Newgeography.com:

Cities across America have invested enormous sums into  downtown redevelopment and major projects in selected districts.  The good news: these investments have shown  some ability to move the needle in terms of attracting young professionals  downtown.  The bad news lies with the  fact that these developments have been extremely costly, and have not  transformed the overall demographic or economic climates of the cities that  tried them.  This demonstrates the limits  of the policies. Those who aren’t in the  young professional, empty nester, or creative class demographic have rightly figured out that they are no longer the target market of city leadership. No surprise then that many of them have decided to vote with their feet.