Pisa Tower vs Two Prudential Plaza

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The Leaning Tower of Pisa (Italian: Torre pendente di Pisa) or simply the Tower of Pisa (Torre di Pisa [?torre di ?pi?za]) is the campanile, or freestanding bell tower, of the cathedral of this Italian city of Pisa, known globally for its almost four-degree lean, the result of an unstable foundation. The tower is situated behind the Pisa Cathedral and is the third-oldest structure in the city's Cathedral Square (Piazza del Duomo), following the palace and the Pisa Baptistry. The height of this tower is 55.86 metres (183.27 feet) from the ground on the low side and 56.67 metres (185.93 feet) on the high side.

The width of the walls at the base is 2.44 m (8 feet 0.06 in). Its weight is estimated at 14,500 metric tons (16,000 short tons). The tower has 296 or 294 steps; the seventh floor has two fewer steps on the north-facing staircase. The tower began to lean during construction in the 12th century, due to soft ground which could not properly support the structure's weight, and it worsened through the completion of building in the 14th century. By 1990, the tilt had reached 5.5 degrees. The structure was stabilized by remedial work between 1993 and 2001, which decreased the tilt to 3.97 degrees.

Source: Wikipedia

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Two Prudential Plaza is a 64-story skyscraper located in the Loop area of Chicago, Illinois, United States.

At 995 ft (303 m) tall, it's now the sixth-tallest building in Chicago and the seventeenth-tallest in the U.S., being only five feet from 1,000 ft, making it the closest of any building under 1,000. Built in 1990, the building was designed by the firm Loebl Schlossman & Hackl, with Stephen T. Wright as the principal in charge of design. It has been honored with 8 awards, including winning the Best Structure Award from the Structural Engineers Association of Illinois in 1995. At the time of completion, Two Prudential was the world's tallest reinforced concrete building. Its distinctive shape features stacked chevron setbacks on the north and south sides, a pyramidal peak rotated 45°, and an 80-foot (24 m) spire. The building is attached to One Prudential Plaza (formerly called the Prudential Building). With no spire, the building's height is still slightly greater than that of One Prudential Plaza's pinnacle.In May 2006, BentleyForbes, a Los Angeles-based property investment firm, run by Frederick Wehba and his family bought Two Prudential Plaza, along with its sister property, One Prudential Plaza for $470 million.In 2015, BentleyForbes defaulted on the mortgage for the towers on account of the terrific Recession and New York-based investors 601W Firms and Berkley Properties took control of the property after investing more than $100 million in equity to recapitalize. BentleyForbes, the former controlling owner of the towers, continues to have an interest in the owning partnership.The building is also the new home of the Chicago Tribune and tronc, Inc. after leaving Tribune Tower in July 2018.

Source: Wikipedia