In their interpretation and application, the provisions of this
chapter shall be held to be the minimum requirements adopted for the
promotion of public health, safety, comfort, convenience and general
welfare. It is not intended by this chapter to repeal, abrogate, annul
or in any way impair or interfere with any existing provision of law
or ordinance or 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 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 buildings or
premises or upon the height of building or requires larger yards,
courts or other open spaces than are imposed or required by such existing
provision of law or ordinance or by such rules, regulations or permits
or by such easements, covenants or agreements, the provisions of this
chapter shall control.