The general terms and conditions on which preliminary approval was granted shall not be changed, including but not limited to, use requirements; layout and design standards for streets, curbs and sidewalks; lot size; yard dimensions and off-tract improvements.

The applicant may submit for final approval on or before the expiration date of preliminary approval, the whole or a section or sections of the preliminary plat or plan.

The applicant may apply for and the Board may grant extensions on such preliminary approval for additional periods of at least one year, but not to exceed a total extension period of five years, provided that if the design standards have been revised by ordinance, such revised standards may govern.