New York City is full of aging buildings that have suffered the vagaries of time, erosion and gravity. Many of these structures have historical significance and/or are on Landmarked or National Register sites which has spurred a flurry of architectural preservation, restoration and evaluation of historic architecture.

Preservation efforts — from restoration (a process that retains and repairs materials from the most significant time in a property’s history) to localized repairs, which might include improving water tightness around the building has become a booming business. The challenge of blending old and new architecture to ensure that the historic integrity of an old building is maintained has become an art form.