It’s Millionaire vs. Billionaire in the Battle of the SoHo Pergola

The Dalios’ lawyer said the apartment is owned and inhabited by Mr. Dalio’s children. He said Mr. Pignatelli was “improperly including Mr. Dalio as a defendant in an obvious effort to try to embarrass him into a settlement.”

For several years, 6G was inhabited by Mr. Dalio’s son Paul Dalio, a filmmaker, and Paul’s wife, Kristina Nikolova Dalio, a cinematographer.

The neighbors had a mostly friendly rapport. Mr. Pignatelli said that Ms. Dalio asked to see his apartment in 2019: “She said, ‘I want to see your place to get inspired, because I know it’s very beautiful.’”

As her family grew, Mr. Pignatelli said she told him, they needed more space. Would Mr. Pignatelli be willing to sell his apartment to her and her husband?

“I said, ‘No, I’m not interested,’” he recounted. “Then she said, ‘Oh, we’re going to have to move.’ So I said, ‘You know, if you move and you want to sell your place, please let me know.’”

Things devolved. In February 2020, Mr. Pignatelli texted Matthew Dicker, the co-op board chairman, to complain about items the Dalios had left in the building hallway: shoes, umbrellas, toys and packages.

“They keep their door open for hours during the day,” Mr. Pignatelli wrote, “with kids playing and screaming in this space (why not inside their home?) and I have to hear them scream or play piano, like they are my kids.” (Mr. Dicker replied in a text: “Yikes.” Reached by The Times, he declined to comment.)