delegation — A delegation is a group of people who have been sent somewhere to have talks with other people on behalf of a larger group of people.
deputation — A deputation is a small group of people who have been asked to speak to someone on behalf of a larger group of people, especially in order to make a complaint.
residence — the place, especially the house, in which a person lives or resides; dwelling place; home: Their residence is in New York City.
commission — If you commission something or commission someone to do something, you formally arrange for someone to do a piece of work for you.
ministry — the service, functions, or profession of a minister of religion.
committee — A committee is a group of people who meet to make decisions or plans for a larger group or organization that they represent.
adjective embassy
diplomatic — of, relating to, or engaged in diplomacy: diplomatic officials.