I don't quite understand your comments... the reason for I-375 and M-10 south of the I-75 interchanges was to move people in and out of downtown quickly [[either from the tunnel, or from downtown businesses)... and not based on any economic reasons??
To convert I-375 into a streetlevel boulevard will cost hundreds of millions of dollars... [[money that nobody has right now) and the amount of land that will be freed for other business uses is minimal [[and would likely not be cost effective). Also... I doubt that many folks would want any commercial activity on the east [[Lafayette Park) side of the "former freeway".
Also.. putting I-375 at ground level will just create another very intimidating roadway for pedestrians to cross... such as Jefferson between I-375 and M-10... and would do little to promote the integration of downtown and Lafayette Park.
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