Predominantly single family neighbourhoods in most older Canadian cities are chock a block with beautiful, well-proportioned 3-storey homes. Toronto & Montreal have many noteworthy examples. Many of these homes contain 2-4 separate suites but maintain the look and feel of a single detached home. An effective method for increasing density in a sensitive way, much like laneway housing, would be to relax building heights to allow for 3-storey homes. To ensure density is actually increased, require secondary suites on their own floor. 3 Storey duplexes could also be developed that include 2 main dwelling units and 2 secondary suites for a total of 4 units.