The Park Avenue was Buick's flagship sedan from 1975 to 1990 as a trim level on the full size Buick Electra and as a distinct model from 1991 to 2005, succeeding the Electra entirely. Its name pays homage to the affluent Park Avenue New York City boulevard of the same name.
Starting in 1989, a new luxury trim level, the Ultra, was introduced and stayed throughout the rest of the Park Avenue's run. The Park Avenue Ultra boasted more standard luxury features (including a 20-way power seat in 1989) and starting in 1992, a more powerful 205hp supercharged V6 engine versus the regular 170hp V6. By the end of the Park Avenue's model run, the supercharged 3.8L engine made 240hp.
The rarest of all factory Buick Park Avenue's is 1975's introduction model, the Electra Park Avenue Deluxe. It was factory-built to include all optional extra features. This special model was expensive and did not sell well. Only 37 were produced, and the Deluxe trim level on the Park Avenue was not carried on for 1976.