The Aline Barnsdall Hollyhock House in the East Hollywood neighborhood of Los Angeles, California, was designed by Frank Lloyd Wright originally as a residence for oil heiress Aline Barnsdall (built, 1919–1921). The building is now the centerpiece of the city's Barnsdall Art Park. In July 2019, along with seven other buildings designed by Wright in the 20th century, it was added to the UNESCO World Heritage List. It is the first time modern American architecture has been recognized on the World Heritage List. The Hollyhock House is noted for developing an influential architectural aesthetic, which combined indoor and outdoor living spaces. History Aline Barnsdall originally intended the house to be part of an arts and live-theater complex on a property known as Olive Hill, but the larger project was never completed. This was Wright's second project in California (the first one being the George C. Stewart House, 1909, in Montecito). Atypically for Wright, he was not able to personally supervise much of the construction due to his preoccupation with designing the Imperial Hotel in Japan at the time. He delegated many of the responsibilities involved in completing the house to his assistant, Rudolph Schindler, and his son, Lloyd Wright. The elder Wright was fired from the project in 1921 due to cost overages on the project. Disillusioned by the costs of construction and maintenance, Barnsdall donated the house to the city of Los Angeles in 1927 under the stipulation that a fifteen-year lease be given to the California Art Club for its headquarters. The club was there until 1942 when the house was almost demolished. The house has been used as an art gallery and as a United Service Organizations (USO) facility over the years. Beginning in 1974, the city sponsored a series of restorations, but the structure was damaged in the 1994 Northridge earthquake. It was again restored, and was open to the public as of June 2005. The U.S. Department of the Interior designated Hollyhock House a National Historic Landmark in 2007. It was the seventh site in the city of Los Angeles to receive that designation. The house was included in a list of all time "top ten" Los Angeles houses in a Los Angeles Times survey of experts in December 2008. In 2005, Project Restore initiated a 10-year restoration project. Project Restore is a non-profit organization dedicated "to the historic restoration and preservation of the civic