(1) The overall average residential dwelling unit density for planned density development shall not exceed the maximum allowed density requirement of the underlying zone. The number of dwelling units shall be designated on each platted lot or combination thereof, forming a site, of the subdivision at the time of approval of the preliminary plat; and

(2) Site development within the designated areas may be constructed in phases; provided, however, that at no time shall the average density of that portion of the overall development with dwelling units thereon exceed the density of the underlying zone. [Ord. 3354 § 2, 1999; Code 1970 § 25.64.030.]