[THE BIG APPLE]

A building is able of being constructed ANYWHERE. We just had the tallest building in the world be built where? The Desert. Soft soil is nothing, but to construct on it (especially a supertall (now megatall) building) costs MORE money. You have to go LOWER into the ground. Here in NYC (on the island of Manhattan) the only reason tall buildings are economically and financially feasible is because of the hard bedrock (called manhattan schist). In Shanghai they have to go DEEP, until they reach stable land that can hold the building. So it's no problem.