For the purposes of this article:
A scenic restriction shall be for an initial term of 10 years or more, and shall provide for either of the following:
A scenic restriction may not be terminated prior to the expiration of the initial term, and any extension thereof, except as provided for cancellation of contracts in Sections 51281, 51282, 51283 and 51283.3 of the Government Code, and subject to the provisions therein for payment of the cancellation fee.
Ca. Rev. and Tax. Code § 421