The Bay Street project (CIBC Square) involves the construction of two new commercial buildings, joined by a one-acre elevated park over the rail corridor near Union Station. A key component of the construction is the new Union Station Bus Terminal. Construction got underway on the terminal in 2017. The terminal will provide connections for users of the rail and bus networks.
In March 2020, a modified site plan for the second building, 141 Bay Street, which will include accommodation for the potential future LRT along the Bay Street corridor. The new Union Station Bus Terminal was delivered by Metrolinx as part of the GO Expansion Early Works program.