You guessed it, it was made in the year 2000. This is a real building, and the photo has not been retouched. Meaning - what you see is what you get. As long as you think about it - because, as often with contemporary art, you might not get much out of it if you don't want to :). For me, it is above all about one guy walking from door to door and convincing his neighbors to do something different, a little strange, crazy and seemingly useless to many of them. The building is the actual building he lives in, in a poor and ugly part of Warsaw. You can read more about the new exhibition, which contains mainly sculptures and films, at NonStarving Artists, a good fine arts site. (For the English version, scroll down or click on..."English":)).
I don't like Althamer's sculptures as much, and don't know his films at all, but I must admit they have something in them:
On the State-owned site culture.pl, you can find a slightly longer Althamer biography.