Johnhttps://www.cbc.ca/news/canada/toronto/toronto-multiplexes-housing-economics-1.6848643 ultimately yes this will lower housing costs. To, sort of, paraphrase Dickens. 100 bedrooms, 101 people bad. 100 bedrooms, 99 people good.
Toronto wants to increase density with multiplex housing, despite worries over affordabilty, logistics | CBC News
Housing advocates have welcomed Toronto's decision to allow construction of multiplexes, low-rise homes with multiple units, across city neighbourhoods. Yet questions remain as to how much new housing will actually emerge from this policy change and how affordable it will be.