Make sure your getting your rental comps from a reliable source. I typically utilize several property management companies to bid the rents on a given property and knock off 1 to 2% before presenting the numbers to my clients. I also look at every property and run the numbers i.e. caprate, dscr, vacancy, reserves, depreciation, marketing, etc... It's a business so you have to work with a team that takes these factors into account especially being out of state.