interested...the $200 is incorrect and skews your analysis. Don't know if you're talking about Scarborough! I'm just talking about the Yonge corridor around Bloor. I was in 18 Yorkville around 2002 or so and it was well over $300 sq ft. Prices were fairly flat for a while there. In 2005, CASA opened around $375 sq ft.
I bought on paper in 2001 summer for $175-180/sq. ft in downtown.(University/Richmond area). Yorkville was more expensive and 18 Yorkville was expensive at the time (which i believe was late 2002 or in 2003). But let's agree to split the difference and say it was $250/sq. ft. for downtown (not Yorkville). It makes it a 4 fold increase as opposed to 5 fold. Still very hefty.