Question: When did the roof gardens above the district where George Palao is born, open to the public?

full_context: Document 1: Plymouth: Upper Palaeolithic deposits, including bones of Homo sapiens, have been found in local caves, and artefacts dating from the Bronze Age to the Middle Iron Age have been found at Mount Batten showing that it was one of the main trading ports of the country at that time. An unidentified settlement named 'TAMARI OSTIA' (mouth/estuaries of the Tamar) is listed in Ptolemy's Geographia and is presumed to be located in the area of the modern city.
Document 2: Department store: The middle up segment is mainly occupied by Metro Department Store originated from Singapore and Sogo from Japan. 2007 saw the re-opening of Jakarta's Seibu, poised to be the largest and second most upscale department store in Indonesia after Harvey Nichols, which the latter closed in 2010 and yet plans to return. Other international department stores include Debenhams and Marks & Spencer. Galeries Lafayette also joins the Indonesian market in 2013 inside Pacific Place Mall. This department store is targeting middle up market with price range from affordable to luxury, poised to be the largest upscale department store. Galeries Lafayette, Debenhams, Harvey Nichols, Marks & Spencer, Seibu and Sogo are all operated by PT. Mitra Adiperkasa.
Document 3: Kensington Roof Gardens: The building housed the department store Derry and Toms until 1973, and then Biba until 1975. Since the 1980s the garden has been used as a restaurant and club.
Document 4: Holy Spirit Grotto: The Holy Spirit Grotto ("La Gruta del Espíritu Santo" in Spanish), also known as Corinto Cave, in Corinto, Morazán, El Salvador, is a registered national monument of petroglyphs. The cave is largely associated with the Xibalba legend. The archaeologist Wolfgang Haberland performed studies in the late 1970s indicating the art belongs to the pre-Classic stage of Mesoamerican civilization. The cave likely got its name due to the Mesoamerican association of caves with the underworld, meaning that they are "considered an entrance to the underground world governed by spirits and deities of death, disease, water, and fertility." The cave is an important cultural and religious site for the Lenca nation, forming part of their traditions and legends of the place where ancestors of Balam Colop parted (which is mentioned in the Popol vuh), according to their legends and traditions, is father of all Lenca people, given the association of caves with the underworld by Mesoamericans, the name of 'Holy Spirit Cave' is ironic and perhaps an attempt by early Spanish to "exorcise" the cave in El Salvador. The "holy" nature of this cave is further confirmed by a man named Don Argelio Alvarez, who happens to be one of its guardians. Roughly translated, he claims that the cave contains "something magical and inexplicable that inspires tranquility and peace." Many people from various religious groups also continue to visit the site and carry out ceremonies, such as what Don Argelio believed to have taken place in the cave many centuries ago. However, it is entirely possible that the cave was instead used for other means. A German scientist found some handcrafted arrows and knives made of obsidian within the cave, leading him to believe that it may have actually been a shelter for hunters instead.
Document 5: Department store: All major cities have their distinctive local department stores, which anchored the downtown shopping district until the arrival of the malls in the 1960s. Washington, for example, after 1887 had Woodward & Lothrop and Garfinckel's starting in 1905. Garfield's went bankrupt in 1990, as did Woodward & Lothrop in 1994. Baltimore had four major department stores: Hutzler's was the prestige leader, followed by Hecht's, Hochschild's and Stewart's. They all operated branches in the suburbs, but all closed in the late twentieth century. By 2015, most locally owned department stores around the country had been consolidated into larger chains, or had closed down entirely.
Document 6: Josep Palau i Fabre: Josep Palau i Fabre (born April 21, 1917 in Barcelona- died in the same city on February 23, 2008) was a Spanish Catalan poet and writer. He was a representative of Catalan literature during the post-World War period and a world expert on the work of Pablo Picasso.
Document 7: Plymouth: In 2004 the old Drake Circus shopping centre and Charles Cross car park were demolished and replaced by the latest Drake Circus Shopping Centre, which opened in October 2006. It received negative feedback before opening when David Mackay said it was already "ten years out of date". In contrast, the Theatre Royal's production and education centre, TR2, which was built on wasteland at Cattedown, was a runner-up for the RIBA Stirling Prize for Architecture in 2003.
Document 8: Gershon Galil: Gershon Galil is Professor of Biblical Studies and Ancient History and former chair of the Department of Jewish History at the University of Haifa, Mount Carmel, Haifa, Israel.
Document 9: Gerard V. Middleton: Since then, he has published a summary of the history of geology in Canada, and short biographies of Canadian geologists. Another Canadian geologist Joseph William Winthrop Spencer (1851–1921; born in Dundas, ON) was the subject of a more extensive study. He has also published historical studies of geologists elected the Royal Society of Canada during its first fifty years, and the history of the earth sciences during the twentieth century. During the last five years he has studied the source of the stone used for building in nineteenth-century southern Ontario.
Document 10: Neues Schauspielhaus: While the auditorium was destroyed in World War II, the facade as well as the cinema survived and in 1951 was renamed the Metropol. Since 1977 it has been used as a discothèque and became a famous music club during the 1980s heyday of West Berlin, frequented by bands like Depeche Mode, Morrissey, The Cross, The Human League and Front 242. For a short time in 2000 it was the location of the KitKatClub and in 2005 the architect Hans Kollhoff remodeled the interior as the "Goya" night club.
Document 11: Grotto in the Gulf of Salerno: Grotto in the Gulf of Salerno is the subject of at least four paintings completed by Joseph Wright of Derby following his visit there in 1774. The paintings show the different lighting at different times of the day.
Document 12: Department store: All the major British cities had flourishing department stores by the mid-or late nineteenth century. Increasingly, women became the major shoppers and middle-class households. Kendals (formerly Kendal Milne & Faulkner) in Manchester lays claim to being one of the first department stores and is still known to many of its customers as Kendal's, despite its 2005 name change to House of Fraser. The Manchester institution dates back to 1836 but had been trading as Watts Bazaar since 1796. At its zenith the store had buildings on both sides of Deansgate linked by a subterranean passage "Kendals Arcade" and an art nouveau tiled food hall. The store was especially known for its emphasis on quality and style over low prices giving it the nickname "the Harrods of the North", although this was due in part to Harrods acquiring the store in 1919. Other large Manchester stores included Paulden's (currently Debenhams) and Lewis's (now a Primark).
Document 13: Gibbs Point: Gibbs Point, a rock point on the Antarctic Peninsula, the most northern area of the continent of Antarctica, was named for African American Antarctic explorer, George W. Gibbs, Jr. on September 2, 2009. On that date, the Advisory Committee on Antarctic Names (U.S. Board on Geographic Names) confirmed the place name in Antarctica for Gibbs as the first black explorer to set foot on the continent. Gibbs Point is a rock point forming the northwest entrance to Gaul Cove, on the northeast of Horseshoe Island, Marguerite Bay, Antarctic Peninsula.
Document 14: Department store: The design and function of department stores in Germany followed the lead of London, Paris and New York. Germany used to have a number of department stores; nowadays only a few of them remain. Next to some smaller, independent department stores these are Karstadt (in 2010 taken over by Nicolas Berggruen, also operating the KaDeWe in Berlin, the Alsterhaus in Hamburg and the Oberpollinger in Munich), GALERIA Kaufhof (part of the Metro AG). Others like Hertie, Wertheim and Horten AG were taken over by others and either fully integrated or later closed.
Document 15: George Palao: George L. Palao BEM (4 October 1940, Kensington, United Kingdom - 2009, Gibraltar) was a Gibraltarian historian and potholer and illustrator. He was particularly known for his excavations and finds in many caves of Gibraltar.
ground_truth: 1980s
sub_queries: George Palao >> place of birth Answer: Kensington
when did the roof gardens above Kensington open to the public Answer: 1980s