Why do we board up the windows of abandoned or currently renovating buildings instead of leaving the glass?

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A small apartment building near my house is being renovated and they’ve removed all the windows and doors and covered them with plywood. Presumably there wasn’t a problem with EVERY window, so why take them all out and board them up? I imagine they were intending to replace them, but why take them out as the very first step in the reno?

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