Concept Exterior And Interior Potrero House By Carl Bernstein. The renovation part was initiated with exterior, interior and landscape improvements followed by a third floor addition. The owners of Potrero House actually purchased an old cottage, which they wanted to turn into a comfortable living space. The only idea was to create a spacious dwelling which is functional, comfy and impressive, at the same time. Old cottage was originally built in 1904 and was more than 100 years old. The old construction resided on a triple wide lot, which took designer, Cary Bernstein to complete the project in two phases.