These expansions to the base game are available in the Spielbox magazine "Der Knizia Almanach I" and 6/06.
They are also available as free download from the Fantasy Flight Blue Moon City support page, and in German from the Reiner Knizia games pages at Cool Stuff.
The tiles are:
Der Knizia Almanach:
- Blue Moon City: Expansion Tile Sets 1 & 2
- Blue Moon City: Zusätzliche Gebäude 1 & 2