Mayday, fortunately, this is one of the few vacant buildings downtown that's actually half-way maintained for sitting as long as it has. It used to be home to many medical arts (as was the Broderick Tower across the street), and it won't take much to fill this up as it has been in temporary usage from time to time (i.e. using it as a hiring and training center, I believe, for the MGM Grand Detroit Casino).
A few more photos of the atrium arcade:
Southen -
http://www.flickr.com/photos/southen/
Southen -
http://www.flickr.com/photos/southen/
The murals during the SuperBowl at the base.
daveisnotmyname -http://www.flickr.com/photos/city_blocks/
Exterior
BuildingsOfDetroit -
http://www.flickr.com/photos/snweb/
Into the Park
UrbanTiki -
http://www.flickr.com/photos/urbantiki/
There is still hope for this one yet, and with the imminent renovation of the Broderick Tower across the street this "guard of Grand Circus Park" group will form a great gateway unto Lower Woodward, once again, not to mention it has a stop on the People Mover and that it has excellent views into Comerica Park.
Sorry about the quick hijack, Paradox.