Louis and Joel Kestenbaum

Over the last two decades, the father-son team behind Fortis Property Group has grown the company into one of Brooklyn’s most ambitious development shops.

After its founding in 2005, Fortis built a massive portfolio of Class A office buildings in Dallas, Boston and Norfolk, Connecticut. It embarked on its first condo developments in the 2010s along the Brooklyn waterfront. The firm also made moves in Manhattan, making headlines with their troubled leaning tower of Seaport condo project that stalled beneath construction delays and litigation.

The firm’s crown jewel is Olympia Dumbo, the sail-shaped tower that’s pushed Brooklyn condo pricing into uncharted waters.

The 33-story, 76-unit project broke ground in 2019. With a projected $404 million sellout, Olympia isn’t the biggest development in the neighborhood’s recent wave, but its units are among the borough’s priciest. Since launching sales, it has regularly landed some of the borough’s top contracts and even snagged a cameo in the 2025 thriller “Highest 2 Lowest” by Brooklyn royalty Spike Lee. In 2025, a $10 million resale in the building set a borough record at roughly $3,300 per square foot.