The pile driving for the downtown Milwaukee Marriott can be felt on the ground floor of a nearby building across the street. The $54 million project to build a 200-room, hotel is bringing heavy construction back into the heart of the city’s central business district. The construction is to be done for the hotel to open in late 2013. Construction work started out quietly, with crews doing cleanup and minor demo work on the interior of buildings facing North Milwaukee Street and East Wisconsin...