@woozle I think you’d need to multiply by the size of the rental somehow, either number of bedrooms (with minimum single/double room sizes) or just sheer floor area, while still complying with other hopefully existing regulations like number of bathrooms & kitchen space per occupant. Hopefully this avoids @codebyjeff’s objection.

It should also be possible to make and rent out a luxury place, though, somehow. Not sure how to make that work. How about everyone who wants to rent out a luxury, high priced place with <n> rooms needs to also have, nearby, <n> rooms available at the regulated price, times the integer ceiling of how many times over the regulated price the luxury place is?

You’d also need to do something about coding it by density; right in the city can’t be reasonably priced the same as the burbs or the country. @bennomatic‘s geographic ideas might fit in here.