Do you know that there are properties in La Paz that can be rented for free? Yes, it's for free in effect, but there are conditions that have to be met.The general rule is to pay the landlord by at least a year's worth of rent (multiplied by a factor of three or four) so that he/she can invest it meaningfully. After that, the landlord will return your payment to you. You will be legally binded, so there's no need to worry about scams. Learn more about that process and more here in Escape Artist.
Link: La Paz, Bolivia - Live In The World's Highest Capital Rent Free