T-Mobile eNB 879491/879493/879494 on the keep site map is located at 40.77536940167816, -73.92011957697034.
Sprint eNB 5762 is now T-Mobile eNB 306271.
Located at 40.582064139078206, -74.16175767702059
Weirdly both of the new Sprint conversions that have been found in Staten Island (eNB 306271 and eNB 326459) were sites I visited earlier this summer but neither of them were broadcasting the keep PLMN at the time. In fact, Sprint eNB 5762 was completely offline when I visited. I suspected both sites were keep sites based on their location relative to neighboring T-Mobile sites so I was surprised when I didn't spot 312-250 coming from them. Glad to see T-Mobile still kept them.
Also T-Mobile isn't done with non-conversion new builds in the city. T-Mobile eNB 894075 is a brand new site added this summer on Rockefeller University's campus in Manhattan. It gives me hope for neighborhoods like Red Hook and Williamsburg that desperately need sites along the waterfront.