Comment by aaravchen

That's the problem, they don't care if people will buy or rent them. They literally just sit on them writing off any losses against other business units.

When enough institutional investors are all doing that same thing, the market suppply becomes restricted, especially in focused regional areas. It ends up indistinguishable from collusionary antitrust, though there's no actual communicated collusion so it's not technically illegal. In a normal situation like that, all it takes is a single participant to cave and drops prices to take advantage of the demand. But in this case the institutional investors can keep taking the losses indefinitely so no one ever feels the need or benefit to "break" first, and they can maintain it forever.