The mystery location of a fundraiser for President Donald Trump's re-election was revealed Wednesday night.

Attendees, including guests of honor Donald Trump Jr. and former San Francisco first lady Kimberly Guilfoyle, were spotted arriving at 1001 California Street near the Fairmont Hotel.

Socialite and philanthropist Dede Wilsey and Giants part-owner Debby Magowan were among the hosts, according to an invitation to the event posted by San Francisco Examiner reporter Joe Fitzgerald Rodriguez. Tickets for the cocktail reception ranged from $1,000 for a single ticket to $15,000 per couple with a photo opportunity to $35,000 per couple for the "Team 100 Membership."

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Leading up to the event, the location was kept under-wraps to prevent protests.

"Some ugly things have happened recently to the Trump family and I think they'd like to avoid that," John Dennis, the chair of the San Francisco Republicans, told ABC7 News.

Guilfoyle is the ex-wife of California Governor Gavin Newsom and previously lived in San Francisco. She's now dating Trump Jr.

This story was updated at 10 a.m. on July 18, 2019.

Amy Graff is a news producer for SFGATE. Email her at