They don't seem to have a clue about any of the existing heights on that diagram. Proto is about 40' too short. Marriott is too high. MXD is almost 50' too short. All the MIT stuff is too short. It seems like they are leaving off the mech heights most of the time, which is why the Marriott listing is so baffling! A few of the heights actually seem to be close to correct too, like the Broad Institute giant lab on Ames St. It's a very odd diagram indeed.