No idea, but I have wondered about that myself. My guess is it has something to do with WAVE, the deep water cooling infrastructure that heats and cools many of the downtown bank towers. I'd like to know as well...
June 27, 2020
Nearing completion of the City Park Pavilion building just inside the main entrance to TTP at the foot of Leslie Street.
Public washrooms
May 9, 2020
Using binoculars, I spotted a brave steelworker on the east side near the top precariously straddling one of the open steel beams. I have to tip my hat to these guys....Apologies for the poor clarity on my digitally zoomed images below.