Pisa Tower vs Prime Tower

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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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The Prime Tower, also called'Maag-Tower' in a previous stage of preparation, is a skyscraper in Zurich, Switzerland. At a height of 126 metres (413 feet ), it was the highest skyscraper in Switzerland from 2011 until 2015, when the Roche Tower at Basel (standing at 178 metres (584 feet )) was finished. The building is situated near the Hardbrücke railway station. The tower replaces an industrial facility that's been demolished. According to its developers, the tower's construction, which took 15 years to plan and execute, was a financial success, with its valuation based on rental rates exceeding the building cost by CHF 110 million.The tower and its two companion buildings, Cubus and Diagonal, are used primarily as office buildings. Due to its opening in December 2011, the tower hosts the'Clouds' restaurant on its top floor, a conference center, the Hotel Rivington & Sons on the ground floor, in addition to the offices of Deutsche Bank Schweiz, Homburger AG, Transammonia, Korn/Ferry International, Citibank Switzerland, Infosys, Repower AG, Ernst & Young, Zürcher Kantonalbank and consulting firms.

Source: Wikipedia