Chapter 18.3.12 SITE DEVELOPMENT AND DESIGN OVERLAYS This chapter is included in your selections. Sections: 18.3.12.010 Purpose. 18.3.12.020 Applicability. 18.3.12.030 Detail Site Review Overlay. 18.3.12.040 Downtown Design Standards Overlay. 18.3.12.050 Historic District Overlay. 18.3.12.060 Pedestrian Place Overlay. 18.3.12.070 Transit Triangle Overlay.