The newest “Real Housewife of New York,” Leah McSweeney, is so fed up with the city’s rise in crime and homelessness that she wants Mayor Bill de Blasio out of office.

“No one thinks he’s doing a good job, and he really should step down,” McSweeney, exclusively told The Post Wednesday. “His legacy will be ruining New York City for a good amount of time. He’s just in over his head.”

The 37-year-old native New Yorker and FiDi resident said she reached a tipping point earlier this month after she was nearly attacked in broad daylight while dropping her 13-year-old daughter, Kier, off at Kier’s dad’s house.

“I’m walking out of the building and there was a homeless man walking down the street who was either intoxicated or not well in some way,” she recalled of the incident on Cedar Street. “He said, ‘Do you have a dollar?’ I said, ‘I’m sorry I don’t have any change’ and he went and lunged at me.”

McSweeney — who stars in the 12th season of “RHONY” — was able to jump out of the way and walked as fast as she could in the other direction.

“He was so drunk that it was easy to jump out of the way,” she said. “But what if that was my daughter? I have a f–king pubescent daughter and I’m not letting her walk down the street alone right now.”

Ever since coronavirus hit and FiDi residents cleared out, her downtown streets have grown empty, eerie and unsafe, she said.

“There really is a safety issue in our neighborhood … that’s without a doubt,” she said. “We need leadership at a top level, and, obviously, we don’t have leadership right now.”

One of her qualms with the mayor is that he refuses to open gyms, despite Gov. Andrew Cuomo’s announcement Monday that fitness centers can reopen.

“If businesses aren’t open, people won’t be out walking around, and if they aren’t walking around, the streets will continue to be unsafe,” she said, adding that there are safe ways to reopen gyms.

Determined to demand change, McSweeney vowed to attend a “Build the Block” meeting held by NYPD’s First Precinct Wednesday afternoon to vent her concerns.

“I want to know what I can do to help — that’s why I’m going,” she said. 

Because unlike many of her “RHONY” colleagues — who fled to the Hamptons, including Ramona Singer — she’s here to stay.

“I refuse to leave — I’m not going to let that happen,” she said. “Instead, I want to help build this city back up again.”