Actually, BC has no such right.
I have no right to buy some coin-operated washing machines and run a laundromat out of my basement. I have no right to buy my neighbors homes, combine the lots, demolish the existing homes, and build a 10 story apartment building. And regardless of whether or not it is a good idea, Boston College has no "right" to build dormitories, athletic stadiums, or anything else that does not pass the City's review.
Like it or not, we are all governed by Boston's Zoning Code and Boston and every other town and city in America does have the right to limit and restrict development and use of property.
Perhaps the folks at the Boston College Environmental Affairs Law Review might consider the issues relative to BC's planned expansion, especially considering the environmental impacts of development on the former seminary's green space.
University has a right to expand - Opinions