I've lived in Florida for over 25 years and have inspected a number of aircraft inside and out from right on the ocean to deep inland in Kentucky, and I find the touted affects of "salt air" to be highly exagerated! There are exceptions both ways, but corrosion is a possible issue on every airplane, and most do have at least some, even if only surface frost or filiform! No assumptions can be made either way based on location alone. If I had $20K or $25K laying around, I would definately be looking more closely at this probable bargain!
Would I look for corrosion? Of course! Would I expect to find it? Not necessarily!