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Why is the M floor of Xiamen Jinlong Building blocked?

It is not sealed in Xiamen Jinlong building community, but the M floor is the basement of the community. As of February 5, 2022, M layer was in normal use and was not sealed. Jinlong Building was built by Xiamen Housing Construction Corporation with the number 1994. There are two buildings in total, including 246 houses. The residential property company is Xiamen Residential Construction Group Co., Ltd. ..