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Mark O'Brien shares his historical 1-1-3 NYC brownstone flipping math

Mark O'Brien · I spent a day with a blue-collar millionaire in NYC · Jul 21, 2026 · at 8:06

Real estate developer Mark O'Brien explains the baseline economics and profit margins of his early New York City townhouse flips to host Sam Parr.

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“The numbers back then were basically you buy for a million, build for a million, and sell for three million. So you make a million bucks. So this house was 800,000. I built it for about 800,000, and I made a lot of mistakes.”

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