Tenn. Code Ann. § 7-84-307

The governing body of the municipality is hereby authorized to levy, according to the benefits received, and to collect in such manner as the governing body may determine to be proper, annual service or maintenance fees against the properties located within the central business improvement district for the maintenance, upkeep, and repairs of all public properties located within such district, including, but not limited to, capital improvements, movable furniture or fixtures, and all trees, plants, and decorative plantings of each and every kind. Additionally, such fees may cover the cost of additional fire and police protection required for, or desired by, such central business improvement district and all operating expenses of such special facilities provided in the district as are not charged by the governing body against the general revenues of the municipality.