Attached at the southern side of the Nari Samoson Building is the SaengAthit Building, a three-story tower with a spiral staircase leading to the second and third floors. At the top is a door leading outside where, in the past, there were connecting walkways to nearby buildings such as the Phungbun Building. However, over time, most of these structures have been demolished and today, only traces of the bridge appear in the awning over the entrance.
Like the Nari Samoson Building, the SaengAthit Building has been meticulously maintained, undergoing a number of renovations. In 2005, it was also presented with the Outstanding Architectural Conservation Award as part of the Government House compound.