Back when I worked at Goldman, I was told that either their HQ or their Jersey City tower over by the Statue of Liberty had a huge water thermal mass in the bas

Back when I worked at Goldman, I was told that either their HQ or their Jersey City tower over by the Statue of Liberty had a huge water thermal mass in the basement. They took advantage of cheaper electricity at night to use heat pumps to push the thermal mass whichever way they needed it to go for the next day's heating/cooling needs.