Maintenance of Structures Containing Nonconforming Uses. The repair, maintenance, replacement, and aesthetic improvement of structures containing nonconforming uses which promote neighborhood enhancement, and which does not enlarge or expand the nonconforming use, as determined by the Director of Community Development shall be permitted and encouraged. Repair, maintenance, replacement and aesthetic improvements typically include painting, landscaping, paving, the replacement and addition of skylights, windows, doors, open spaces, and other features which promote the livability and usability of the structure and its compatibility with and enhancement to the neighborhood.