(a) This Article shall apply to all conservation and preservation agreements falling within its terms and conditions.
(b) This Article shall not be construed to make unenforceable any restriction, easement, covenant or condition which does not comply with the requirements of this Article.
(c) This Article shall not be construed to diminish the powers of any public entity, agency, or instrumentality to acquire by purchase, gift, devise, inheritance, eminent domain or otherwise and to use property of any kind for public purposes.