Is it a Porsche extended warranty?
There's a high-mileage 550 edition that's been for sale locally and on Ebay for a few weeks at $18,999. Clearly yours is in much better condition and has the hardtop, but I don't know if that would add more than $10k. The last one I saw on Ebay had 23,xxx miles and topped out at ~$22k (didn't hit reserve) if I recall correctly.
If you find the right buyer you may get a premium over the trade-in offer, especially if it's a collector in which case the hardtop will likely help the value.
Personally I'd keep it!
-Tom
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