DDad is right, at least some of these parcels should be subdivided, if not by the city in its sales process, than by the acquiring purchaser through a motion in front of the zoning board. Any sort of organic redevelopment of downtown really requires us to move away from superblocks which, incidentally, require massive investments that few are positioned to take in Detroit.

The Hudson block should be split into two or four, at least. Though Hudson, the largest department store in the world, occupied that entire parcel, look around the the neighboring context to get some clue as to how that land should be used. Subdividing it won't stop big, bold signature developments from occuring-- if they otherwise would.