BTW, to give some background on the Monroe Block, here are some concepts and proposals (actually only the Cadillac Centre was a proposal) from the past:
Cadillac Centre
Northern Group, Inc.
Model D Media
Concept
AtDetroit.com
What used to be there (1968)
AtDetroit.net
What is there, today, as seen from the same spot, above.
Andrew Jameson
Never a really tall block (and didn't need to be), so whatever goes here will be taller than what was there before. This could really be huge in terms of filling in the streetwall, again.