This is very interesting to me, because the median rent in Seattle just crossed $2K while the median condo price just reached $410K. Since you said your ignoring all the extras and just talking about payments after 20% down - that means with the current median 3.28% interest rate in Washington for 30 YR loan you would only be paying $1,433 a month way lower. Sounds like either your math is bad or you just have a good deal :)