The Grand Postal Building established in the 1st March1935, the era of King Ananda Mahidol. The 70-year building was the centre of the post and telecommunication services. And it was once used to be the Post and Telegraph Department head office.
The T-shaped building was designed by Thai architect Jit Sen (Mew) Aphaiwong who was also designed the Dome Thammasat University and Supachalasai Stadium.
The building was designed according to old European architectural styles, providing total spaces of over 25,369 square meters comprising four-storey with a basement, built in a combination of Neo Classicism and Functionalist styles.
The building is decorated with stucco mouldings depicting mythical Garuda birds, in the two frontal corners, and two stucco mouldings made in the form of the Seal of the Post Office on each side of the four walls of the main hall (Postal Heritage Hall) on the ground floor, making eight seals in total. The 8 bas-relief sculptures in the reign of King Rama V to King Rama VIII created by the students of Professor Silpa Bhirasri located in the Postal Heritage Hall.
The building was completely finished on 11 March, 1939 and officially opened on 24th June 1940 by General Phraya Phahon Phonphayuhasena.