MUDURNU, Turkey — Looking for a castle on a cul-de-sac in the Black Sea region of Turkey?

You might even be able to get a deal on it.

The Yerdelen brothers, construction entrepreneurs from Istanbul riding a real estate boom, had plans to build more than 700 minicastles, with turrets and breezy rooftop terraces overlooking the forest, aiming to draw in Arabs from the Gulf countries who love to come to Turkey for its lush nature and Mediterranean climate.

At first, business was brisk: Half the castles were sold, they said, and building was going apace. Then oil prices slumped, hitting the buyers. Meanwhile, between terrorist attacks, a failed coup attempt and what many experts say was unsustainable borrowing, cronyism and huge public works projects with little economic return, Turkey’s economy ground to a halt.

Now, the development is almost at a standstill as the partners work their way through bankruptcy court but are still allowed to trade, their futures debated regularly in the news media.