When the bank left the building, it turned into some sort of women's insane asylum/home for elderly demented women. In the 90s, some famous guru opened a club here, called The Temple. In 2005 the club closed, and eventually the city got a hold of the building. The name stuck though. They renovated the building and the Temple became the first building on the Dutch heritage list with energy label A.
Today the building is used by the archeology department of the city.
Um 1800 Bewegung means Circa/Around 1800 Movement in German and in architectural sense isn't so far from Traditionalist School. Both were fairly conservative, and both used brick work and dimension stone. The Um 1800 Bewegung only shows a lot more affinity with Louis XIV and Jugendstil, ornaments and decoration, while Traditionalist School has of course none of that. On the outside, Um 1800 buildings are usually as tidy and 'clean' as Traditionalist buildings, but there are a few Jugendstil ornaments here and there, like just above the entrance door of The Temple.
My guess is Bodde just liked no nonsense on the outside, and liked Jugendstil decorations on the inside. I mean, the abovementioned mansion in Wassenaar is in English country house style but also has some stained glass windows.
Anyway, back to the Um 1800 Bewegung. I don't know much more about it, only that nazi (yikes) architect Paul Eduard Schultze was an originator of the movement, and that it was modeled after the German movement 'Goethezeit'. Goethezeit (=Goethe time) was inspired by poet Goethe and is known for its romantic characteristics.
Address: Van Kinsbergenstraat 85f, The Hague
Open to visitors: Not that I know of. They usually are open on the national heritage days though!
How to get there: Take tram 17 from Central Station to Statenkwartier and get off at Van Speijkstraat. From here it's a 2 minute walk.
Website: (in Dutch) http://www.denhaag.nl/home/bewoners/kunst-en-cultuur/archeologie.htm?utm_source=alias&utm_medium=offline&utm_campaign=archeologie