The answer to that question is a bit of a judgment call.
If all siding had been replaced, then it would be definitely be considered an improvement that would be depreciated over time. Even replacing some of the siding would meet the definition of an improvement if it results in a betterment to the property or restores it.
You are the best judge to determine whether the extent of the work done would be an improvement or just a repair.
@dafornov
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