Mike Bloomberg's failed presidential campaign cost him over $500 million. Here are some of the things the billionaire spent money on, from free booze and NYC apartments for staff to catered events for supporters.

The electronics were purchased to improve the campaign's cybersecurity, representatives told The Times.

Staffers were offered full benefits packages and stays in fully furnished apartments on Manhattan's Upper East Side, The Times reported.

Bloomberg himself lives in a five-story townhouse in the same neighborhood, which he bought in 1986 for $3.5 million. At the end of his last term as mayor, the billionaire spent at least $1.7 million renovating the home. Zillow estimates its value at $17.7 million.

Bloomberg's national campaign headquarters has an on-site cafe that feeds everyone, according to The Times. It served both pizza and tuna steak on one night in February, according to New York Magazine.

Staffers also got free booze, New York Magazine reported.

The campaign's Federal Election Commission filings revealed that it spent $16,000 at a Manhattan sushi restaurant and another $200,000 on catering from FLIK Hospitality, The Times reported.

Bloomberg served wine, beer, and goat cheese puffs at a New York City rally in January, in addition to renting out a hotel ballroom and hiring a DJ for the occasion, The Times reported.

The former mayor served cheese steaks, hoagies, and cheese boards with honey-coated brie, fig jam, and flatbreads at a different rally in Philadelphia in February, according to The Times.

The shirts, which were laid out for anyone to grab, had a variety for pro-Bloomberg slogans including "I Like Mike"; "Women for Mike"; and"Ganamos con Mike," The Times reported.

Some of Bloomberg's canvassers were being paid $6,000 a month while other campaigns didn't pay canvassers at all, one campaign worker told New York Magazine. They also got to take advantage of some of the higher-ranking employees' perks.

The billionaire's campaign recruited smaller influencers to create original content for the team, the Daily Beast's Scott Bixby reported. Bloomberg's campaign offered a fixed $150 fee to produce social media posts that "Show+Tell why Mike is the candidate who can change our country for the better [and] state why YOU think he's a great candidate," according to a post on influencer marketplace Tribe, Business Insider reported.

Meme accounts dropped sponsored posts promoting Bloomberg en masse, as first reported by the New York Times' Taylor Lorenz. Each account posted a screenshot of what appears to be an Instagram direct message conversation with Bloomberg, in which he requests a sponsored post, or shares a dad humor-type joke, or flaunts his net worth, Business Insider reported.