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Notes from 5.4 million NYC condo transactions. No sampling, no vibes, just SQL and mild obsession.

September 2026

Buy Low, Sell 13 Months Later: The Fastest Condo Flips in NYC

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Five boroughs, 25 flips, and one penthouse that tripled its money thirty times over.

Fastest condo flips in NYC: +354% in 5 months, Brooklyn