Any proposed cellular telecommunications antenna and related structures shall be designed, structurally, electrically and in all respects, to accommodate both, the applicant's antennas and comparable antennas for at least two additional users if the antenna is over 100 feet high. The antennas and related structures shall be designed for future rearrangement of antennas and to accept antennas mounted at varying heights. If the foregoing design for collocation requires additional antenna installation or beyond that permitted above, the Board, in determining the acceptable design, shall balance the benefits and probability of collocation against any detriments resulting from such additional antenna height.

The foregoing requirements shall also include a letter of commitment by the application, submitted prior to any approval by the Board, to lease excess space on the facility to other potential users at reasonable rental rates and on reasonable terms. The letter shall commit the owner of the antenna and related structures and equipment, as well as any successors in interest.