Earlier quoted context omitted.
What specific government policy is causing developers to only build $2k+/mo rentals? You can't just vaguely say "government" is at fault without connecting the dots. This seems more like the market's fault. If homes in a particular area are going for $2k/mo, then that's what they are going for. If this is the government's fault, are you proposing price controls?
Zoning and building codes drive up the cost of new construction. The inventory of buildable properties in cities is artificially scarce due to zoning restrictions, and that scarcity drives up the base cost per square foot. Even with land in hand, you can’t build just anything without meeting an insane number of code requirements, all of which add real costs that drive up the minimum rent amount necessary to provide a…
Zoning laws like single family zoning, requiring parking spots for every unit or even every bedroom, disallowing zero lot lines on lots that allow multiple units. All of these things add cost that may not pass along any value to people in the market.
Aside from the engineering complexities of modern buildings, we've also limited ourselves to building either single family or 200 unit apartments when most cities have a ton of space for 3/4 unit homes which are considerably cheaper to construct. We built our zoning laws on the idea that we could just always expand outward into suburbs forever. But that approach is broken as people start to move back into cities.