Located in Manhattan NY, this Brown Stone was taken down to the face of the building and completely re-built by Jonathan Chen Construction. The building is 4 levels. A 20 foot wide 10 foot high Portella steel bi-fold door unit was used in the great room located on the first level. The steel bi-fold unit in this rooms opens the space up to the outdoors expanding the use of the entertaining area. The natural light allowed in by the narrow sight lines of the steel bi-fold door, blurs the exterior to the interior making a seamless transition.