It’s the Bronx, New York City’s northernmost borough. Roughly 30 minutes from Midtown Manhattan by train, the Riverdale area ...

In Fieldston, a new listing at 5020 Grosvenor Ave. stands to break a borough record if it sells for its asking price, according to StreetEasy data.

Mature trees drape over multimillion-dollar mansions, and boats hum along the river. No, this isn’t the Hudson Valley or upstate New York. It’s the Bronx, New York City’s northernmost borough.

A Bronx mansion designed by one of New York’s most revered architects hit the market Tuesday for $8.75 million—making it the borough’s priciest residential listing, Mansion Global has learned.

Sandra Galuten went from living in a $6 million, 15,000-square-foot mansion with marble floors and a cocktail lounge to a room in a Bronx hotel. For decades, Galuten, 80, and her entrepreneur husba… ...