Further east in the inner court is situated the beautiful Siwalai Garden. When King Rama II had the Palace precincts expanded towards the south, he ordered three Golden Hall and many European and Chinese style buildings to be constructed. This new area was called “garden to the Right” because it is situated on the right side of phra Maha Monthian.

Mahitsara Prasat

          Situated on the wall between the inner court and Siwalai Garden is a small one storey building on a raised base with four porches. The northern and southern porches are linger than the eastern and western ones. Its roof culminates in a seven tiered spire. On the four corners of the lower part of the spire are mouldings of Garudas holding Nagas. The niches above the door and windows are in the shape of spired roofs.

          Mahitsara Prasat was dedicated to king Rama III and his relics were enshrined here. They were later moved to the Ho Phra That Monthian and Mahitsara Prasat now houses various images of the Buddha.

Siwalai Maha Prasat

          Situated at the south eastern corner of Siwalai Garden within the inner compound of the court is an edifice with five Prasat spires. These spires are in Mondop style with seven tiers, built during the reign of King Rama V, to enshrine the statues of four previous kings, which had been forcasted in 1869.

          Later King Rama VI had the statues transferred to Prasat Phra Thep Bidon, in the Temple of the Emerald Buddha and commenced the ceremony of paying homage to the statues on the 6 th April in 1918, which is observed annually up to the present time. Since then Siwalai Maha Prasat has been left vacant.

Sitalaphirom Pavilion

          At the edge of the lawn, north of Phra Phuttha Rattanasathan and behind Boromphiman Mansion , is a small open pavilion made of wood. The carving on the gable represents King rama VI's insignia surrounded by a stylized flame motif in gilded black lacquer. The floor is covered with wood raised slightly above the ground. King Rama VI build it as a place for his private response and as a seat during open air parties. At present the king sits there when he gives a garden party on his birthday for high ranking government officials.

Rattanasathan

          In the center of Siwalai Garden is an Ubosot (Ordination Hall) of grey stone with a two tiered roof covered with green tiles. In front of it there is a recessed portico. Around the building runs an open pillared gallery. The niches above the doors and windows are in the shape of crowns.

          Phra Phuttha Rattanasathan was built during the reign of King Rama IV to install the image of the Buddha called Phra Buddha Butsayarat which brought from Champasak in Laos . The building has been used by the king for some Buddhist rituals including ordination ceremonies.

Boromphiman Mansion

          To the north of Siwalai Garden once stood the palace arsenal. King Rama V ordered it pulled down to make way for a two storey European building with grey slate roof. He called it Phra Thinang Phanumatchamrun and planned to give it to the Crown Prince, H.R.H. Prince Maha Vajirunahis who died before it was completed. When H.R.H. Prince Vajiravudh became Crown Prince he did not stay here. Only after his ascension to the throne did he come to stay here occasionally and changed its name to “Boromphiman”, after building of that name which had been pulled down.

          Prior to his coronation, King RamaVII came to stay here for some time. King Rama VIII took residence here together with his younger brother and mother when they returned from Europe in 1946. King Rama VIII passed away in this mansion. Since his tragic death it has been little used. It has now been repaired and serves as a guest house for visiting royalty and heads of states.