(a) A PD district shall be comprised only of contiguous lands forming a single, cohesive area to be developed as a unit, either at one time or in phases. No PD district may surround an island of land not included as part of the PD district.
(b) No PD district shall be established unless all owners of freehold estates in the lands included within the proposed PD district have given their consent, in writing, to the establishment of the proposed PD district and to their lands being made subject to the PD Ordinance to be adopted by the City Commission and to the terms of the Master Development Plan related thereto and unless all such owners have provided all legally binding instruments the City Commission finds are necessary to the enforcement of long term obligations imposed under the said PD Ordinance and Master Development Plan.