On December 6, 2017, Toronto City Council voted to establish a new property tax class for "Creative Co-Location Facilities". This is intended to provide some arts facilities (e.g. 401 Richmond, Artscape) in Toronto significant relief against property taxes pegged to market values, and to ensure that creative hubs are able to maintain their activity in vibrant and developing neighbourhoods. The new property tax class is in effect as of the 2018 taxation year. 

Read more here, here, here, and here.