The Grand Postal Building was constructed in 1935 on land which was the original location of the British Embassy. It was designed by a famous Thai architect whose work includes some buildings on the historic Ratchadamnern Avenue, among others. The building functioned as the headquarters of the Post and Telegraph Department and became a landmark on New Road in the then new developed commercial area near the Chao Phraya River.
The Grand Postal Building has recently been registered National Heritage Building by the Fine Arts Department. It is now available for private functions in retro-classic ambience for 500 for banquet or 700 for cocktails. Its most notable feature is the architectural style with modern and neo classic influences which were most popular in Thailand during the period of economic decline between the revolution and WWII.