As you indicated, this is not a closure, per se. The notice at the branch a month ahead will certainly let the regular customers know and a sign on the door directing them to one or more of your others should suffice.
Absent state law, this shouldn't be a huge issue.
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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