The Phra Pin Building, at Phra Rachawang Deum, i.e. Thonburi Palace. It is named after Phra Pinklao, the younger brother of Rama IV.

In the Rattanakosin Period, Phra Pin Klao was the Uparacha, and this was his residence. In the back, the main Prang of Wat Arun (fig.) is visible.