here the local prefectural office uses drones to look for "violations" you can hear them but rarely ever see them as they are allowed to fly 50 meters higher as a government entity then normal sport drones. (could be my old age and piss poor eyesight as well though).
about 18 months ago they come up to tell me they were going to tax me for my shop now that it was finished. i pointed to the lack of a proper foundation out to them and said, by current laws it is a temporary structure and not subject to taxation. they were a couple of young government sponges that did not enjoy being told to have a nice day I am not paying.
But (Hat trip to my Japanese buddy for pointing out the correct method of pissing in their wheaties.) I got a letter about 3 months later from a different government office telling me that my shop could not be classified as a living/working space due to lack of proper foundation, they admitted that while it did have poured concrete slabs that might "might" serve as a foundation, they were not up to code and therefore it could not be considered a structure. (I argued the point before them that it should be and I was willingly to pay ...taxes on it )
the two sponges came back a month or two after getting that letter and i then showed them the letter and thoroughly enjoyed the look of consternation at the fact that they had been bufooed by one of their contemporaries in another division.
Tanuki 1/tax pigs 0
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all this to say eventually when they go that route, they will just use drones and tax you accordingly.