Nesting was on their minds when Ms. Singh and her husband, who works in finance, moved into their first apartment in the area, a two-bedroom co-op in a walk-up on First Street. Two years and one daughter later, they traded up to a $1.85 million three-bedroom duplex in a limestone co-op across the street, which they bought from friends who were also moving within the neighborhood. Finally, in 2011, after the birth of two sons, they bought a $2 million limestone house on Union Street near Grand Army Plaza.

By then, Ms. Singh said, the family’s lives had become happily entwined with Park Slope.

“It’s got a real small-town feel,” she said. “On my walk to school with the kids, I know so many people from all different parts of my life: people I know as a teacher, small vendors, real estate people and the parents of my children’s friends.” But if, as some residents say, Park Slope has a “Sesame Street” atmosphere, the area’s rents have risen high enough to push out many mom-and-pop shop owners of Mr. Hooper’s ilk. Seventh Avenue abounds with banks and with real estate offices that have windows full of pricey listings reflecting the neighborhood back on itself. On Union Street, the Tea Lounge, a popular bourgeois-bohemian hangout, recently shuttered.

Image 763 CARROLL STREET A two-family A two-family townhouse with nine bedrooms and three and a half baths, listed at $3,950,000. (718) 832-4193 Credit... Alan Chin for The New York Times

Nevertheless, even as parts of Park Slope are increasingly buffed to a high polish, the area still offers a variety of experience. After living much of the last six decades in the North Slope townhouse her seamstress mother had bought in 1949, Lorraine Leong, a health care administrator, decamped to the southwestern fringe of the neighborhood in 2012, paying $693,000 for a two-bedroom condominium on 12th Street and Fourth Avenue, a thoroughfare where blocky residential buildings have sprung up since a 2003 rezoning. Her son, a “foodie” who lives upstairs, keeps her informed, she said, about “all the great restaurants opening up” on Fifth Avenue and Flatbush Avenue.

“Fourth and Fifth Avenues have that diverse mix that Brooklyn always had, and it’s very appealing to me,” said Ms. Leong, who is of Chinese descent. “There are Italians and Latinos still around, and a guy on my corner sells tacos from a little stand for a dollar. You don’t want to lose that.”