Thirty per cent of households with children in Toronto live in mid- or highrise buildings. Downtown it’s 66 per cent. In fact, the number of families with children and teens living in highrise buildings grew by 10,000 or 15 per cent between 2006 and 2011. Yet the average size of a re-sale condo has dropped 20 per cent —1,087 sq. ft. to about 885 sq. ft. between 1996 and 2014. The city of Toronto has...