Maybe I'm reading your comment wrong but that would make it even harder to find a place to rent. Owners will stop renting if they fear to lose their property if a tenant remains for more than say a year. You need to regulate the amount of time you can AirBnB a place before facing a fine. Ideally you would earn 300$ for putting your place on AirBnB for two months or 700$ for renting it a year. (Simple numbers just an example). And we would still have the stagnant salaries and sky high property values that no one can afford problems.