All of them but the Stephen A. Shwarzman building has a special place in my heart.
When I did my new york residency I spent so much time in the library. I was so broke and it was free and I could spend hours in the presence of other people without any obligation of actually socialising. Every trip I would go to the cafe and buy an espresso, plan my research in the cafe, wander around the gift shop planning what I would eventually buy to take people home, then go into a reading room to plan artworks and learn. The Treasures exhibition was so beautiful (I cried when I saw the real life Winnie the Pooh). Really feels like a peaceful place to sit and think or wander around. I genuinely think about how much I miss my trips there near daily.