This chapter shall not be deemed to affect in any
manner whatsoever any easements, covenants or other agreements between
parties; provided, however, that where this chapter imposes a greater
or lesser restriction upon the use of buildings or land or upon the
erection, construction, establishment, movement, alteration or enlargement
of buildings than are imposed by other laws, rules, regulations, licenses,
certificates or other authorizations or by easements, covenants or
agreements, the more restrictive requirements shall prevail.