Question: Which location, Nusretiye Mosque and Dolmabahçe Palace served as the main administrative center of the Ottoman Empire from 1856 to 1887 and 1909 to 1922?
Sentence (from "Dolmabahçe Palace"): Dolmabahçe Palace (Turkish: "Dolmabahçe Sarayı" , ] ) located in the Beşiktaş district of Istanbul, Turkey, on the European coast of the Bosphorus, served as the main administrative center of the Ottoman Empire from 1856 to 1887 and 1909 to 1922 (Yıldız Palace was used in the interim).
Relevant evidence: Yes