Theater Puget Sound's Studio 4 is located in Seattle Center House on
the Seattle Center campus. The street address is 305 Harrison, but
that's not actually very much help in reality. A map can be found
here:
http://www.mapquest.com/maps?city=Seattle&state=WA&address=305+Harrison
(It's not all that helpful.)
If you park on the outskirts of Seattle Center and walk onto the
campus you can find Seattle Center House right smack in the middle of
things. It's the building with the food court. It's kitty corner from
the big fountain and across from memorial stadium.
Numbers 33 - 36 on this map:
http://www.seattlecenter.com/Information/map.asp
(This one is actually somewhat helpful.)
When you get into the building make your way up to the 4th floor.
There will be signs to guide you from there. The theater is through
the double doors and down the long scary hallway. If you feel like
you're walking into a horror movie, you're on the right track.