You can take the tramline 17 or 18 towards Rikshospitalet. Depart at Universitetet Blindern.
Walk through the campus until you get to the main square. Georg Sverdrups hus is the tall building to your left.
Take line 3 (Sognsvann), line 4 (Ringen) or line 5 (Storo) westbound, to Blindern station, from Oslo Central Station or any other subway station at the city center. When you leave the train, walk up the hill and cross the street (Problemveien). Continue walking in the same direction,. Georg Sverdrups hus is the first tall building in front of you.