"The functionality of all forms of property whether private or public will be the basis of determining the value of such property. Use of paint, dye, needle, or any other image-altering materials approved as safe by the city commission for purposes of art or expression (with the exception of hate speech), can be applied to all publicly visible property, both public and private, without penalty or infringement."

Wouldn't it be nice if there were smaller cities, not just good ole New York, NY that started a free graffiti art movement using a law like this one above?
but not if every building had graffiti, the values would be relative to other factors. Graffiti would just be another uncontrollable factor like the weather outside.