In 1783, Princess Sofia Albertina, sister of King Gustaf III, acquired the land where another residence for her was to be built. After Princess Sofia Albertinas death in 1829, many royals lived there during the course of time - until 1902, when the State purchased it to use if for the foreign administration.
Today, Arvfustens Palace is the seat of the Ministry for Foreign Affairs. I've attended some social occasions there, and must say that it's a marvelous palace/residence! It has fantastic interiours that are not too much, but very well balanced - and even if I wouldn't mind if it still was a royal residence - it think it suits wonderfully well as the base for the Ministry for Foreign Affairs. and the best room in it is the office of the Minister for Foreign Affairs (who heads the ministry).
Picture 1, 2 & 3 = Arvfurstens Palace
Picture 4 = The Minister for Foreign Affairs in her office (you can see a bit of it in this pic)