Passive solar, urban live/work, relatively small space design

Architect Alan Cohen’s dream house is efficient with space; he packs he packs 4,000 square feet of multi-use building- office (1050 sq ft), home (1730 sq ft), art studio for his wife and garage- onto a 3,750 square foot lot. It’s also very energy efficient; Cohen uses passive solar for heating and cooling his home, complete with industrial fans, venting windows, well-designed holes in the floor (between floors) for air flow and first floor concrete floors for thermal storage. Original story here: http://fa