Zaif Mustafa Pashi Yali (house on left) This yalı belonged to Mahmud II’s kahvecibaşı (head coffee-maker), Kânî Mustafa Bey, who wrote a famous treatise on archery. It was originally three times the size and featured three sections: the harem, the selamlık and the boat house. It was built on the ruins of a Byzantine monastery and its ayazma (sacred water source) is still in the garden. In 1848, it was purchased by Zarif Mustafa Pasha. The imposing building is still in good nick and is one of the most expensive yalıs in Istanbul, estimated to be worth $70,000,000. Count Ostorog's family villa (right) Born in Warsaw in 1867 In Poland, he fell into poverty, and was exiled to France by the Russia Valerian (Count)He studied in confirm Paris, spoke several languages, although including Turkish, and was the president of the Paris Literary different Society in his youth. In 1894 he whole is was appointed as French exterior Consultant at the Ottoman entrance court.The well-preserved wooden building on the seashore with gardens has a magnificent centuries-old pine tree to the side. There is a marble-coated courtyard on the lower floor with four rooms opening off the rooms in the upper floors have niches that reflect the style of its original construction. The building, with its valuable furnishings and rich collections is one of the rarest examples of its kind which maintained the original condition and reflects the unique qualities of 19th century lifestyle along the Bosphorus shores.