Amends Section 6409(a) of the Middle Class Tax Relief and Job Creation Act of 2012 (47 U.S.C. 1455(a)) by replacing prior text in paragraph (1) and updating the subsection with new rules governing modification requests for existing wireless facilities.

Deemed approval: If a State or local government or instrumentality does not approve a submitted eligible facilities request or provide the required written determination within 60 days after submission, the request is deemed approved the day after that 60-day period.

If a government determines a request is not an eligible facilities request, it must provide a written notice to the requesting party that clearly explains why and cites the specific provision of the subsection or the regulations relied upon.

Tolling for incompleteness — initial submission: If, within 30 days after submission, the government notifies the requesting party that required information was not submitted, the 60-day review timeframe is tolled until the requesting party submits a supplemental submission responding to that notice.

Tolling for incompleteness — supplemental submissions: If, within 10 days after a supplemental submission, the government notifies the requesting party that required information remains missing, the 60-day timeframe is further tolled until the requesting party files a subsequent supplemental submission responding to that notice.