It's artificially limited, but I don't think the number of housing units is necessarily how the limitation is imposed. You see, landlords aren't actually interested in tenants, they're interested in property values going up. Why? Because land and housing are legally considered capital, the value of which they can leverage for loans. That results in what we see happening in NYC and many other places, where apartments and retail spaces can lie vacant for years because the rent demanded by the owner is absurd, but to ask for less rent would lower the building's valuation. It's also why we have far more empty housing units than homeless people in this country, about 27 empty units for each homeless person. If these landlords were honestly participating in the market, or if housing wasn't considered capital, housing prices never would have gotten this high - and I suspect the same is true of the number of homeless.

The hyper-wealthy basically gave themselves a cheat code decades ago and have been abusing it to the detriment of markets and regular people ever since. We have a government body, the FTC, that's supposed to put a stop to this kind of market abuse, but the last time it really did its job at all was when it broke up Ma Bell forty years ago. For far too long it's been content to let corporations that are already far too big and have far too much influence over the market continue buying up their competitors or colluding to inflate bubbles.