Bill de Blasio is swapping boroughs. 

The former mayor, a longtime Brooklyn resident, signed a one-year lease on Manhattan’s Upper West Side in the tony Lincoln Square, sources said. 

The Democrat signed a lease for a one-bedroom apartment close to Columbus Circle, a source familiar with de Blasio said, but maintained he’ll always be a “Brooklynite.”

The source said de Blasio “wanted to try something new,” insisting the change is a “temporary thing” and that he’ll still be “splitting time” between his new neighborhood and his Park Slope-based brownstone shared with his wife, Chirlane McCray. 

The pair are not divorced, but they recently announced in an interview with The New York Times that they are separating and will be seeing other people. 

The former mayor will be living alone “in light of changing circumstances,” the source said. 

De Blasio will also continue to use his famed YMCA in Park Slope, as he has yet to try a different YMCA in Manhattan. 

Although the person wouldn’t disclose the pad’s price tag, a report released by real estate appraisers Miller Samuel and Douglas Elliman pegged the average monthly cost of a one-bedroom in Manhattan at just over $4,400.

It’s also close to the West 63rd Street bar restaurant where he was seen with an unidentified woman, as reported by The New York Post. 

The ex-pol came under fire in June when the city Conflicts of Interest Board, the city’s independent ethics body, ruled he misused city resources during his 2019 presidential bid when he spent hundreds of thousands of dollars on the travel expenses for his NYPD security detail. 

The board ordered him to pay the largest penalty handed down against a city official: $155,000 in fines and $319,000 in reimbursements for the cost of travel.  

De Blasio then filed a lawsuit disputing the panel’s findings, which argued the board’s decision violated the former mayor’s constitutional rights. 

The source refused to provide an update on the legal proceedings, citing the “ongoing legal process.”

The former mayor is currently a visiting fellow at the New York University Graduate School of Public Service, teaching a course on public policy once a week to undergraduate and graduate students.

First elected in 2013, de Blasio served two terms as mayor. Before that, he served as the city’s public advocate and as a city councilman.

He most recently ran a campaign in 2022 to represent New York’s 10th congressional district, but dropped out during the primary contest.