AGTO
Banned
Can you provide a source or evidence of this? This does not sound like it would meet fire code, I have a hard time believing that a single stud wall is separating one suite from another. I'm quite sure that concrete or cinderblock walls are standard in Toronto highrise residences in at least the past 20 years. That said, noise can still travel through these materials.
How about you go and look at a new condo?
You can also look up the building codes yourself.
If you rather not, then you'll have to accept that 2 layers of 5/8" type X drywall provides a 1 hour fire rating, which is acceptable to the City of Torontos building code.
Since you're 'quite sure' that I'm wrong, how about providing some contrary evidence?