Perhaps you could extract a few more of the Toronto-specific sites you found to be of interest.
***
Of the two you highlighted above.
One is the Canada Post facility on Lakeshore East.
To my understanding this site is now under utilized, but I'm not sure how much of that site's function remains and would need to be relocated.
Being directly across from the sewage plant may be an inhibitor to development, but maybe not.
Site is in the range of 9ha /23 acres
View attachment 568880
Limitations: Site is currently considered employment lands which it borders on both sides. I'm sure the City would be keen to see residential here.
Conversion to residential here, given the site size would demand new streets, probably 4 of them, 2, N-S and 2 E-W, but at minimum one of each.
Your height precedent would be the TAS proposal across Eastern at 12s. If this site went residential, it would obviously support many tall buildings. (potentially)
*****
Danforth Court is curious, I identify that as a group of low rise (3s) apartment buildings, which appear to be private, located between Main and Woodbine along Danforth.
Based on currently approved densities in the area, it seems unlikely to me that this land could be redeveloped cost effectively (you would have to replace the existing units); even if you went taller, say, 12-14s.......
I'm not sure I could make those numbers work, maybe.
Precedent is a brand new condo immediately adjacent at 10s, separation distances would play here.
The site is decent sized and has a laneway buffer to the south.
It runs something like ~36,000ft2
View attachment 568878
Streetview:
View attachment 568879