If you enter on Harrison, walk straight ahead down the corridor. Take the elevators up to the 1st floor. Immediately to the right as you exit the elevators is the Computer Science Department.
If you enter the City Office Tower from Fourth Ave., walk to the left (past a set of elevators) down a long hallway that connects the City Office Tower to the Fourth Ave Building. At the end of the hallway you come to the elevator foyer and the Computer Science Department is on your right.
From the elevator lobby, Walk through 2 sets of glass doors into Suite 120. My office is 120-04 (on the left) just past the reception desk. The receptionist will be happy to show you to my office.