I had a family member in Bethel in the late 70's. Funny, when visitiing, we stayed a couple nights in the Bossert when it was still a hotel (1977 or so). Later when it was purchased by the WT we stayed there again. There were still some non-JWs living there, as the NY laws didn't allow eviction of current residents as long as they paid their rent on time. The WT volunteer/labor/slaves had really spruced up the appearance of the rooms as well as the lobby. What happened to it later I don't know, but I expect non-JW financiers eventually bought it and made a nice profit from it.
Edit to add, I appreciate the video of the A-train, but I'm pretty sure the Bossert was in Brooklyn not too far from the JW HQ. I remember walking from the Bossert to 124 Columbia Heights