This is the London Plane tree whose bark falls off after it absorbs the pollution in the air which is good for the environment.
Platanus × acerifolia, Platanus × hispanica, or hybrid plane, is a tree in the genus Platanus. It is often known by the synonym London plane, or London planetree. It is usually thought to be a hybrid of Platanus orientalis (oriental plane) and Platanus occidentalis (American sycamore). Some authorities think that it may be a cultivar of P. orientalis. Wikipedia.
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