The Last Affordable Brooklyn Neighborhood with Park Views

“I always thought that in terms of the built environment, it’s akin to the Upper West Side,” says Seth Brown of Aspen Equities, which is developing a 50-unit, two-building rental at 520 Parkside Ave. in a joint venture with Rezo Holdings. “It’s next to the park [and has a] mix of brownstones on side streets . . . It’s lovely.”