The greenish upper cladding of Optima Chicago Center II. Kinda looks like the Chicago River.

Located at 220 East Illinois Street in Streeterville, Optima Chicago Center II will be a 54-story, 381-unit apartment tower. It was designed by Optima, Inc., and is being developed and built by Optima. because why pay a bunch of other companies to do the things you can do yourself? Its red and green glass will fit wonderfully beside its blue and black glass neighbor and predecessor, Optima Chicago Center.