Chapter 30.23A URBAN RESIDENTIAL DESIGN STANDARDS Search within This This chapter is included in your selections. Sections: 30.23A.010 Purpose. 30.23A.020 Applicability. 30.23A.030 Compatibility design standards. 30.23A.040 Detached single-family dwelling and duplex design standards. 30.23A.050 Single-family attached dwelling, mixed townhouse, and townhouse development design standards. 30.23A.060 Multifamily design standards. 30.23A.070 Building location and orientation. 30.23A.080 On-site recreation space. 30.23A.090 Landscaping. 30.23A.100 Administrative site plan review. 30.23A.110 Underground utilities.