The 55-year-old man, from Ronkonkoma, fell from the second floor of the Further Lane construction site at 8:43 a.m.
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He lost his balance while working on the second floor and fell 12 feet to the concrete floor below.
He was pronounced dead at Southampton Hospital.
Suffolk Aviation was notified for a medivac, but were not able to fly due to weather conditions.
The oceanfront property was bought in 2014 as a $147 million combined transfer of three separate estates located at 60, 62, and 64 Further Lane, the most expensive sale of its kind in the country.