I've looked into it, but I don't know that anyone is sure. My best guess is ICBC. One of the biggest banks in the world in Trump tower. Back in 2016 you could hear squeaks about 'ICBC paying above market rates for rent' being a problem. Could you see this being used for a FISA based on what you know?
https://therealdeal.com/2016/11/28/chinese-banks-trump-tower-lease-could-spell-trouble-for-prez-elect/
https://www.bloomberg.com/news/articles/2019-01-09/china-s-biggest-bank-said-to-reduce-space-at-nyc-s-trump-tower