It was the old Masonic Temple. After digging through ye olde BuildingsofDetroit.com archives, I've found a couple images.

You can see the old Masonic here:

http://i215.photobucket.com/albums/c...gs/masonic.jpg

and here:
http://i215.photobucket.com/albums/c.../masonic-1.jpg

and the demolition can be seen here: http://i215.photobucket.com/albums/c...ngs/masons.jpg

Note the top of the Fort Shelby in the upper left and the Mercer Building [[home to the Anchor Bar today) in the bottom left.