Contact and Map
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Train
From main station of Zurich:

Tram No. 6 (direction Bahnhof Enge)/No. 7 (direction Wollishofen)/No. 13 (direction Albisgütli) to station Paradeplatz, following 5 minutes of footpath, or
Tram No. 11 (direction Rehalp) to station Börsenstrasse, following 3 minutes of footpath
Timetable: www.sbb.ch/en and http://www.zvv.ch/en/
Car
via Stadthausquai
Car parks: http://www.pls-zh.ch/geb_2.jsp?gebid=2
Airport
Via train and tram, in 25 minutes (look at the links for train connections above)