170+ million for a BUILDING?! That doesn't make sense to me at all - as someone who spends his waking hours in research laboratories in a newish building of comparable size to the Chen building, I can't see where the money would go.
Well....for starters there is the monkey tunnel that leads from Broad to the Chen building because....you guessed it....the vivarium was in the basement (and still is) of Broad. Many neuroscience labs were in Broad (a VERY nice building in and of itself).