Conflicting standards. 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 is imposed by other local
laws, rules, regulations, licenses, certificates or other authorizations
or by easements, covenants or agreements, the more restrictive requirements
shall prevail.