Just read on Gringo Tree that the rule of thumb for rents in the US is 1% of the property value per month. (ie a$150000 home would rent for $1,500 per month). I don't know where that comes from! It certainly isn't St. Louis. In my building, properties worth $250,000 are renting for $1,500 per month. It's supply and demand. Real estate agents try to get what the market will bear. If Gringos will pay it, that's what it will be!