Trump also spent $63 million to purchase the bankrupt Atlantis Casino Hotel, separated from Trump Plaza by the Atlantic City Convention Hall, and rebranded it as the Trump Regency, a hotel annex to the Plaza. Trump expanded the Plaza onto the Penthouse site, renaming it Trump Plaza Hotel and Casino East Tower. In 1989, Trump paid $62 million to purchase the neighboring, unfinished Penthouse Boardwalk Hotel and Casino, including a hotel tower that had formerly been a Holiday Inn, and a nearby parking lot. The poor results exacerbated disagreements between Trump and Harrah's, leading to Trump buying out Harrah's interest in the property for $70 million in May 1986. The casino performed poorly, with pre-tax profits of just $144,000 in the first half of 1985. Part of the reason for this is that Harrah's was commonly associated with and attracted low-rolling gamblers, but Trump had built 85 high-roller suites, which were rarely used. Five months after opening, the name was changed to simply Trump Plaza, to avoid confusion with Harrah's Marina. The complex contained 614 rooms, seven restaurants, a health club, a 750-seat showroom and a 60,000 sq ft (5,574.2 m 2) casino, all on a narrow 2.6 acres (1.1 ha) plot of land next to Caesars Atlantic City.

The property opened as Harrah's at Trump Plaza on May 14, 1984.

Trump would oversee the construction, while Harrah's would operate the property, referred to as Harrah's Boardwalk, after opening. Harrah's, the gaming unit of Holiday Inn, joined as a partner a month later. The Trump Organization, a company owned by real estate developer Donald Trump, began construction of the casino in June 1982. Designed by architect Alan Lapidus, it operated from May 14, 1984, until September 16, 2014. Trump Plaza was a hotel and casino on the Boardwalk in Atlantic City, New Jersey, owned by Trump Entertainment Resorts.

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