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Japanese author Marie Kondo, famed for her “If it doesn’t spark joy, throw it out” manifesto, has nothing on Ilene Rosen. “She’s preaching to the converted,” said Rosen, who lives with her husband Mark Sherry, a pharmacologist, in a 510-square-foot studio overlooking Grand Army Plaza. “For me, the joy is not having stuff around, being able to see a long swath of kitchen counter with nothing on it, or a lot of empty floor space.”

The couple bought their apartment — one large square room with a galley kitchen and a bathroom behind a sliding barn door — a little over a year ago, downsizing from a two-bedroom, two-bath duplex in the neighborhood. “The children are clearly not coming back,” said Rosen, a partner in R&D Foods, the gourmet grocery and takeout shop on Vanderbilt Avenue in Prospect Heights. “It seemed like the right time to downsize.” (Her 21-year-old twin daughters have their own apartments, and their dad’s Manhattan pad to sleep in if they choose.)