This chapter shall apply to the new construction of residential dwellings in residential development projects totaling twenty (20) or more dwelling units in the standard single-family (R-1) zone and single-family alternative (R-1A) zone. If the residential development project includes more than one model or type of residential dwelling unit, then only one of the models or dwelling unit types shall be subject to the requirements of this chapter. (Ord. 2010-003 § 1)