Chapter 17.63 NONCONFORMING USES This chapter is included in your selections. Sections: 17.63.010 Purpose. 17.63.020 Lots of record – Single-family dwelling construction permitted. 17.63.030 Structures – Alteration or extension. 17.63.040 Changes to conforming use only. 17.63.050 Use of structure – Discontinuance. 17.63.060 Structure – Destruction. 17.63.070 Time limit for completion.