While Rossdale is an older neighbourhood with residential development beginning during the early years of Edmonton's history, there has been a significant redevelopment of the area in more recent years.
According to the 2001 federal census, only one residence in ten (9.9%) in modern Rossdale was built before the end of World War II. Another one in five residences (17.6%) were built between 1946 and 1970 and one residence in ten (11.0%) were built during the 1970s. One in four residences (24.2%) were built during the 1980s and two out of five (37.4%) were built during the 1990s.
The most common type of residence in Rossdale, according to the 2005 municipal census, is a mixture of rented apartments and apartment style condominiums. These account for half (51%) of all residences in the neighbourhood. Two out of three of these residences are in low-rise buildings with fewer than five stories while one in three are in high-rise buildings with five or more stories. Single-family dwellings account for one out of every three (35%) of all residences in the neighbourhood. Row houses account for one in ten residences (10%). Four percent of all residences are duplexes. Three out of every five (62%) are owner-occupied while two out of five (38%) are rented.
Additional neighborhood information here - https://www.edmonton.ca/residential_neighbourhoods/neighbourhoods/rossdale.aspx