The other side of this is that landlords hate to reduce rent to rent vacant spaces because their paying tenants will demand rent reductions or move. That can crash the rental market. A building half rented at rent X is more profitable than a building fully rented at rent 0.5 X.
[1] https://propmodo.com/the-end-of-extend-and-pretend/
[2] https://www.newyorkfed.org/research/staff_reports/sr1130