If business could knock down single family homes that were built 100 years ago when the city was 10% the size and put in modern medium or high density apartments the issue would resolve itself.
We need a land tax or the government to just outright buy huge acres of land and demolish it and build public transport.
The root cause of this issue is not landlords its land hoarders, whether it is the family who doesn’t want housing built next to them or the real estate company who wants to keep supply constrained. There are more regular people causing this issue than landlords or corporations. No one wants an actual solution to the problem people just bitch.
Although landlord rules do need improving. Things like being able to rent out a mouldy house should be jail time for repeat offenders. But currently it’s nothing.