Glitch on Freeside
My interpretation; personally unverified.
The building by Mick & Ralph's sometimes causes a glitch. Stand facing one of the corners and walk forward, hitting the Pip-Boy at the same time. You will fly all the way up the corner of the building and be above it. Sometimes it will even put you on top of the Lucky 38.
Not only are they not talking about the building itself, but it's the building by M&R's.