New additions should be designed and constructed so that the character-defining feautures of the historic building are not radically changed, obscured, damaged, or destroyed in the process of rehabilitaion. New design should always be clearly differentiated so that the addition does not appear to be part of the historic resource.
From the Secretary of the Interiors Standards
The Presidio is a National Historic Landmark with 469 historic structures. Historic building rehabilitation in the park must conform to Federal standards for the treatment of historic properties. These standards recognize that some buildings must be updated to remain usable and accessible. They require that new additions be compatible with, but not copies of, the historic architecture.
The right side of this fire station, built in 1917, was the first on any U.S. Army post to house a permanent fire company with trained firefighters. In 1998, the wing to the left was added to house larger fire engines. If you look closely, its design is distinguishable from that of the original building. Today it is staffed by the San Francisco Fire Department. Its paramedics are the first responders for the Presidio community and park visitors.
For an online experience of this exhibit visit www.presidio.gov