Premise: Mayor Michael Bloomberg seemed ambivalent to the change, saying "I would like to see it stay the Freedom Tower, but it's their building, and they don't need me dumping on it. If they could rent the whole thing by changing the name, I guess they're going to do that, and they probably, from a responsible point of view, should. From a patriotic point of view, is it going to make any difference?".
Hypothesis: The building's owners were having trouble renting it out.