When did the leaning tower of pisa started leaning?

Question

When did the leaning tower of pisa started leaning?

Answer 1

Too soon... it started to lean soon after it was built in the 11-hundreds

Answer 2

February 27, 1964 :)

Answer 3

Although intended to stand vertically, the tower began leaning to the southeast soon after the onset of construction in 1173 due to a poorly laid foundation and loose substrate that has allowed the foundation to shift direction.

The height of the tower is 55.86 m (183.27 ft) from the ground on the lowest side and 56.70 m (186.02 ft) on the highest side. The width of the walls at the base is 4.09 m (13.42 ft) and at the top 2.48 m (8.14 ft). Its weight is estimated at 14,500 tonnes. The tower has 294 steps. The tower leans at an angle of 5.5 degrees[1]. This means that the top of the tower is 4.5 meters from where it would stand if the tower was perfectly vertical. [2]