Question: What is the pyramid building in the city where Gregg Tafralis was born?

full_context: Document 1: Ultima Tower: The Ultima Tower is a hypothetical supertall skyscraper, designed by American architect Eugene Tsui in 1991. It has been envisioned to be built in San Francisco, California and could accommodate up to 1 million people. With a total height of , the tower would be 2 miles tall, and comprise 500 stories if built. It is one of the tallest buildings/man-made structures ever conceived.
Document 2: Houston: Centered on Post Oak Boulevard and Westheimer Road, the Uptown District boomed during the 1970s and early 1980s when a collection of mid-rise office buildings, hotels, and retail developments appeared along Interstate 610 west. Uptown became one of the most prominent instances of an edge city. The tallest building in Uptown is the 64-floor, 901-foot (275 m)-tall, Philip Johnson and John Burgee designed landmark Williams Tower (known as the Transco Tower until 1999). At the time of construction, it was believed to be the world's tallest skyscraper outside of a central business district. The new 20-story Skanska building and BBVA Compass Plaza are the newest office buildings built in Uptown after 30 years. The Uptown District is also home to buildings designed by noted architects I. M. Pei, César Pelli, and Philip Johnson. In the late 1990s and early 2000s decade, there was a mini-boom of mid-rise and high-rise residential tower construction, with several over 30 stories tall. Since 2000 more than 30 high-rise buildings have gone up in Houston; all told, 72 high-rises tower over the city, which adds up to about 8,300 units. In 2002, Uptown had more than 23 million square feet (2,100,000 m²) of office space with 16 million square feet (1,500,000 m²) of Class A office space.
Document 3: Georgios Tsakanikas: Tsakanikas won a gold medal in the 1959 Mediterranean Games and a bronze medal in the 1959 Summer Universiade in shot out, he also represented Greece in the 1956, 1960 and 1964 Summer Olympic Games in shot put and in 1964 in discus throw. Tsakanikas also competed tor Greece in the Balkan Games winning four silver medals in shot put in 1955, 1957, 1959, 1960, 1961. The Balkan Games have now become a loose collection of Balkan Championships. Tsakanikas personal best in shot put is 18, 21 m. achieved on 26 December 1964 in Athens. He died in Athens, March 1, 2016.
Document 4: Salesforce Tower: Salesforce Tower, formerly known as the Transbay Tower, is a 1,070 - foot (326 m) office skyscraper under construction in the South of Market district of downtown San Francisco. It is located at 415 Mission Street between First and Fremont Streets, next to the Transbay Transit Center site. Salesforce Tower is the centerpiece of the San Francisco Transbay redevelopment plan. The plan contains a mix of office, transportation, retail, and residential uses. When completed, the tower will be the tallest in San Francisco. With a top roof height of 970 feet (296 m) and an overall height of 1,070 feet (326 m), it will be the second - tallest building west of the Mississippi River after the Wilshire Grand Center in Los Angeles.
Document 5: Georgios Stefanopoulos: Georgios Stefanopoulos (; born March 31, 1962 in Peristeri, Attiki) is a former boxer from Greece, who participated in two Summer Olympics for his native country in the men's heavyweight division (– 91 kg), starting in 1984 in Los Angeles, California. He twice won a medal at the European Championships in the early 1990s. Georgios also had some success in kickboxing, winning a gold medal in the Full-Contact heavyweight category at the W.A.K.O. European Championships 1986.
Document 6: Greg Best: Gregory Alan "Greg" Best (born July 23, 1964 in Lynchburg, Virginia) is an equestrian competitor and coach in the sport of show jumping who won two silver medals for the United States in the 1988 Summer Olympic Games in Seoul, South Korea riding the famous Gem Twist. In 1992, Best suffered a fall that shattered his shoulder. After this, he moved to New Zealand, where he rode for the New Zealand League, winning the World Cup Series. He has also served as a New Zealand National Show Jumping Selector, a National Show Jumping Coach and a member of the New Zealand Show Jumping High Performance Committee. Best coached New Zealand's jumpers for the 2004 Summer Olympic Games in Athens. Between 1987 and 2003, Best also garnered 6 FEI World Cup wins. He now conducts coaching clinics in the United States, Canada and New Zealand. Along with Gem Twist, horses named Santos and Entrepreneur have been among his champion mounts.
Document 7: Gregg Tafralis: Gregg Tafralis ("Gregory Louis Tafralis;" born April 9, 1958 in San Francisco, California) is a former track and field athlete from the United States, who set the best world year performance in the men's shot put event in 1992. He competed for his native country at the 1988 Summer Olympics, finishing in ninth place.
Document 8: William Pereira: William Leonard Pereira (April 25, 1909 – November 13, 1985) was an American architect from Chicago, Illinois, who was noted for his futuristic designs of landmark buildings such as the Transamerica Pyramid in San Francisco. Remarkably prolific, he worked out of Los Angeles, and was known for his love of science fiction and expensive cars, but mostly for his unmistakable style of architecture, which helped define the look of mid-20th century America.
Document 9: Greg Bell (athlete): Greg Bell (born November 7, 1930 in Terre Haute, Indiana) is a former track and field athlete who won the Gold Medal in the Long Jump at the 1956 Summer Olympics in Melbourne, Australia.
Document 10: 580 California Street: 580 California Street is a high rise office building completed in 1987 in the Financial District of San Francisco, California. The postmodern, , 23 story tower is bordered by Kearny Street and California Street, and is topped with three faceless, twelve foot tall statues, on each side of the building on the twenty-third floor. The art installation is entitled "The Corporate Goddesses" by Muriel Castanis, the late designer and creator of the sculptures.
Document 11: Stephanie Brown Trafton: Stephanie Brown Trafton (born December 1, 1979) is an American track and field athlete who won the discus throwing gold medal at the 2008 Summer Olympics in Beijing. She is thus one of only two American women to have ever won the event, and the only one since the Great Depression.
Document 12: Transamerica Pyramid: The Transamerica Pyramid at 600 Montgomery Street between Clay and Washington Streets in the Financial District of San Francisco, California, United States, is a 48 - story postmodern building and the second - tallest skyscraper in the San Francisco skyline. Its height will be surpassed by Salesforce Tower, currently under construction. The building no longer houses the headquarters of the Transamerica Corporation, which moved its U.S. headquarters to Baltimore, Maryland, but it is still associated with the company and is depicted in the company's logo. Designed by architect William Pereira and built by Hathaway Dinwiddie Construction Company, at 853 feet (260 m), on completion in 1972 it was the eighth - tallest building in the world.
Document 13: 1201 Third Avenue: 1201 Third Avenue (formerly Washington Mutual Tower) is a , 55-story skyscraper in Downtown Seattle, in the U.S. state of Washington. It is the second-tallest building in the city, the eighth-tallest on the West Coast of the United States, and the 74th-tallest in the United States. Developed by Wright Runstad & Company, construction began in 1986 and finished in 1988. 1201 Third Avenue was designed by Kohn Pedersen Fox Associates and The McKinley Architects. The building was the world headquarters of the financial company Washington Mutual from the building's opening until 2006, when the company moved across the street to the WaMu Center (renamed the Russell Investments Center after the bank collapsed in 2008).
Document 14: Prudential Tower: The Prudential Tower, also known as the Prudential Building or, colloquially, The Pru, is an International Style skyscraper in Boston, Massachusetts. The building, a part of the Prudential Center complex, currently stands as the 2nd - tallest building in Boston, behind 200 Clarendon Street, formerly the John Hancock Tower. The Prudential Tower was designed by Charles Luckman and Associates for Prudential Insurance. Completed in 1964, the building is 749 feet (228 m) tall, with 52 floors, and (as of February 2018) is tied with others as the 96th - tallest in the United States. It contains 1,200,000 sq ft (110,000 m) of commercial and retail space. Including its radio mast, the tower stands as the tallest building in Boston, rising to 907 feet (276 m) in height.
Document 15: Namibia: Inline hockey was first played in 1995 and has also become more and more popular in the last years. The Women's inline hockey National Team participated in the 2008 FIRS World Championships. Namibia is the home for one of the toughest footraces in the world, the Namibian ultra marathon. The most famous athlete from Namibia is Frankie Fredericks, sprinter (100 and 200 m). He won four Olympic silver medals (1992, 1996) and also has medals from several World Athletics Championships. He is also known for humanitarian activities in Namibia and beyond.
ground_truth: Transamerica Pyramid
sub_queries: What was Gregg Tafralis's city of birth? Answer: San Francisco
what is the pyramid building in San Francisco Answer: Transamerica Pyramid