It is more likely that IH knows the rental market price and you don't. 5% growth per year is totally normal in desirable areas . It's lower than real estate appreciation.
I don't think so? First, if that were true they wouldn't be significantly higher than other houses in the neighborhood consistently across many neighborhoods. Also, In 15 years of renting I've never had a guaranteed rent raise - ever. Rent only rose when the market made a raise make sense. Guaranteed regardless of the market is not normal in residential renting in my area.
