The name was Galatasaray island, the name of a soccer team, and they changed the name to Suada, also known as Kurucesme islet by residences that one of the best places to swim (in the pool) and have dinner. It is reachable by boats that only 160 meters from the coast.
The Ottoman Sultan Abdulmejid ordered to built Dolmabahce palace to architect Sarkis Balyan. Upon that job, the sultan gave this island to the architect, and he built a pavilion for himself. Once Russian painter Ivan Aivazovsky stayed in the mansion.
So long time used as coal depot and hired by ship transportation company. In 1957 Galatasaray Sports Club bought this and renovated it in that style you can see on Bosphorus. You can better see Suada Island from the Bosphorus.
You can book Istanbul Bosphorus Cruise Tour with Romos Travel.