Long one of Brooklyn's most established (and desirable) neighborhoods, Park Slope keeps on getting hotter.

Bordering the Olmsted and Vaux-designed Prospect Park, Park Slope is best known for its impressive stock of brownstones. Traditionally, Eighth Avenue (along the border of the park) was the area's swankiest address, with nearby Seventh Avenue serving as the main commercial corridor.

But as the Slope's popularity grew, so, too, did the neighborhood's size. In recent years, formerly down-at-the-heels Fifth Avenue has emerged as a hipsters' Park Slope -- as opposed to the families pushing double strollers up on Seventh Avenue -- with an impressive array of bars and restaurants.

Even more recently, Park Slope chic has spread to the grimy, bustling Fourth Avenue, where new condos and businesses are rapidly transforming the nabe and offering would-be residents options other than brownstone apartments. New arrivals include Novo (343 Fourth Ave.), where one-bedrooms started at about $310,000, and the 68-unit development The Crest (302 Second St.), with one-bedrooms starting in the mid-$300,000s.