By 1958, his rebuilt project claimed its first prize — the coveted “Best of Show” award at the prestigious Pebble Beach Concours d'Elegance in California.

Instead of a warehouse, he decided to develop a personal six floor, ten-story-tall Art Deco penthouse palace that will serve duel-purpose as a free of charge museum when he was not living there, and in 1971 the San Sylmar tower estate was constructed.

The fourth floor also features a Louis XV-styled dining room and a large private kitchen that J.B. used for private dinners with French personal chef Yvon Hunckler, who previously cooked for The Beverly Hills Hotel, Grand Hotel Birmingham, and Hôtel de Paris in Monaco.

[13] The fifth floor has a theatre which includes a 24 karat gold proscenium arch next to a massive storage room of pianos and musical records.

The San Sylmar estate was one of the largest houses in the United States at 60,000 square feet (5,600 m2) and the entire Nethercutt Collection as a whole was 90,000 sq ft (8,400 m2) with the workshops.

[8][2] In 2000 the Collection expanded and constructed a new 40,000 square foot display building directly across the street which was separately called the Nethercutt Museum.

[24] The Nethercutt Collection has over 250 prestigious, antique, and exotic vehicles from American and European origin, notably including from Aston Martin, Austin-Healey, Bentley, Bugatti, Cadillac, Duesenberg, Ferrari, Lincoln, Maybach, Mercedes-Benz, Porsche, Rolls-Royce and others.

[25] Several vehicles in the Collection were formerly owned by politicians and celebrities such as Abdullah Al-Salim Al-Sabah, Marjorie Merriweather Post, Fatty Arbuckle, Tim Allen, Constance Bennett, and others.

[4][5] The Nethercutt's 30,000 square-foot auto restoration and detailing complex is credited with being one of the finest in the world, with nearly all of the vehicles on display being in pristine condition and fully drivable.

[37][38] From 2008 to 2010 the Collection's vehicles served as the lead car and transport of the Grand Marshals of the Rose Parade, including Emeril Lagasse, Cloris Leachman, and Chesley Sullenberger.

The event was one of the most exclusive items on any car lovers wish list as Autoweek magazine described it, "You can be as rich as Bill Gates or have a collection as big as that of the Sultan of Brunei, but you don't get a personal invitation from J.B. Nethercutt himself."

Automotive historian Jay Leno described the Collection as a "Smithsonian-style effort on the history of transportation in America" and "The hall of fame for cars.”[45] The Royal Hudson steam locomotive No.

[50] Many of the collection's vehicles have been featured on the CNBC series Jay Leno's Garage; the Bugatti Dubos, 1933 Hispano-Suiza J12, 1930 Cadillac V-16, 1928 Isotta Fraschini Landaulet Type 8A, 1967 Ferrari 365 California Spyder, the Twenty Grand Duesenberg, and 1923 McFarlan Knickerbocker Cabriolet Model 154.