By Bus: Take bus number 68, 66, 14, 35 from the Jerusalem central bus station or bus number 7, 9 from the city center, get off the bus at The Hebrew University, Edmond J. Safra Campus, Givat Ram, and walk to the Levin (or other relevant bldg, as on the map below).
By Car: When using the the standard entrance (coming to the main Jerusalem entrance) use the Jerusalem municipality map linked below or the one found here. Within the campus, park either below (to the east of) the Levin/Kaplun/Dancinger-B/Marks bldgs, or above Beit Belgia. Don't forget to ask in advance for an entrance permit from your host within the university.
The Racah Institute is spread over several buildings. The Institute secretariat is located at Levin bldg. The map includes:
Not shown on the map:
Popick (located between the Natl. Library and the Administration Bldg.)