To be fair, SF apartment rent doesn't include a 5000-foot runway.

Right. So it's a great deal. Even without the runway.

EDIT: So, a few of you get together and propose a skunkworks project to your employer. Move to Montana for five months and kick some ass.

SF apartment rent for a studio perhaps. This is a house, a hanger, offices, a runway, and some metalworking supplies. How much is that in SF?