Jorge Posada's studio has been published on PS1/MoMA's website.
You can visit the creative space of the artist and find some recent
art work at PS1/MoMA studio visit.
By the way, PS1 is located just two blocks away from Posada's
studio in the same street, 46th avenue, in Long Island City.
Both easy to reach from Manhattan or Brooklyn by taking the E, 7 or G train.