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Behind the main house is the barn, where Paul builds furniture and works on cars

How about a customized barn to house that prized classic car collection. Barn Pros can set you up with a wide variety of packages including everything from blueprints (you could pay up to $30,000 for those alone) to lumber and hardware, ready to build—the only materials not included are nails, concrete, and the final layer of roofing.

Another view of the garage reveals its extensive space to house vehicles and protect them from the elements.

The fleet includes a ruby-red Renault Dauphine and a black Citroën Traction Avant.

What Carstensen saved on labor costs he was able to put into furnishings. The interior of the screened-in porch is outfitted with a mix of furnishings, both vintage and new. He purchased the vintage Malm fireplace in Los Angeles on a work trip and had it shipped to Portland. The rug, shelf unit, and loveseat are all from the locally-based Schoolhouse Electric, as are the ceiling lights: Factory Light No. 7 in Green.

A Tesla battery ensures the home performs well—and allows it to pump excess green energy back into the grid.