CADILLAC â Tree-lined streets cool sidewalks and clean the air. So notes Kevin Sayers, urban and community forestry specialist with the Michigan Department of Natural Resources as the department, in partnership with the Arbor Day Foundation, announced which Michigan communities earned Tree City USA designations. Cadillac was one of the 124 communities in Michigan to earn the award. âThis will be 38 years in a row,â said Mike Coy, Cadillacâs zoning administrator who handles a city program that gives away trees. The program is âa maybeâ this year, Coy said, due a funding issue. âLast year one of the tree grant funding sources weâve been successful with did not offer a program for us to apply through,â Coy said in an email.