Located in the food court below the Sheraton on 7 and Leslie; go in from the mall entrance beside The Host, and just walk straight towards the back then you'll hit the food court.
This is my new favorite Thai food join in town, even though they've been around for quite some time. Portion is smaller than typical Markham food court , but for me it was just enough to have room for dessert after.
Lovely green curry with shrimp, the best khao soi that I've ever had. I will be going back often.