First (ever) offer for FL Rental Property - $345 Admin Fee?

[Bryant T.]

I was about to sign a contract for my first ever offer on a Florida rental when I read the last line of the offer contract saying "Buyer to pay ____ (brokerage name)___ $345 fee at Close"

When asked, agent said it was for storage/document fees, and very standard across all firms. I've never had to pay an "admin" fee to my agent's brokerage as the buyer. Appraisal, inspections, sure...but this seems odd. Is this a Florida thing? Or ...?