In interpreting and applying the provisions of this chapter, they shall be held to be minimum requirements for the promotion of the public safety, health, convenience, comfort, prosperity, or general welfare. It is not intended by this chapter to interfere with or abrogate or annul any easements, covenants, or other agreement between parties; provided, however, that where this chapter imposes a greater restriction or higher standard upon the use of a building or premises or upon heights of buildings, or requires larger streets or open spaces than are imposed or required by other ordinances, regulations or statutes, or by easements, covenants, or agreements, the provisions of this chapter shall govern.