Again, this is pretty silly. If an agent led me into a bait-and-switch situation (ie, something advertised as 1400 rsf turns out to be a closet), I'd simply never use them again.
In practice, though, total moot point: the last time I looked for office space (earlier this year), the first agent I called sent me scaled floor plans for over 100 places. There were rsf numbers to go with them, but the dimensions of every office were right there.
Every time I read Wikihow and eHow, I think "I am so glad I wasn't a credulous Middle American retiree googling their medical symptoms.". If your chest hurts, apply honey with Tylenol crushed up into it!
(Non-SEOs may not realize, but health is in the top five categories for search volume on some networks.)
There are mechanisms by which a landlord can raise a rent inside the bounds of a lease. In my experience, multi-year leases have "elevator clauses" that either allow for pre-negotiated upwards adjustments in price based on property tax, CPI, or other measures.