A developer is proposing a housing project to the city of San Francisco that's a bit outside of the box. The Kansas-based developer Chris Elsey of Elsey Partners, who runs the company with his twin brother, has plans to build two apartment buildings in San Francisco's Mission neighborhood, which will include 88 50-square-foot underground "sleeping pods" that are essentially bunk beds. The plans need to be approved by the San Francisco Planning Department before the developers can move forward to submitting a building application.