Isn't that garage, Metropolitan Parking Solutions, at 116 Pearl, one of those guaranteed to be supported by COJ? Most likely, giving the city's penchant for giving, parking there would b part of the incentive to move downtown. The garage at 520 Forsyth is already owned and used by the tenants of El Ad so that's also a given.
Why would any of the new crowd of employees, wedded as most are to easy access to their cars, walk across the street, wait for a skyway car and travel to an outlying parking site? It's not likely that any parking will be free as before so the close by access will be the parking solution of choice.