^^ ok, this is what I did find:
Rent control policy in B.C. has become increasingly restrictive with successive governments. In the 1980’s the Bennett government allowed unlimited rent increases, with tenants only able to challenge rent increases above 15%. In the 1990’s the Clark government continued to not limit the amount of a rent increase, but required the landlord to justify increases in response to all tenant challenges. And in 2002, the Campbell government introduced the most stringent rent controls establishing limits on rent increases.
Now I don't have any stats to back this up, but it seems to me that the overall vast majority of apartment buildings were built in the 60s and 70s. I can't recall any apartment buildings built here in the 80s, 90s and 00s. Part of the reason I can see so many apartment buildings built during the 60s and 70s as that was when we had the baby boomer generation come of age and there was a huge demand for rental housing
I also seem to recall a time in the 90s when apartment vacancy was high and landlords were offering incentives to move in for a year and get 1 months free rent, but I forget the specifics. Obviously if demand was that poor then, that is also another reason why we didn't see a lot of apartment construction. I seem to recall when I rented in the 00s it was relatively easy to find good quality, reasonably priced rentals
Obviously those my personal observations, but anyone is free to tell their thoughts