Toronto’s current building boom has been realized largely with reinforced concrete as the building medium of choice. Some architects, developers, and academics, however, have been pushing for more sustainable building methods. In response, in 2015 the provincial government amended the Ontario Building Code to allow wood-frame structures as tall as six storeys. …two projects in Toronto are now well under construction using cross-laminated timber (CLT) …that greatly reduce the carbon footprint of buildings. Timber sequesters carbon and promotes the harvesting of a renewable resource. The engineered CLT members are incredibly strong, and fire resistant. In Liberty Village, construction is in full swing on 80 Atlantic Avenue, a five-storey, Quadrangle-designed office development from Hullmark. …In Bloor Yorkville, a three-storey project is being built with a CLT structural system at 728 Yonge Street, and is further along.