Exempts from the leasehold excise tax all leasehold interests in the public or entertainment areas of an amphitheater if a private entity is responsible for one hundred percent of the cost of constructing the amphitheater which is not reimbursed by the public owner, both the public owner and the private lessee sponsor events at the facility on a regular basis, the lessee is responsible under the lease or agreement to operate and maintain the facility, and the amphitheater has a seating capacity of over seventeen thousand reserved and general admission seats and is in a county that had a population of over three hundred fifty thousand, but less than four hundred twenty-five thousand when the amphitheater first opened to the public.