WASHINGTON — It was billed as a major press event at Philadelphia’s Four Seasons but a briefing by Donald Trump’s lawyers was mercilessly mocked when it emerged the venue was not the plush hotel but a suburban garden center next to a sex shop.

The confusion began when Trump took to Twitter while golfing Saturday to announce an imminent “lawyers” news conference at the Four Seasons, Philadelphia.

Trump quickly clarified, however, saying the “big press conference” would be at Four Seasons Total Landscaping, a family business between a crematorium and an adult book store on the outskirts of Pennsylvania’s biggest city.

The event — in which the outgoing president’s attorney Rudy Giuliani pressed Trump’s baseless claims about voter fraud in the election Tuesday — featured on “Saturday Night Live,” and wags took to social media with their own wisecracks and memes.

“I could write jokes for 800 years and I’d never think of something funnier than Trump booking the Four Seasons for his big presser, and it turning out to be the Four Seasons Total Landscaping parking lot between a dildo store and a crematorium,” Emmy-nominated US comedy writer Zack Bornstein tweeted.

“The real hero today is whoever answered the phone at Four Seasons Landscaping and offered no clarification whatsoever until it was too late,” added author Geraldine DeRuiter.

Trump’s tweets also prompted the similarly named luxury hotel to distance itself from the president’s event.

“To clarify, President Trump’s press conference will NOT be held at Four Seasons Hotel Philadelphia,” management tweeted ahead of the press conference.

“It will be held at Four Seasons Total Landscaping — no relation with the hotel.”

To pile ignominy on farce, the press conference got going the very moment US news networks were announcing that Trump had lost the presidential election after four days of ballot counting.

Giuliani, informed of the news by reporters, responded: “Don’t be ridiculous.”

“Trump won’t concede… Networks don’t get to decide elections,” he added.