The fact it dropped a couple of weeks ago is a good indication of its current value. Therefore, it seems logical if you have received any offer at or above regfee for this simple typo of mortgage, especially in such an inferior and subordinate extension, and just two weeks after you registered it, take the money and run. Chances are you will most likely be stuck with the renewal each year if you turn it down or hold out for more. Congrats on the offer, and best of luck with the sale.
-Regards