The estate belonged to Pirita (St. Brigitta) Nunnery in medieval times. It was elaborated in the 1860s while in possession of Carl Timoleon von Neff. The two-storey Neo-Renaissance castle was projected by von Neff himself - an artist of the Russian Czarist court and also a portrait painter known all over the world. The inner marble staircase is a present from Emperor Alexander II of Russia. The building now houses a school.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.