Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rank | Name | Image | Height\nft (m) | Floors | Year | Notes |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | Key Tower |  | 947 (289) | 57 | 1991 | 104th-tallest building in the world\n20th-tallest building in the United States\nHas been the tallest building in the city and state since 1991\nStood as the tallest building in the United States between New York City and Chicago from its completion until 2007, when Comcast Center in Philadelphia was completed\nTallest building constructed in Cleveland in the 1990s |
| 2 | Terminal Tower |  | 723 (220) | 52 | 1930 | 114th-tallest building in the United States\nStood as the tallest building in the world outside of New York City until 1964\nTallest building constructed in the city in the 1930s |
| 3 | 200 Public Square |  | 658 (201) | 45 | 1985 | Also known as the BP Building\nTallest building constructed in the city in the 1980s |
| 4 | Tower at Erieview |  | 529 (161) | 40 | 1964 | Tallest building constructed in Cleveland in the 1960s |
| 5 | One Cleveland Center |  | 450 (137) | 31 | 1983 |  |
| 6 | Fifth Third Center |  | 446 (136) | 27 | 1992 |  |
| 7 | Federal Court House Tower |  | 430 (131) | 23 | 2002 | Tallest building constructed in the city in the 2000s\nMost recently completed skyscraper in the city |
| 8 | Justice Center Complex |  | 420 (128) | 26 | 1977 | Tallest building constructed in the city in the 1970s |
| 9 | Anthony J. Celebrezze Federal Building |  | 419 (128) | 31 | 1967 |  |
| 10 | PNC Center |  | 410 (125) | 35 | 1980 | Originally known as the National City Center; building was renamed in 2009 |
| 11 | AT Tower |  | 390 (119) | 28 | 1971 | Previously known as Cleveland Trust Tower\nCurrently being redeveloped as a mixed use hotel, retail, and residential building attached to the new Cuyahoga County Headquarters\nAlso known as 900 Euclid Tower |
| 12 | AT&T Huron Road Building |  | 365 (111) | 24 | 1927 | Commonly known as Ohio Bell Buildinh\nPreviously known as the Ameritech Building\nTallest building constructed in Cleveland in the 1920s |
| 13 | Rhodes Tower |  | 363 (111) | 20 | 1971 | Originally known as the University Tower |
| 14 | Eaton Center |  | 356 (109) | 28 | 1983 |  |
| 15 | Ernst & Young Tower |  | 330 (101) | 21 | 2013 | Phase I of the Flats East Bank redevelopment project\nFirst downtown private office building constructed since 1992 |
| 16 | Marriott at Key Center |  | 320 (98) | 28 | 1991 | Tallest all-hotel building in the city |
| 17 | McDonald Investment Center |  | 308 (94) | 23 | 1968 | Also known as Key Center\nFormerly known as the Central National Bank Building |
| 18 | 55 Public Square |  | 300 (91) | 22 | 1958 | Tallest building constructed in the city the 1950s\nOriginally known as the Illuminating Building |
| 19 | Huntington Bank Building | — | 289 (88) | 21 | 1924 |  |
| 20 | North Point Tower |  | 285 (87) | 20 | 1990 |  |
| 21= | Diamond Building |  | 282 (86) | 23 | 1972 |  |
| 21= | Standard Building |  | 282 (86) | 21 | 1925 |  |
| 23 | 1717 East Ninth Building | — | 275 (84) | 21 | 1959 | Also known as the East Ohio Building |
| 24 | Keith Building |  | 272 (83) | 21 | 1922 |  |
| 25= | East Tower |  | 266 (81) | 25 | 1973 | Tallest all-residential building in the city\nAlso known as the Reserve Square Apartments |
| 25= | Embassy Suites Tower |  | 266 (81) | 26 | 1969 | Also known as Embassy Suites at Reserve Square |
| 27 | Superior Building |  | 265 (81) | 22 | 1922 |  |
| 28 | Fenn Tower |  | 265 (81) | 21 | 1930 |  |
| 29 | Landmark Office Towers |  | 260 (79) | 22 | 1930 |  |
| 30= | Penton Media Building | — | 253 (77) | 21 | 1972 |  |
| 30= | Ohio Savings Plaza | — | 253 (77) | 17 | 1969 |  |
| 30= | Ameritech Center |  | 253 (77) | 16 | 1983 |  |
Question:
when the key tower was built in 1991, what was the previous tallest building constructed?
Answer:
Terminal Tower