The Commission shall have the authority to disapprove any proposed use, building or structure or any change in an existing use, building or structure, which, in its opinion, would substantially affect the appearance and have a detrimental effect on the area under consideration. The Commission may require changes in the architectural treatment of buildings or structures and may require additional landscaping and development improvements. The Commission may impose such conditions of development as are necessary in its judgment to carry out the intent and purpose of the Design Zone.
('64 Code, § 49.06)