For his part, Brumm — who said he first heard of the Rainbow Mine cabin’s deconstruction from a friend this winter before checking it out himself this spring — sees the Forest Service’s “point with squatters habitating and fire danger.”

Source: https://www.summitdaily.com/news/a-historic-mining-cabin-stood-in-keystone-gulch-for-more-than-100-years-then-the-us-forest-service-took-it-down-without-formal-approval/

The extra space comes from maximising the cabin’s verticle volume.

Source: https://thenextweb.com/news/meet-the-finalists-of-the-tnw-valencia-startup-pitch-battle