Where abouts does it work currently and do you have any data to support this? I'm genuinely curious. Also don't forget about renters keeping tennancies vacant

Where abouts does it work currently and do you have any data to support this? I'm genuinely curious. Also don't forget about renters keeping tennancies vacant temporarily, to avoid losing their locked in rent control rate. I have heard many stories of affluent people keeping a "cheap" apartment in New York vacant for years on end.