The owner is Shahab Karmely :

The TV room with the pedophilia photographs is not in this 2015 slide show, but the other photos are the same, and he is listed as the owner: https://ny.curbed.com/2015/6/19/9948208/intense-upper-east-side-townhouse-wants-85000-month

He is a real estate developer, and an art collector although I couldn't find much on that.

His business backer is billionaire investor Daniel S. Loeb, who attended a Marina Abramovic party, and is on the board of directors at Sotheby's.

https://therealdeal.com/miami/2017/04/26/shahab-karmelys-secret-backer-is-hedge-fund-titan-dan-loeb-sources/

http://www.sothebys.com/en/inside/board-of-directors.html

A Dan Loeb is mentioned in this e-mail sent to JP:

https://wikileaks.org/podesta-emails/emailid/47880

Loeb is also an art collector.

I couldn't find any other connections, but I don't have a good feeling about any of this.