Need more context....valuation of used cars is a highly imprecise art (to put it charitably

)....
P's (and any other brand, ex-F) have generally awful trade-in value anyway....the various published used car values are about as laughably accurate as JDPowers surveys for statistical/real-world relevance....resale values of cars (even premiums over MSRP commanded by hot cars like 599) are rather lumpy, dpdg upon finding "greater fool" to pay whatever price for a used, discretionary car; seasonality; state of local economy, etc etc

Also depends upon one's relationship w/dealer (a profitable cust who buys/trades-in many cars freq at a dealer prob gets different pricing than a one-off cust)....but would assume poor value, esp if one is in a non-competitive urban region and has lim relationship w/dealer....
I tend to both lease and trade-in prob 4-6 different P/F/AMG every yr at my usual dealers; have excellent relationships w/exemplary dealers; and am always amused by how unpredictably good/poor trade-in values can be, based upon a myriad of factors (F's have 100% trade-in value, but P/AMG can be rather variable).....