The lease deal at 100 Summer St. follows Ironwood Pharmaceutical's separation of Cyclerion Therapeutics, Inc. on April 1, 2019.

The $253-million Arthaus condo tower will feature 108 units, more than 36,000 square feet of amenities, including a rooftop greenhouse, and more than 4,200 square feet of ground floor retail.

In the Second Annual Chicago Mid-Year CRE Sentiment Report produced by The Real Estate Center at DePaul University, approximately 52% of participants—down sharply from 69.8% a year ago—characterize the Chicago real estate market for the first half of 2019 as consistently strong.