If you’re maintaining a 100 year old building, it would be very easy for costs to exceed that cap.
Your building might be worth$2M, then a rent control law is passed and suddenly it’s worth $1.5M.
That is unless the $2m valuation is based on a speculative estimate of how much rents will go up in the near future?
I.e. enforce basic tenants' protection instead of worrying about what incentives landlords have. It shouldn't matter whether the landlord wants to take a unit off the market if the tenants aren't willing or can't move. Then it lies on the landlord to create an incentive for tenants to move out, for example by extracting less rent from uncontrolled units to make them more affordable.
Another good idea is for tenants to unionize and share the legal costs of e.g. questioning the legitimacy of a lease termination or challenging sub-standard living conditions.