A spot on the Atlantic City Boardwalk where movie stars, athletes and rock stars used to party — and a now former president honed his instincts for bravado and hype — was reduced to a smoking pile of rubble this week.

The former Trump Plaza casino was imploded after falling into such disrepair that chunks of the building began peeling off and crashing to the ground.

A series of loud explosions rocked the building around 9 a.m. on Wednesday, and it started to collapse almost like a wave from back to front until it went straight down in a giant cloud of dust that enveloped the beach and boardwalk. Overall, it took the structure less than 20 seconds to collapse.

The removal of the one-time jewel of Donald Trump’s casino empire clears the way for a prime development opportunity on the middle of the Boardwalk, where the Plaza used to market itself as “Atlantic City’s centrepiece.”

“The way we put Trump Plaza and the city of Atlantic City on the map for the whole world was really incredible,” said Bernie Dillon, the events manager for the casino from 1984 to 1991. “Everyone from Hulk Hogan to Mick Jagger and Keith Richards, it was the whole gamut of personalities. One night before a Tyson fight, I stopped dead in my tracks and looked about four rows in as the place was filling up, and there were two guys leaning in close and having a private conversation: Jack Nicholson and Warren Beatty.

“It was like that a lot: You had Madonna and Sean Penn walking in, Barbra Streisand and Don Johnson, Muhammad Ali would be there, Oprah sitting with Donald ringside,” he recalled. “It was a special time. I’m sorry to see it go.”

To complete the implosion, demolition crews positioned explosives at strategic points along the building’s support structures designed to knock its legs out from under it, bringing the building down on itself.

Though the former president built it, the building is now owned by billionaire Carl Icahn, who acquired the two remaining Trump casinos in 2016 from the last of their many bankruptcies.

Opened in 1984, when Trump was a real estate developer in his pre-politics days, Trump Plaza was for a time the most successful casino in Atlantic City. It was the place to be when mega-events such as a Mike Tyson boxing match or a Rolling Stones concert was held next door in Boardwalk Hall.

The casino even had a cameo in the film “Ocean’s Eleven.” When George Clooney and Brad Pitt recruited actor Bernie Mac’s character to help with a Las Vegas casino heist, they plucked him from Trump Plaza, where he was a dealer.

Bob McDevitt, president of the main casino workers’ union, said the place oozed glamor and buzz when it first opened.

“When there was a Tyson fight, it was like New Year’s Eve all over the city, massive traffic jams,” he said.

But things began to sour for Trump Plaza when Donald Trump opened the nearby Trump Taj Mahal in 1990, with crushing debt loads that led the company to pour most of its resources — and cash — into the shiny new hotel and casino.

“The moment that the Taj Mahal opened up, it began a decline for the Plaza,” McDevitt said. “In order to make sure the Taj Mahal was successful, they shipped all the high rollers from Trump Plaza and Trump’s Castle to the Taj, and they really didn’t invest in the Plaza much.”

The Trump Taj Mahal, one of the casinos acquired by Icahn, has since reopened under new ownership as the Hard Rock.

Trump Plaza was the last of four Atlantic City casinos to close in 2014, victims of an oversaturated casino market both in the New Jersey city and in the larger northeast. There were 12 casinos at the start of 2014; there now are nine.

By the time it closed, Trump Plaza was the poorest-performing casino in Atlantic City, taking in as much money from gamblers in 8-1/2 months as the market-leading Borgata did every two weeks.