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I would be leery of doing business with anyone wishing a blessing removed from a building.
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Well, I figured that since I was selling the building that I could not control the activities of the new occupants and that I wanted to be able to say that I had no connection to their “sins” committed in a blessed building. The church was OK with it and the Priest did bless the demo crew that was on-site, waiting to start work, at their request. I have a clear conscience in the matter and the church did well on the sale.