The Leo J. Ryan Federal Building is surrounded by a cyclone fence , and functions effectively as a bunker . The building itself is kept isolated - the federal government owns the property behind the building , and no other government tenants are near the facility . After the Oklahoma City bombing , where a federal building was destroyed by explosives , the federal government has taken care to isolate sensitive archived records and documents away from other government agencies . The building houses over 200 million records from 110 different United States federal agencies , as well as 10,000 records from federal courts of the Pacific Sierra region . Records staffers make over 100,000 photocopies per year . It would take 40 people approximately 100 years to microfilm all of the records currently available at the National Archives and Records Administration division of the Leo J. Ryan Federal Building
Oklahoma City bombing
Oklahoma City bombing
Leo J. Ryan Federal Building