>> The solution(s) are pretty straight forward and I believe Vancouver already initiated a tax on not living in a residence. If the goal is affordability, those policies need to be increased as well as new building efforts (aka change zoning).

Wouldn't simply ONLY building new buildings/housing be more effective? This way, the wealthy can continue to purchase, but the investment would become worse and worse in returns and essentially provide subsidized housing to renters. This is somewhat the case in NYC where rents are far lower than ownership carry for identical units because the units are sometimes treated as stores of value.