Is there really a Fang Shu Zhai in history?

There is indeed Shu Fangzhai in history. In Qiong Yao's novel Princess Zhu Huan, Shu Fangzhai is the residence of two princesses in the palace.

Shu Fangzhai is located in the east of China Palace in the Palace Museum. Originally the director of five research institutes in western Jiangxi, it was founded in the 18th year of Yongle in Ming Dynasty (A.D. 1420). After Emperor Qianlong of the Qing Dynasty ascended the throne, he changed the West Second Palace into the Chinese Palace, so he changed his face to Shufangzhai, and built a stage in the Chinese Palace as a place for banquets and performances.

Shufangzhai is an I-shaped temple, with two main halls before and after, which are connected by one main hall. Among them, the front hall, the south room and the east-west annex hall form an independent small courtyard, which is connected by a veranda. The front hall is five rooms wide and three rooms deep, with yellow glazed tiles resting on the top of the mountain, air doors installed on the front eaves, and the rest are sill windows. The indoor lighting room and the secondary room are separated by floor-to-ceiling flower covers, made of nanmu, which is very fine. The East Second Room, named "Jingqixuan", was appointed in the seventh year of Qianlong (AD 1742) and was the place where Li Hong studied when he was young.

Shufangzhai was the place where Emperor Qianlong rested and held banquets. During the Qianlong period, every year, Emperor Xinzheng went to Xiyuan Chanfu Temple to burn incense, and then went to Shufangzhai to write a blessing to the minister to show his blessing. On major festivals and auspicious days, such as longevity festival, holy birthday festival, Mid-Autumn Festival and New Year's Eve, Empress Dowager Cixi often attends the Empress Dowager's dinner and plays in the back hall, and holds a banquet in honor of princes and ministers to express her congratulations.