You would actually take exit 15E and go toward Route 1 and 9 North-heading toward Jersey City. Merge onto 1 & 9 North (truck lanes) and stay right.
Stay right to 440 S. Then slight right on Irving Heir Circle, stay straight onto Culver. Next, make a left on West Side Ave and a left onto Grant.
I think the office is #333.

This is obviously coming south to north.