So this is new: 15x15 dedicated n5 in an area where AT&T has all of 850. Means they have as much low-band NR las T-Mobile does (way less mid-band though, even counting the occasional n2/66). https://twitter.com/iansltx/status/1527426642301403145?t=n2MWeh4psvOy-HMzvLYWBQ&s=19
I kinda figured I was a bit too far east, since only Cells 2/12/22 were found, and nothing from Cells 3/13/23. Moved it to the location you mentioned.
When Sprint eNBs 6695 was converted, B25 from Sprint was still being broadcasted as well. At the time the keep PLMN wasn't a thing in NYC yet, and I don't know if they have a Sprint RRU up there, but I would guess broadcasting 310-120 B25 on converted sites is a way to maintain coverage for legacy Sprint users.