I think it is absolutely reasonable, considering the current market dynamics, to offer a price equal to mean value before the onset of bubble. So, take 1999 or 2000 base price and add a 5% yearly inflation and make an offer if you like the house. If the seller rejects it, you can walk away completely guilt free. Alternately, look up the most recent pre-bubble sale price on zillow and add a 5% p.a. rise.
