Is That A Roosevelt Island Christmas Tree Reflected In Lights On East River Near Octagon Building? Or What?

According to the Roosevelt Island Twitterverse:

There's that underwater Christmas🎄Tree again! ... #EastRiver 🗽 #RooseveltIsland #FDR /79th ... #LGA tower upper left pic.twitter.com/vqZp5YY3GH

— Rock and Rhone (@RockandRhone) December 20, 2015