That address number was added by a user who dumped a bunch of misspelled stuff all over Walter Reed. Lots of those items have the same 8901 street address, too. I agree that something appears to be visible on the satellite view, but I wouldn't be surprised either way.

It's unfortunately hard to see through the foliage from street level on the other side of the fence. An official DoD map or someone on the inside would be helpful. Barring that, you have to hope that someone spots the building (or non-building) right after the hedge is trimmed.