I'm sure you know that not everything in life is as it seems. Nowhere is this more true than in geocaching.
Your search area is the divider between two completely unique medical facilities--which happen to be built at slightly different elevations. Because the area deals with a significant number of patients, some stealth is required. But there is no need to go anywhere that would arouse concern or suspicion. And, if you are lucky, you can actually park within a few feet of the cache. The container is a nano, but it is shielded by a bit of "man-made", though very visible, nature.
Please re-hide the cache in the same spot and manner that you find it.