwellings.