The most expensive home sold for $10.4 million near Embassy Row.

You’ll never afford to live in any of them. Probably.

It may not be quite as sexy as the X Prize or the Netflix prize, but MRIS, which is the listing provider for D.C. and quite a bit of the mid-Atlantic region has announced a MRIS Innovation contest to develop a local real estate app, with a grand prize of $25,000.