Each zone in §§ 20.00, 21.00 and 22.00 of this chapter is hereby overlaid with an additional planned zone named PR-(appropriate number) (appropriate district descriptive name) Planned Residential Overlay District, which may be considered for any land within the city. Zones contained in §§ 20.00, 21.00 and 22.00 of this chapter are hereby made underlying zones to be used for partial regulation of the rezoned tract. Each tract shall be at least 5,000 square feet in size. This zone shall be established in the same manner as all other zoning districts, but shall revert to the prior zoning classification without rezoning when special procedures as outlined in § 23.13 of this chapter are appropriate. As part of the application, the developer shall state the reason the Planned Overlay District is desired and why a regular zoning classification would not be appropriate. Nothing in this section shall be interpreted as waiving any portion of the city’s Building Code or standard specifications and standard drawings.