Be it enacted by the Senate and House of Representatives in General Court assembled, and by the authority of the same, as follows:

SECTION 1. Notwithstanding paragraph (c) of clause Third of section 5 of chapter 59 of the General Laws or any other general or special law to the contrary, the personal and real property of a charitable organization, which property was acquired before 1911, located in the town of Belmont and providing treatment of mental diseases or mental disorders, shall be exempt from taxation if such property qualifies as exempt pursuant to the first paragraph of said clause Third.

SECTION 2. Notwithstanding the provisions of any general or special law to the contrary, the taxation of the real property described within a certain agreement entered into between the town of Belmont and the McLean Hospital Corporation dated November 22, 1999 shall be governed by said agreement.

SECTION 3. This act shall take effect upon its passage.