This location is set back away from the street, so you should park before the yellow strip and walk towards the large gate. The building has the A.T. sign by the door, trust me it’s back there! My son always loves it when Thornhill is closed because he gets to come to Montclair Adventure Time! Out of the three A. T campuses I have been to(Joaquin Miller, Thornhill, Montclair), this one is by far the largest and cleanest. There is a large play area out front and lots of different stations inside for the kids to play. The teachers are always pleasant at drop-off, and it looks like the ratio of teachers to students is good.