My office (422) is located in the Engineering building (Bldg 1103) at the north-east corner of the Bar-Ilan University.  Here is a map, on which my building is marked with a circle.

Directions to Bar-Ilan Univserity

From the north: For those coming from the north, you should be arriving on Highway 4 (Gehah Road) southward. If you arrive at the Morashah interchange, go southward and after 15 kilometers, when you see the Bar-Ilan bridge, take to the right lane of the Bar-Ilan interchange, to cross over a bridge above Highway 4 going left towards Bar-Ilan.

From the south: For those coming from the south, you should be arriving on Highway 4 (Gehah Road) northward. If you arrive at the Ganot interchange, go northward (in the direction of Haifa) and after the Aluf Sadeh interchange stay straight on the right lane leading to the Bar-Ilan interchange and then take right towards Bar-Ilan.

From Jerusalem and Ben-Gurion Airport: For those coming from the east, you should be arriving on Highway 1 (Jerusalem-TA Road) westward. If you arrive at the Shapirim interchange, go northward (in the direction of Haifa) on Highway 4 (Gehah Road) and after the Aluf Sadeh interchange stay straight on the right lane leading to the Bar-Ilan interchange and then take left towards Bar-Ilan.

Map at Google Maps