An ECHO unit shall not be erected on any lot unless the lot area be at least 15,000 square feet. ECHO units shall in no case be erected within the front yard of the lot as elsewhere defined, and when erected in the side yard or rear yard, shall conform to all provisions of the Greenwich Township Zoning Ordinance establishing minimum side and rear yard setback requirements for principal structures for the zone district in which the lot is located, such that the outer walls of the ECHO unit shall be the prescribed distance from side or rear lot boundaries.