Interesting idea (as well as color scheme). I think though that there are too many houses on the market and too few people using your site. Focusing in one place would be good. Personally I would choose detroit, at least you then have a story to tell, you're trying to help out the country. Real-estate startup in seattle? Boring. What story is there about seattle real estate? People love a train wreck (Detroit), and you can leech off those eyeballs.