 <translate> I got a question for you: The Willis Tower, built as and still commonly referred to as the Sears Tower, is a 110-story, 1,450-foot (442.1 m) skyscraper in Chicago, Illinois. At completion in 1973, it surpassed the World Trade Center towers in New York to become the tallest building in the world, a title it held for nearly 25 years; it remained the tallest building in the Western Hemisphere until the completion of a new building at the World Trade Center site in 2014. The building is considered a seminal achievement for its designer Fazlur Rahman Khan. The Willis Tower is the second-tallest building in the United States and the Western hemisphere -- and the 16th-tallest in the world. More than one million people visit its observation deck each year, making it one of Chicago's most-popular tourist destinations. The structure was renamed in 2009 by the Willis Group as part of its lease on a portion of the tower's space.

Based on this passage, what is the name of the old sears tower in chicago?
Let's think first: <yor> Mo ní ìbéèrè kan fún yín: Ilé gogoro Willis Tower, tí wọ́n kọ́ gẹ́gẹ́ bí ilé gogoro Sears, tí wọ́n sì ṣì ń pè é títí dòní, jẹ́ ilé olókè gíga kan tó jẹ́ ọ̀ọ́dúnrún-lẹ́ẹ̀kan, tó sì ga tó ẹgbẹ̀rún mẹ́rin ó lé àádọ́ta [1,450] ẹsẹ̀ bàtà [442.1 m] ní Chicago, Illinois. Nígbà tí wọ́n parí rẹ̀ ní ọdún 1973, ó lé àwọn ilé gogoro World Trade Center ní New York láti di ilé gíga jùlọ ní àgbáyé, oyè tí ó ní fún nǹkan bí ọdún mẹ́ẹ̀ẹ́dọ́gbọ̀n; ó jẹ́ ilé gíga jùlọ ní Ìwọ̀ Oòrùn ayé títí di ìgbà tí wọ́n parí ilé tuntun ní ibi World Trade Center ní ọdún 2014. A kà ilé náà sí àṣeyọrí pàtàkì fún olùdásílẹ̀ rẹ̀ Fazlur Rahman Khan. Ilé Willis Tower ni ilé kejì tó ga jùlọ ní Orílẹ̀-èdè Amẹ́ríkà àti ní Ìwọ̀ Oòrùn ayé -- àti ilé kẹrìndínlógún tó ga jùlọ lágbàáyé. Ó lé ní mílíọ̀nù kan èèyàn tó máa ń wá síbi tí wọ́n ti ń wòran lọ́dọọdún, èyí sì mú kó jẹ́ ọ̀kan lára àwọn ibi táwọn arìnrìn-àjò afẹ́ tó pọ̀ jù lọ ní Chicago ń lọ. A ṣe atunkọ ile naa ni ọdun 2009 nipasẹ Ẹgbẹ Willis gẹgẹbi apakan ti yiyalo rẹ lori apakan ti aaye ile-iṣọ naa.  Ní ìbámu pẹ̀lú àyọkà yìí, kí ni orúkọ ilé gogoro Sears tó wà ní Chicago? Ẹ jẹ́ ká kọ́kọ́ ronú: 