Chapter 21.20 AFFORDABLE HOUSING This chapter is included in your selections. Sections: 21.20.010 Purpose. 21.20.020 Applicability. 21.20.030 General Requirements and Incentives. 21.20.040 Implementation Provisions. 21.20.050 Alternative Compliance Methods. 21.20.060 Supplemental Requirements. 21.20.070 Affordable Senior Housing. 21.20.080 Affordable Housing Agreement.