Update — Fall 2012:
The spot has been fenced off for construction. The marble surface has been torn up.
Running alongside the southern end of the building’s is a marble two-up, five-down, with about forty-to-fifty feet of space in between to throw in a flatground trick for a line. The two-up can only be approached from the side (i.e. not straight on), and the landing for the five is only about five feet wide because there’s a city map structure to the right of the steps. There are some benches and dirt gaps at the upper portions of the plaza, but you are liable to get kicked out of them a lot quicker.
Bust — ♦♦♦ / Half-and-half: The security guards usually remain inside, but they make occasional patrols around the plaza and will tell you to leave if they see you. The spot is a part of one of the larger buildings in the Wall Street area, so there are a lot of pedestrians walking up and down the steps during working hours. The spot is one block away from the Stock Exchange, so you should get the idea. Come after 8 P.M. or on a weekend.
Location: Pine Street between Nassau Street and William Street. Take the J or Z to Broad Street, and skate north on Nassau Street (Broad Street turns into Nassau Street) for one block. Make a right on Pine Street and the spot is in the middle of the block, on the north side of the street.
Pictures (Click to Enlarge):