I see it all the time.
I walk into an older pole type shed and the vastness of it can be awe inspiring.
People are all ready looking at all the room they have for big boy toys.
But, you must look close.
Many older pole sheds when they were built did not have the best water proofing of the posts.
Yes, they lasted as long as the manufacture said, but now are failing.
I showed an older barn from the 80's. 22 posts and 8 of the were rotted over 75%. 5 more about half.
This make that shed very unstable. Can t be fixed, yes, at about $150 per post.
Unless you are a great do it yourself-er...it may be best to pass on this one.