If signage can be bypassed and not seen as the 2nd floor folks go up, I'd post up there simply because it's easy to do, easy to maintain and you never have to justify it when there is an issue or regulator questioning it.
Some signage isn't required on each floor though, like items you'd often have on the Fed Wall, i.e. HMDA and CRA as examples. The second floor isn't a separate branch, I assume. Equal Housing and HR posters may be good duplicated especially if seeing them on the way up isn't likely.
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell