On and after July 1, 1995, any property which is subject to an agreement entered into by the Commissioner of Administrative Services for the purchase of such property through a long-term financing contract shall be exempt from taxation by the municipality in which such property is located, during the term of such contract. The assessed valuation of such property shall be included with the assessed valuation of state-owned land and buildings for purposes of determining the state grant in lieu of taxes under the provisions of § 12-18b.