Wireless communications facilities located on property owned, leased, or otherwise controlled by the Borough shall be a permitted use in all zoning districts, provided that a license or lease authorizing such facilities has been approved by the Borough, and, as a condition of any such license or lease, the Borough may require site plan approval or may exempt the applicant from approval. The decision to extend such license or lease to an applicant shall be vested solely with the Borough, and shall not be governed by this section. The Borough, in its absolute and sole discretion, reserves the express right to deny all use of its property for wireless communications facilities. Nothing in this section shall be construed as requiring any applicant to locate on property owned, leased, or otherwise controlled by the Borough. Preexisting wireless communications facilities are exempt from the application of this subsection.