This Old House - Free Spot the Differences

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This Old House

No, not the long-running PBS program, but a falling-down Lisbon structure that even our 15 "improvements" cannot save from eventually caving in.
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The older Java version of this puzzle is available if needed.

Credit: Wikimedia photo by L-Bit licensed under Creative Commons
To view the original image and license: https://commons.wikimedia.org/wiki/File:Lisbon_Old_Building.jpg