American Elm is fast growing, tall tree with a recognizable and pleasing shape.
It's well suited for urban environments because of its non-invasive roots and ability to grow on harsh sites (quite salt tolerant). American Elm develops a wide, dense canopy that provides shade for many city streets around North America.
Common Hackberry is a medium sized deciduous tree that is similar to the American Elm but resistant to Dutch Elm Disease. Will likely be the replacement tree for Elm in Canadian municipalities.