Burj Khalifa with Smith's attempts to make the crown more slender. The building opened on 4 January 2010. The tower was designed by Skidmore, Owings and Merrill (SOM), which also designed the Willis Tower (formerly the Sears Tower) in Chicago and the One World Trade Center in New York City. Burj Khalifa uses the bundled tube design of the Willis Tower, invented by Fazlur Rahman Khan. Due to its tubular system, proportionally only half the amount of steel was used in the construction, compared to the Empire State Building. Khan's contributions to the design of tall buildings have had a profound impact
Sears, Roebuck & Company Mail Order Building (Los Angeles, California) Deco tower and "Sears" sign became a "beacon for Eastsiders returning home on area freeways," and has been described by the Los Angeles Conservancy as "one of the dominant visual icons of the Eastside" of Los Angeles. The distribution center was closed in January 1992, eliminating jobs for 585 full-time workers and 775 part-timers. The facility's general manager said at the time that the Boyle Heights center was the most expensive that Sears operated, partly because the facilities were "outdated." In 2004, developer MJW Investments announced it had acquired the building and would make it the centerpiece of a proposed