Arlington House suffered significant damage in the 2011 Virginia earthquake, requiring the closure of the back halls and upper floor pending an architectural assessment. On July 17, 2014, philanthropist David Rubenstein donated $12.5 million to the National Park Foundation (the arm of the National Park Service which raises funds through private contributions) to rehabilitate Arlington House, its outbuildings, and grounds. The 30-month project is intended to restore the mansion, buildings, and grounds to the way they looked in 1860. The project will repair the earthquake-damaged foundation, and add new interior lighting and a modern climate-control system. National Park Service officials said they are likely to close Arlington House and the slave quarters for several months in 2016, during which most of the work will be done.