447 86th Street
Brooklyn, NY
Madsen Engineering converted and extended two existing four-story buildings in Bay Ridge into one commercial space for a new Victoria’s Secret store. The existing floors and the interior masonry walls between the four buildings were removed during the gut renovation. New floors were built at new elevations. The existing exterior side masonry walls were preserved and connected to the new interior structural floors while the existing roof structure remained.
The ground floor structure is a composite concrete on metal deck slab supported by steel beams and columns and the upper floors consist of cement board flooring on light gauge joists supported by steel beams columns and new/existing masonry bearing walls. An extension was built in the rear yard, with new concrete masonry unit (CMU) bearing walls connected to the existing brick walls.
The building was retrofitted with a new lateral system. Madsen also provided design for temporary shoring and bracing of the existing structure during construction as well as work staging.