What particularly interests me about this graph is that AAA is at pre-pandemic levels, A has a long way to go, B is increasing in vacancy, and C is decreasing.
My theory is that the flight to quality conversation is ruling the day with occupiers - the primary lure to get employees back to office. Prox to Union, pleasant, modern office spaces etc all being large draws. A and C class is likely driven by occupiers choosing a satellite office model, opening smaller offices in suburban parts of town for the employees who have relocated to the wider Golden Horseshoe since 2020. Long story short: It's ALL about attracting employees back to office. Whoever has the right strategy remains to be seen.
That all said: the pre-pandemic office market was an occupancy crisis. Manhattan's office market sat pretty at 10-20% vacancy for the past century, even through major business cycle downswings. The Toronto market is truly an outlier.
What does this mean for the HUB? Class AAA, A, and even C are all well-within what is a healthy development environment for new builds. While this development might change from what's proposed, I believe there's strong precedence/ability for the market to absorb it if it was built as-proposed today. Anchor tenant is a major hurdle, as is the ongoing unprecedented trade war and re-shoring of jobs by American megacorps that previously would have nearshored to Canada.