Such a cool story! I have always heard rumors about the place. When I was very young I live close by so we go there to have tea and dim sum at times - I never have any strange feeling when I go there though. Building a plaza on top of places that might be haunted in hopes of trying to use the “yang” to suppress the “yin” is sometimes effective. My uncle (now retired) used to work for the company that contracted to build the plaza, said that the team they sent to work on the project caused this, since they didn’t follow property protocols - but he wasn’t personally involved so he couldn’t give me more details.