WeWork has signed a lease expansion at Alter’s 20 W. Kinzie building in River North, just one year after taking over much of the space vacated by tech giant Google. An Alter spokesperson tells GlobeSt.com that the shared workspace provider will also occupy the entire 16th floor, an extra 25,000 square feet, and now has a long-term lease at the property for a total of 129,000 square feet, making it the largest WeWork facility in Chicago.