Design Bookstore in NYC
Urban Center Books, The Municipal Art Society of New York

I found this design bookstore that covers just about every design book or magazine, even if you're searching for something so obscure. This reminds me of Hennessy and Ingalls (design/architecture/art/photography bookstore in Los Angeles, located at one of the cross streets of Third Street Promenade). I stumbled upon this bookstore, while I visited the Jane Jacobs exhibition (457 Madison Avenue at 51st Street). Clay Shirky's Network Effects class introduced Jane Jacob's book The Death and Life of Great American Cities. The exhibit is amazing, which I'll probably post later, but to give you a hint, Jane Jacobs is the New York version of Eleanor Roosevelt.
This store has books on different materials (glass, metal, concrete, building structure, lightweight/mobile), typologies (medical, offices, healthcare, restaurants, retail, pools/spas, sports/leisure, high rise), construction (concrete, wood, facades), sustainability, architecture, photography, typography, urban planning, foreign (books from Japan, Germany, etc). I asked if this store is permanent, and it is. They just have longer hours during the Jane Jacobs exhibition.
Here are some sample books:










