Chapter 17.21 R-4 MULTIPLE-FAMILY RESIDENTIAL ZONE This chapter is included in your selections. Sections: 17.21.010 Permitted uses. 17.21.020 Conditional uses. 17.21.030 Lot size. 17.21.040 Yard requirements. 17.21.050 Building height. 17.21.060 Density requirements. 17.21.070 Signs. Recodified.