Hamas, Inc.: The Property Empire That Funded Militant Attack on Israel

It seems a long way from the misery of Gaza's shattered buildings. Situated a short walk from the Golden Horn, an estuary of the Bosphorus in bustling Istanbul, AG Plaza boasts terraces, pools and commercial space, and is designed to attract tech companies that want to benefit from the city's Commerce University campus.

Yet the two places are indeed linked. The glistening project in Turkey's cultural capital was built by a company controlled by what the U.S. Treasury Department describes as "Hamas elements."

The AG Plaza in Istanbul is just...