You're no longer saying "owner", we're making progress.
Now do tell us : if the combined revenue and appreciation of assets are not greater in value than the expenses (eg mortgages, services, taxes, opportunity cost), what point is there to being a landlord?
(This is a trick question, by the way)
Actually, you could rent out at a deficit, and still come out winning. I'm sorry but that was a trick question.
Tank the loss using personal income. Do this for a couple of years, and you have built enough equity on your homes to act as security for another mortgage. Now you have two renters paying you every month. Rinse, repeat.
Real estate is the safest investment, bar none. Do you want me to walk you through the implications of that?