This chapter shall not be deemed to affect, in any manner whatsoever, any easements, covenants or other agreements between parties, except that, where it imposes a greater restriction upon the use of buildings or land or upon erection, construction, establishment, moving, alteration or enlargement of buildings than is imposed by such easements, covenants or agreements or by any public ordinance, rule, regulation, license, certificate or other authorization, the provisions of this chapter are intended to and shall prevail.