All terms and conditions of special development districts granted by the Town Council or of variances and special exceptions granted by the Zoning Board of Appeals or any other conditions of approval granted prior to September 9, 1968, shall remain in force unless amended by any subsequent action under this chapter.

Except as hereafter stated, it is not intended by this chapter to repeal or in any way impair any existing provision of law or ordinance or any rule and regulation previously adopted or which shall be adopted, nor is it intended by this chapter to interfere with any covenants or other agreements between parties; provided, however, that where this chapter imposes a greater restriction upon the use of land and structures or any other larger requirements than are imposed by any provisions of law or ordinance or by any such rules and regulations or by any such covenants or other agreements, the provisions of this chapter shall hereafter prevail.