Parties at Prime at the Bentley are pretty great. The view from the upper of the restaurant's two rooftop levels is glittering. City lights, river, it feels exciting. The catering/party menu included maybe the best slider I've ever had (not clear that there is any divide between a slider and a burger except size, but it was probably the best burger I've ever had)
You can hire the upper level as a private party space. they have it lined with banquettes, and should probably remove the banquette along the south window to allow a better flow of guests in a somewhat narrow, long room. The view gives it a level of dazzle other kosher places in the city can't match.
Readers of this list know what to expect of the Prime/Solo group menus - sushi, steak. Motzei Shabbat on the restaurant floor has an exciting vibe, the music is way too loud for comfortable conversation.
I understand that they have a 3-month lease that began at Sukkot. so, go now and hope they stay open so that we can have dinner on the wrap-around terrace next summer.
Make sure to check out the view of the city from the restroom on the upper level. Seriously.