Wish I could take credit for moving it ALL by myself, but what I did was go to the building's Security desk, fix the nice young man with the "Mommy" look and ask him what I should do to get the file cabinet moved from one floor to another during regular business hours. He immediately offered to help me, produced a dolly, and voila! the file cabinet was moved. When you're young and cute you can get men to willingly help you; when you're an old broad like me, you can achieve the same result by use of The Piercing Gaze and The Mommy Voice. Whatever works.
Now, to give myself credit, I did move the [expletive deleted due to Rule #3) convention booth canisters by myself so, yes, you're right -- I ain't no cream puff.