We all know they were intercepted, because it happened to Flynn, the US-persons information wasn’t minimized, with no FISA warrant, and all 17 agencies were allowed to have the raw data.
But, as you infer, that’s the real story, not the tapping of one building, although that’s a huge attention-grabbing story too. Bigger story is that Fed resources were used against private citizens (Flynn proved it) by the Obama regime.