Just for the sake of completeness, the Tribune article which has different details. I'm sure someone who was able to attend will set the facts straight.
http://www.chicagotribune.com/news/l...,7108445.story
Developers give first glimpse of proposed complex at junction of Chicago River branches
By Blair Kamin
...The firm of New Haven, Conn. architect
Cesar Pelli has designed the office towers and has crafted a master plan which calls for 2.3 acres, more than half the site, to be open space. Up to 1,285 parking spaces would be in a three- or four-level deck tucked below street-level greenery. The open space would slope down to a 30-foot-wide riverwalk, as required by the city.
...
The Chicago firm of
bKL Architecture has designed the apartment building, a 500-footer, which the developers want to complete by fall of 2014. The building would be marketed to young professionals and would have about 500 units, with an average size of 750 square feet.
Rents would start at $2,000 per month for studios and go to $4,000 per month for two bedrooms, according to Van Schaack.
The developers said they
plan to request a zoning change that would allow them to build slightly higher towers, achieving a total square footage for all three buildings of more than 3.7 million square feet.
If that change were granted, the towers would be 950, 750 and 525 feet tall, said Hines' zoning laywer, Jack George.