Do away with zoning laws that mandate minimum house sizes.
Employers can increase remote work opportunities so people can move away from cities and to where the underused housing is.
Interesting thought on zoning. (Shameless plug alert) my son works for Texas Public Policy Foundation, a conservative think tank, and just published a couple of articles on that very topic. Che was comparing Houston ( no zoning) and Dallas that has very strict zoning ordinances on minimum lot size and how that impacts median house cost.