Stop in for a cup of coffee

I don't get housing prices.
Homes in the hood in Philadelphia are insane. It's driving the cost of homes in my neighborhood about 10 miles out to Double in the last two years.
Not complaing. Just where is the money coming from to buy them?
20% down on a $400K House???
WOW amazing how much it's gone up. Not gone up here too much not even close to that.