The UA is a bit different from the Michigan in this respect... the theatre is built behind the building whereas the theatre of the Michigan was partially underneath the office tower and important to the structural integrity of the building, therefore it couldn't be demolished... the UA theatre could actually be torn down without having any likely affects on the office tower.
On the note of the Tuller lot, any structure likely to be built, I suspect it would likely be built similar to that of the Book-Cadillac, with ground floor retail [[especially with the prospect of an arena nearby, regardless of whether or not that happens, another story entirely) and it would likely be built with the prospect of selling the "air-rights" above it because of the potential future value of the land where it is located on Grand Circus Park... obviously is isn't worth much now, but if there was ever an arena across Adams from the Tuller plot, this land would become much more valuable.
I am with you Lorax... One can hope!
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