 The "old" City of Toronto is the business centre and is, by far, the most populous and dense part of the city.The "inner ring" suburbs of York and East York are older, middle-income and ethnically diverse areas.Much of the housing stock in these areas consists of old pre-war single-family houses, terraced houses, such as the uniquely Torontonian bay-and-gable housing style, and post-war high-rises.