1. Those which are allowed in the underlying zone designation provided the proposed development has been reviewed and stamped by a competent registered professional engineer or architect. All requirements and standards for the underlying zone designation shall be met. In addition, lands that are determined to be unsuitable to develop may be used for computation of density allowances.

2. Areas designated as flood hazard areas by the Federal Emergency Management Agency (FEMA) may be developed only in accord with the U.S. Department of Housing and Urban Development standards for flood hazard areas.