This is the term I decided to go with, though Seika's answer also gave more specific examples. Thank you very much, everyone! 4 KudoZ points were awarded for this answer
Explanation: I think people are putting too much into the fact that you see 公館 with 在外 a lot (definitely in Eijiro). Nothing in what the asker says has anything to do with overseas. In general, it's a government/public building.
Can Altinbay United States Local time: 15:01 Native speaker of: English, Japanese PRO pts in category: 16