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?
You can’t built a “$2k rental”. You can only build a rental that someone will pay for. Landlords are building luxury housing because it’s the only thing that’s profitable right now due to the immensely ridiculous laws that don’t help people. But if an apartment building popped up in downtown SF charging $800/mo, it’s not like only the low income people would live there. Many people living in $3000/mo apartments also…
It's not supposed to saleable or rentable. But it does take up land that could be used for real housing. And it also drives up the perceived value - and price - of both rentals and outright buys.
Rent control may or may not be a solution. But many of these schemes are run through shady shell companies, and aggressive enforcement of financial reporting and taxation would go some way to fixing the problem.