How many years does a building in Fengshui run?

In Kong Xuan's geomantic omen, 540 years is called Dayuan, and every 180 years is called Zhengyuan. Zhengyuan is divided into three units, namely Shangyuan, Zhongyuan and Xia Yuan. Each of the three units is divided into three fortunes, one every 20 years. Details are as follows ... Shangyuan Yi Yun 1864-1883 Jiazi-Guiwei Shangyuan Eryun 1884-1903 Shen Jia-Guimao Shangyuan Sanyun 1904-1923. 438+0944-1963 Shen Jia-Guimao Zhongyuan Liu Yun 1964-1983 Chen Jia-Guihai Zhongyuan Yun Qi 1984 -2003 Jiazi-Guiwei Zhongyuan Bayun 2004 -2023 Shen Jia-Guimao Zhongyuan.