The building has two floors with a neo-Venetian Gothic architecture combined with Byzantine art and one staircase. On the roof there is a small shrine to Phra Phrom. Downstairs are three lounges. The first is the Golden Dome Room on the south side of the building for the prime minister's guests. The second is the Ivory Room which is in front of the Golden Dome Room and adjacent to the right, which is a lounge for official visitors of the prime minister. The third is the Purple Room, which is on the ground floor to the right-hand side of the building. This is a lounge for the visitors of the deputy prime minister and other cabinet ministers. The building has a small conference room for the Board of Committees, chaired by the prime minister. The upper floor of the building houses the prime minister's office, the offices of political officers, and the old cabinet conference room.
