A luxury car made by Chrysler, from 1983-1989. Had a V8 engine and a comfy interior. While not technically a full-sized car, it was the biggest car Chrysler made in the 80's. The boxy styling dated back to the 1977 LeBaron and was just given minor styling updates with a Fifth Avenue badge.
The Chrysler Fifth Avenue was probably the best thing Chrysler offered in their 4 banger "K car" obsession during the 80's. You can get them cheap now, and theres alot still driving around.