Thornheights is a new townhouse development by A1 Development. A site plan has been proposed for 8 townhomes within the affluent Thornhill neighbourhood. Thornheights is also nearby Uplands Golf & Ski Club and The Thornhill Club, convenient access to Express Toll Route and Hwy 7, as well as the proposed future extension of the TTC subway system along Yonge street. The project is estimated to be completed on 2024 and will be located in 16 Kirk Drive in Markham.