The clean up and development of polluted riverfront property in downtown Minneapolis is picking up steam. The area is part of the city's historic flour milling district. Developers are building apartments and townhomes for people they believe will be attracted by the central riverfront's scenery and location. Minnesota Public Radio's Dan Olson reports. audio . . . sfx wrecking ball Right now the neighbors are a little noisy. But the wrecking crew tearing down the old General Mills grain silos will leave soon. Then, developer Peggy Lucas' customers can catch a glimpse of what they've bought - an unobstructed view of the Mississippi River. Lucas' company, Brighton Development, is building apartments in the historic North Star Blanket fa