The Park Avenue was Buick's flagship sedan. A luxury trim level, the Ultra (1991), was also available throughout the Park Avenue's run. The Buick Park Avenue Ultra luxury sedan featured a more powerful 205-240 hp supercharged V6 that became standard in 1992 versus the regular 170-205 hp V6. Prices for the Park Avenue ranged from $34,705 for the regular Park Avenue and $39,225 for the Ultra luxury trim. (edit this text)