Versatile passive house to balance livework urbancountry

Architect Alan Cohens dream house is efficient with space he packs 4000 square feet of multi-use building- office 1050 sq ft home 1730 sq ft an art studio for his wife and garage- onto a 3750 square foot lot.
Its 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 airflow and first-floor concrete floors for thermal storage. As an architect passionate about passive solar and urban livework design Alan Cohen got tired of waiting for a client to commission something that would test his green building skills so he built something for himself. He moved from a 3000 square foot home miles from his job to a multi-use property in downtown Healdsburg CA where he packed 4000 square feet of office 1050 sq ft home 1730 sq ft art studio for his wife and garage onto a 3750 square foot lot. His dream house is both efficient with space a 1730 sq ft home is about 23rds the size of the average home in the area and energy.
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 airflow and first-floor concrete floors for thermal storage. He also added plenty of common sense green design tricks hed learned during his several decades as an architect like adjustable awnings and an on-demand water heater.
On a more universal scale he used the structure of the building as finished materials: exposed steel joists 2x6s in floor using as an exposed ceiling below unpainted walls sheetrock mud mixed with sand and on the outside there is exposed brick and steel. In this video Cohen gives us a tour of his office home wifes art studio and backyard courtyard.
I tried to incorporate the things I learned over the years into this project.
Its not particularly exotic not a lot of fancy controls and its not overkill. On faircompanies: