This has been floating around the internet for some time.
The funny part is that heritage zoning is the reason the addition looks the way it does. The upper floor was inaccessible and stairs needed to be added. Local regulations state that any additions must be visually distinct from the original structure so this monstrosity was the result.
Look up Caldwell Tower in Scotland for more information.
Here is the episode of The Restoration Man that documented the project - they go into the planning side of this in-depth because it’s really a head-scratcher. The owner tried many times to get planning for more subtle alternations but they kept getting knocked back because it has to be distinctive enough that it’s clear what is the old building and what are the new additions. What you see is the result of that messy process.
That’s dumb as fuck, literally even if it was brick you’d be able to tell from the weathering of the original stone. NIMBYs are fucking idiots.