Probably a little more, but even so, that doesn't make him a rental, or too expensive. There wasn't some massive rush to get this deal done today. They had another 24 hours before the deadline wrapped, and they have an entire offseason ahead of them.
If you just love this particualr deal, ok. It sounds like they could've held out for an actual overpay and gotten equivalent value this offseason if they were intent of moving Duran.