Why is it said that the Prince Gong's Mansion encapsulates half of the Qing Dynasty's history?

Construction: The Prince Gong's Mansion was built during the Qianlong period of the Qing Dynasty, originally as the residence of He Shen. He Shen, of the Manchu Niohuru clan, originally named Shanbao, was historically known for his diligent study habits and photographic memory. Not only was he academically gifted, but he was also extremely handsome, which greatly endeared him to Emperor Qianlong. He Shen rose from an ordinary guard to positions such as Vice Minister, Minister in attendance to the Emperor, Chief Minister of deliberative discussions, Minister over the Guards, Commander of the Infantry, and Grand Minister of State Affairs, while also holding concurrent positions as the Minister of Revenue, Minister of Personnel, and Minister of War, becoming a powerful favorite of his time. Around the 40th year of Qianlong's reign, Grand Scholar He Shen chose the site of Prince Gong's Mansion for its surrounding waters, proximity to the Western Hills, and closeness to the Forbidden City, purchasing the property at a high price to construct the famous 'He Residence'. Change of Ownership: After He Shen was executed for corruption during the Jiaqing reign, his private residence was given to Prince Qing Yonglin, who was said to 'love his residence more than the empire'. In the fourth year of Jiaqing (1799), He Shen's residence was bestowed upon his brother (Qianlong's seventeenth son) Prince Qing Yonglin, thus becoming Prince Qing's Mansion. In the twenty-fifth year of Jiaqing, Prince Qing Yonglin passed away, and the residence was inhabited by his descendants. Transition: During the Tongzhi reign, because Prince Gong Yixin played a significant role in a coup d'état alongside Empress Dowager Cixi, she gifted the residence to him, henceforth known as 'Prince Gong's Mansion'. Destiny: In the early years of the Republic of China, the mansion was sold by Prince Gong's grandson Pu Wei to a church, and later redeemed by Fu Jen Catholic University to be used as a girls' school. After the establishment of the People's Republic of China, the mansion was used by various entities. In 1986, following the principle proposed by central leadership of 'relocating, restoring, and opening up simultaneously', the relocation and restoration of the garden were largely completed. In 1988, the garden of Prince Gong's Mansion was officially opened to the public, and after the completion of the mansion's restoration in 2008, it was fully opened to the public. This historically illustrious mansion, which has witnessed the reign of seven emperors of the Qing Dynasty—Qianlong, Jiaqing, Daoguang, Xianfeng, Tongzhi, Guangxu, and Xuantong—and the historical process from the dynasty's zenith to its decline, continues to narrate its history to posterity.