I am not an attorney, but have done some research into this and spoken to attorneys and also asked about it in a UAS FAA webinar a couple of years ago, as I have done some commercial flying inside buildings that were surrounded by class B and Class D airspace. Based on that, my understanding is that the FAA's authority is limited to the National Air Space, and that does NOT include any portion of the space inside buildings. So none of the FAA's regulations would apply to anything done inside a building, including the prohibitions regarding flying over people. And the fact that the OP said "As a 107 Pilot" does not change that, since that status is irrelevant to operations indoors. However, just because the FAA's rules don't apply indoors does not mean that their safety concerns aren't relevant indoors. I always try to fly my drone safely for the basic ethical reason that I have no right to endanger others with my drone. The fact that the FAA rules don't apply indoors does not change that for me. I would also expect that the building owners would have "jurisdiction" over what you can do with your drone in their building, and of course you'd need to comply with their rules too.