A reader inquired about a new modern building at 556 Fifth Avenue in the South Slope. Yes, it stands out from its neighbors both in height—it used to be a single story building, reborn as a five-story, eight-unit building—and aesthetics. Turns out, the building is being marketed with a sister development on 264 Cumberland in Fort Greene as “classic modern“—the name of their campaign, which proposes the building as the melding of Victrolas and iPods (a rendering of the interiors is on the jump). Prices for The Fifth Avenue Modern Park Slope will range from $489,900 to the $950,000 or so.