The Torentje, located at the Binnenhof in The Hague next to the Mauritshuis museum, has been the official office of the Prime Minister of the Netherlands since 1982.
Wikipedia https://en.wikipedia.org/wiki/Torentje
Address 17 Binnenhof, Den Haag 2513AA, Netherlands
Coordinates 52°4'49.242" N 4°18'50.227" E