Other ordinances and private agreements. This chapter is not intended to interfere with, abrogate or annul any other ordinance, regulation or other provision of law, or any easement, covenant or other private agreement or legal relationship. When this chapter imposes restrictions on use or bulk different from those imposed by any other statute, ordinance, regulation or other provision of law, or by any easement, covenant or private agreement or legal relationship, whichever provisions are more restrictive or impose higher standards shall control.