Vahdettin Pavilion

Vahdettin Pavilion, a.k.a. Çengelköy Pavilion (Turkish: Vahdettin Köşkü or Çengelköy Köşkü) is the name of a rebuilt structure in Çengelköy neighborhood of Üsküdar district in Istanbul, Turkey. It is also the name of a historical timber mansion which stood at the same location. The original pavilion was used by the then Ottoman şehzade (prince) Mehmed Vahdettin. The site of this monument, which was demolished in 2013 and replaced with an inaccurate concrete replica, is now an official residence assigned to the President of Turkey. It is also used as state guest house.

The residence was designed by the French-Ottoman architect Alexander Vallaury (1850–1921) and built by Ottoman Sultan Abdul Hamid II (reigned 1876–1909). The sultan allocated the building to his brother, Mehmed Vahdettin (1861–1926), who resided in the pavilion before he ascended the throne in 1918. As he was removed from throne in 1922, and was forced to leave the country, he gave the property to one of his odalisques. The real estate was parceled and sold to third persons.

It is situated on a hill in Çengelköy, on the Asian part of Istanbul, overlooking the Bosphorus. The real estate covers an area of 65 decares (65,000 m2; 700,000 sq ft). There are additional buildings in the property including Old Köçeoğlu Pavilion, Kadın Efendi Pavilion and Ağalar Apartment.