With signs that Montreal's more than decadelong condominium boom could be fading, some local developers are repositioning or even pulling projects due to waning demand. In the downtown core, quarterly presales of new condos have averaged nine units per project this year, according to Altus Group Ltd. AIF.T 0.00% , a real-estate consultancy. That is well below the pace of such sales in both 2012 and 2011, when the average was 16 units. Meanwhile, only 10 new condo projects were announced in Canada's second-largest city in the first half of 2013, compared with 14 such projects in the first half of 2012. At the current pace, Montreal isn't likely to match the 25 project launches announced last year, and could fall below the 2011 total of 14 projects, Altus Group says. Units in Samcon's redesigned condo project will be about 10% smaller Samcon Developers have noticed. "There's starting to be a lot of uncertainty in the marketplace," said Sam Scalia, chief...