Is it déjà vu, or just a Mirage?

The embattled former site of the Brooklyn Mirage open-air music venue faces yet another race against time — after the “unsafe” structure from last year’s failed opening caused delays for the pricey new nightclub taking over, The Post has learned.

FIVE Holdings, the East Williamsburg venue’s new Dubai-based operator, is set to open the seasonal nightclub at 140 Stewart Ave. as Pacha New York by mid-June, and confirmed to The Post it is building a massive stage elsewhere to speed up the process.

The Brooklyn Mirage successor is already peddling $150 tickets for its opening weekend — a massive increase over the $20 starting price that the Mirage was known for.

Work on the venue’s platform and supports has been underway “off-site” since January, a Pacha New York rep said.

“This is a deliberate, highly structured process and not a last-minute execution.”

The news comes after several eagle-eyed EDM fans posted TikTok videos revealing a near-empty construction site earlier this month.

“I wish I had as much hope about everything else in the world as Pacha NYC does about having this done in 2 months,” one user wrote.

“The issue is not construction,” another pointed out. “The issue is getting the NYC permits and inspections done and approved, and any demands for corrections to be done within two months.”

City inspectors deemed the 32,000-square-foot Brooklyn Mirage too unsafe to open just days before its first scheduled show last May.

A Pacha New York rep told The Post it worked for months to get the proper city permits to demolish the Brooklyn Mirage’s troublesome leftovers — and “as soon as the permit was secured, demolition was completed in record time on April 16.”

“In order to safely demolish the building, the contractors first had to stabilize the unsafe structure,” a Department of Buildings rep said, resulting in a “longer demolition timeline.”

On-site work at the venue began April 17, the Pacha rep said – while ongoing off-site work remains “key to maintaining momentum and meeting our timelines.

“Pacha New York is on schedule, with a built-in buffer to ensure all final inspections and approvals are completed ahead of opening.”

The two-month race to the finish line will have city inspectors assess the completed site no later than mid-May, the new operator said — a move that will give the DOB and the FDNY weeks, instead of days, to check for hazards.

Pacha New York’s inaugural weekend is set to kick off on June 13 before an “official” opening party slotted for June 20 and 21.

More than 12,000 tickets have been sold for this upcoming season so far, despite Pacha New York’s still-pending application to have its liquor license transferred from the previous venue.

But during a public meeting last week, FIVE Holdings founder Kabir Mulchandani told the Williamsburg community board that the site will open regardless of the transfer – and can technically work under the Brooklyn Mirage’s existing license.

“The venue is gonna open either way,” Mulchandani told the board.

The meeting also unveiled Mulchandani’s new plans for the club, including free late-night shuttles to Manhattan and Brooklyn subway entrances; artificial intelligence-powered capacity monitoring and security gates; post-event security patrols and a 21-and-over age limit.

The CEO also vowed teams would clean the surrounding streets of trash after events, and contended his $2.5 million “fully-directional” sound system will bring a “50 to 75%” reduction in noise emitted into the streets.

But some Brooklynites are still wary of the operator’s ability to clean up after thousands of nightly attendees and temper its booming bass until the wee morning hours.

“I’ve really seen what these clubs do to the neighborhood,” Brooklyn mom Karina, who lives near the venue, told the board.

“These people come in from other communities and they basically trash the neighborhood … The sound that came from Brooklyn Mirage caused a lot of issues at school for my children, as they did not get the sleep they needed.

“The sound mitigation that you talked about sounds great,” she said, “but I’ll believe it when I see it.”