Michigan Avenue Tower II (@1400 S. Michigan) had a slow start to their retail, but it appears that their third retail space is going to be rented out based on the building permit on the window. The building permit says (in case you can't read it):
Interior renovation for a new pet grooming shop in existing 28 story, I-A building as per plan, not part of the condo association
The pet grooming shop joins Sanctuary and Waffles in the buildings retail space. That leaves only one vacant retail space in the building and it's probably the most high-profile space which is on the corner of 14th and Michigan.