From the 110:
Jump off at 4th Street. Take 4th to Olive and turn right. You’ll have to turn right onto 5th Street then immediately left on Grand. The parking is on your left.
From the 101:
Exit Grand Street South and take it just past 5th, left into the parking.
If you are taking the subway (Metro):
Get off the red line at Pershing Square. It is a block away on 5th and Hill Street.