ICSI is located on the sixth floor of 1947 Center Street. For directions to this building and parking information, please see this.
You are supposed to sign in at the reception desk on the first floor, but if you tell them you are going up to ICSI on the sixth floor, they might just wave you onward to the elevators.
Once on the sixth floor, you can ask the front desk for help finding my office or look for it yourself. When you exit the elevators, my office is in front and to the left of you, across the lobby area.