Every single parking space in the Caldwell House building's parking lot is assigned to someone. DO NOT park in the parking lot unless the person you're visiting moves their car elsewhere so you can park in their space.
Cars that park in someone's assigned space without permission will be towed.Street parking
FYI, you can not park on the street in Caldwell for more than ½ an hour between 2am and 6am. You should call the police department (973-226-2600) to verify that this is still the case, and to get permission to park then if necessary.
Directions to Caldwell House are: here