very accomplished with making the most out of the space he had, Wright also found the concept of "Unity" was very prominent mainly because of how he managed to fuse together space, experience and the material world. This was key to Unity Temple which has both a common meeting area and the congregation of church-goers. The sanctuary space gives the best example of this according to practicing architect Robert McCarter. The building was completed in 1908 and officially dedicated on September 26, 1909. Significance The building has been a United States National Historic Landmark since December 30, 1970 and was chosen in a 1991 poll in the magazine, Architectural Record as one of the 100 most significant buildings in the United States of the previous 100 years (Unity Temple was #14). Additionally, Unity Temple was chosen by the American Institute of Architects as one of 17 buildings by Frank Lloyd Wright that should be retained as his architectural contribution to American culture. In 2008, the U.S. National Park Service submitted Unity Temple, along with nine other Frank Lloyd Wright properties, to a tentative list for World Heritage Status. The 10 sites have been submitted as one, total, site. The January 22, 2008 press release from the National Park Service website announcing the nominations states that, "The preparation of a Tentative List is a necessary first step in the process of nominating a site to the World Heritage List." After revised proposals, the properties were inscribed on the World Heritage List under the title "The 20th-Century Architecture of Frank Lloyd Wright" in July 2019. Restoration A drawback to the modern design of the Unity Temple is structural problems that have emerged over time. Through the years of its existence, the Unity Temple's concrete structure has suffered extensive water damage. Pieces of the roof fell inside the structure, and water eroded other parts of the exterior, as well. The original Universalist (now Unitarian Universalist) congregation still uses Unity Temple, although a separate and secular organization, the Unity Temple Restoration Foundation is in charge of the building's multimillion-dollar restoration effort. The foundation and church developed a restoration plan over many years, beginning in 2000. In April 2009, Unity Temple, due to water seepage, was added to the National Trust for Historic Preservation's 11 most endangered historic places. Chicago restoration architect Gunny Harboe was in charge of the restoration with CTLGroup providing the engineering