The most luxurious of the GM Mororama dream cars for 1954 was the elegant four-door Cadillac Park Avenue.

Like all the fabulous dream cars from General Motors for the 1954 Motorama, the Cadillac Park Avenue made its public debut on January 28 at the Waldorf Astoria in New York. (See our video feature on the  ’54 Motorama here.) The big Cadillac was easily the most luxurious of the class of ’54, constructed on a massive 133-inch wheelbase chassis borrowed from the Series 60 Special production car. The two other Motorama Cadillacs for 1954, the El Camino and the Espada, were sporty two-seaters sharing a cut-down 115-inch wheelbase.

And like most of the Motorama fleet that year, the Park Avenue was constructed in fiberglass but finely detailed to look just like a new GM showroom product, with a full interior in gray leather. “Enhanced by the dark Antoinette Blue exterior trimmed with bright chrome and topped with a hand-brushed aluminum roof, ” the press releases declared, “Cadillac’s Park Avenue fiberglass bodied four-door sedan has an exciting quality of beauty gained from a restrained yet dynamic futuristic styling.”

While the tail fins and tail lamps of the Park Avenue recall Harley Earl’s 1951 GM LeSabre, the rest of the exterior featured all the familiar Cadillac styling cues of the period. Unlike the Espada and El Camino with their advanced four-headlamp front ends, the Park avenue featured the traditional two-headlamp setup found on production Cadillacs.

A number of the Park Avenue’s exterior design elements would later be found on the 1957 Eldorado Brougham production car, including the brushed-metal roof—aluminum on the Park Avenue, stainless steel on the Brougham. The fiberglass four-door was reportedly scrapped once its Motorama career was over, but the Park Avenue name would reappear on the short-deck DeVille of 1963. But the Park Avenue badge at GM is most commonly associated with Buick, where it was used from 1975 to 2007