BMO Tower is the local headquarters for BMO Harris Bank, occupying a third of the 46-story office building. A five-foot-diameter sewer conveying drainage from the Jane Byrne Interchange bisects the site before outfalling into the Chicago River. Due to construction, future maintenance, and liability concerns, the client, IDOT, and CDOT agreed to reroute the sewer into public right-of-way. To avoid flooding under the office tower, we designed a new bulkhead for the tunnel which was installed five-feet east of the building footprint. In addition, we assisted with right-of-way acquisition along Canal Street to expand the building footprint. As a result, Canal Street changed from two-way traffic to northbound only, so we designed the new traffic signal and lane configurations in conjunction with CDOT and Bureau of Electricity.