In their interpretation and application, the provisions of this chapter shall be held to be the minimum, adopted for the promotion of the public health, safety, comfort, convenience and general welfare. Except where specifically provided to the contrary, it is not intended by the chapter to repeal, abrogate, annul or in any way to impair or interfere with any rules, regulations or permits previously adopted or issued or which shall be adopted or issued pursuant to law relating to the use of buildings, structures, shelter or premises; nor is it intended by this chapter to interfere with or abrogate or annul any easements, covenants or other agreements between parties; provided, however, that where this chapter imposes a greater restriction upon the use of a building or premises or requires larger open spaces than are imposed or required by any other statute, local law, rule, regulation or permit or by an easement or agreement, the provisions of this chapter shall control.