The 3,700-square-foot space includes a rainwater collection system and heat pump, and thanks to the double-panel facade, is both well-insulated and energy efficient.  Photo 8 of 10 in Super Minimal Steel and Concrete Villa with an Unusual Facade

Super Minimal Steel and Concrete Villa with an Unusual Facade

8 of 10

The 3,700-square-foot space includes a rainwater collection system and heat pump, and thanks to the double-panel facade, is both well-insulated and energy efficient.