It's actually not a government structure. Not today, not ever -- it's still owned by the private company Carpenters Company that built it about 250 years ago. Sure, the property that surrounded it is owned by the federal government, but not the building or the plot it sits on. And the reason the First Continental Congress took place there is exactly because it was a non-government building -- they were, after all, subverting the existing government in a way that could be seen as treasonous.