government office; government agency
Rare and formal term for a government office or agency. In modern Japanese, 官衙 (かんが) is a more common kanji compound for this meaning, and 役所 is the everyday word.
See also: 官衙
The notation '官廨' can be found in old documents, but it is hardly used today.
The kanji 官 means 'government' or 'official', and 廨 means 'government office'. The exact historical derivation is uncertain, but the compound is a classical Chinese term for a government building or agency.