For highrise construction, cranes usually start at a low height and are raised as the building under construction increases in height. Having said that, I don't think the crane is there for construction of the condominium planned for that spot, seeing as sales haven't even started for the project.
From what I understand, it is there for construction of the underground parking garage, which is to be a common parking facility for the hotels in the project. The parking garage is going where the demolished east wing of the Federal Building once stood. That would explain the height of the crane. The condo is a later phase in the project and will be built above the underground parking garage.
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"A government that robs Peter to pay Paul can always depend on the support of Paul"
-George Bernard Shaw
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