Simcoe Street is apparently closed north of Front St (to a little south of Wellington) until 2023 for construction of a new PATH tunnel between Simcoe Place and 160 Front St West. East sidewalk closed. Two-way bicycle access will supposedly be maintained, see Attachment 1 and 2 at end of PDF linked below.

https://www.toronto.ca/legdocs/mmis/2021/te/bgrd/backgroundfile-167662.pdf