The City of Ann Arbor created the Ann Arbor DDA (Ordinance No. 14-82) in 1982 and renewed it in 2003 with a substantial amendment to its original Development Plan. Over its history, the DDA has been a significant and influential catalyst for the revitalization and renewal of downtown Ann Arbor. The Ann Arbor Downtown Development District encompasses all or part of 66 city blocks, or approximately 271 acres, of which 80 acres are public rights-of-way.