if in Vancouver, duplex lot is big advantage

but in Calgary, you need to find out the population forecast from Stats Canada to make sure the demanding for residential units will grow. Also you need to find out from city hall whether the lot is deplux or not. Based on the zoning by-law, big lot itself doesn't necessarily mean it is duplex. If both streets are small ones, corner lots have their advantage because the houses have more exposure to view(Image, if you have windows facing other hosues' wall, and comparing to windows facing streets) and Sun.