I own 15,000 houses': Robert Kiyosaki says
moneywise.com
moneywise.com
Right now the owner of a house can sell a house and get cash, which is worth X dollars a month when invested.
Or, they can choose to keep the house and rent it out. They will get Y dollars a month for rent, get Z dollars a month in appreciation, but pay P a month in taxes and maintenance.
They will choose to rent out the house if Y+Z-P>X.
If you double P (the property tax) then this equation becomes far less likely to be true. More people will sell their house to people looking to own a house, thus taking rental units off the market.