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.