People who have been trained to climb have remarkable ability. Here's Jon Hojer doing something called "front lever", suspending his entire body from the tips of his little fingers, from a training device called a Beast Maker.
If someone one like me can climb a building you'll need to make changes to the building. But if someone trained in climbing can get up the building you might need to look at how easy it is for them to do and see if changes can be made, but at some point you're spending ever increasing amounts of money for smaller returns and you need to switch focus to building therapeutic relationships
That comes from a video which is here: Jon Hojer