Cities, which were previously facing population decreases due to urban sprawl, are now facing an urban resurgence or revitalization. Millennials and retirees have found a home in many of the urban centers of America. In 2010, 83.7% of people in the United States and Puerto Rico lived in metropolitan area and a 10.8% growth in metropolitan areas from 2000-2010. However, with a large number of people living in the suburbs in previous decades, cities have not updated their neighborhoods to fit the needs and desires of its new residents. One of the tools to meet this need is a Business Improvement District (BID)
Business Improvement Districts are areas inside a municipality created for the purpose of developing, redeveloping, or maintaining a business area. New Orleans was the first city in the United States to implement a BID, and it saw great success.  There are now more than 1,200 BIDs nationally. In 1984, Wisconsin created its BID statute.  There currently 34 active BIDs within the city of Milwaukee. 
One of the unique aspects of a BID is that it requires that one business owner in this area to come forward with a petition for the BID. The planning commission designs its special assessment method and the implementation of the collected funds. If the owners of at least 40% of land value inside the BID raise an objection, it is vetoed. If the landowners do not veto the plan, then it then goes through the city legislative process and the mayor can approve it. The BID members have to renew the BID on an annual basis, unless there is an outstanding debt.