Art and architectural elements having the purpose of beautifying and enriching public places rather than private spaces, whether or not the works are also functional. For art undertaken in conjunction with particular communities, usually to produce an effect or inspire response specifically within those communities, use "community art." For art associated with urban design, planning, and preservation, use "municipal art."

Source: Art & Architecture Thesaurus

http://vocab.getty.edu/page/aat/300056501