Not trying to sound naiive, because I know development is going to happen out in this area of town, but why not downtown? Other cities that are similar in size to Grand Rapids have successful retail centers located in their downtown:
Louisville - Fourth Street Live
Salt Lake City - Gateway Center
Providence - Providence Place
Madison, WI - State Street
Norfolk - MacArthur Place
Also Spokane, Oklahoma City, Charleston, WV, Burlington, VT, and Bellevue, WA have large concentrations of retail in their downtowns.
Successful downtowns don't just rely on any one component, ie-office workers, restaurants, but blend all components into the mix.
Sorry for highjacking the thread, but it amazes me that with all the recent success in downtown, retail is still severely lagging behind. And the lame excuse that downtown retail is no longer feasible because of competition from the suburbs is wrong, based on the successful downtowns listed above.
Getting off my soap box, I will end my preachifying. Sorry for the long rant.