Murals may only be placed directly on unimproved concrete, concrete block or unattractive brick facades, and wooden siding. The installation of murals over walls that do not hold paint would not be allowed (example: painting vinyl siding or other non-porous surface). However, should the applicant desire to have a mural constructed off-site in movable panels to be installed on said facade, the attachment of said panels must comply with the applicable building codes, subject to required permits and inspection; must not cover window or door openings unless properly sealed in compliance with applicable building codes, the attachment devices must not compromise the structural integrity of the surface to which the panels are attached, and said panels must be securely attached to prevent failure due to weather conditions, vandalism or age.