Ottoman archives

The Ottoman Archives are a collection of historical sources related to the Ottoman Empire and a total of 39 nations whose territories one time or the other were part of this Empire, including 19 nations in the Middle East, 11 in the EU and Balkans, three in the Caucasus, two in Central Asia, Cyprus, as well as Palestine and the Republic of Turkey.
The main collection, in the "Başbakanlık Osmanlı Arşivleri" (The Prime Minister's Ottoman Archives) in Istanbul, holds the central State Archives ("Devlet arşivleri").
After more than a century in the center of the old city, the Ottoman state archives were relocated in 2013 to the Kağıthane district of Istanbul.
History.
The present collection contains a few documents from the earliest period up to the reign of Sultan Süleyman in the sixteenth century. The organization of these records as a modern archive began in 1847 with the establishment of "Hazine-i Evrak". The original building was located on the grounds of the grand vezir’s offices in Gülhane and contained several main groups of documents: the records of the Imperial Council (Divan-i Hümayun) and the records of the grand vezir’s office (Bab-i Ali), as well as the records of the financial departments (Maliye) and cadastral surveys (tapu tahrir defteri). Mustafa Reşid Paşa ordered the building a new record office in 1846. It was completed by architect Gaspare T. Fossati in 1848. The office of "Surveillance of Treasury of Documents" was formed and Muhsin Efendi was appointed as its manager.
With the establishment of the Republic, the Hazine-i Evrak was transformed into "Başvekalet Arşiv Umum Müdürlüğü" (The General Directorate of the Prime Ministry) and eventually the Başbakanlık Arşiv Genel Müdürlüğü. During this period, the records of various nineteenth-century Ottoman offices and administrative authorities were added to the collections.
Concurrent with these changes and additions, Turkish scholars took the first steps to classify and catalog the various collections beginning in the 1910s. These early efforts produced a number of classified collections (tasnif) which are still cited according to the name of the scholar who created the catalog. Today the work of cataloging the vast collection continues.
After more than a century in the center of the old city, the Ottoman archives were relocated in 2013 to the Kağıthane district of Istanbul.
The archives and the Armenian Genocide.
The Ottoman Archives not only contain information about the Ottoman dynasty and the Ottoman state, but also about each nation that holds part of these resources. Though touted as being open to all researchers, scholars have complained about being prevented access to view documents due to the nature of their research topic. However, plenty of Armenian Genocide researchers including the British-Armenian Ara Sarafian, as well as Taner Akcam (known for his research on and acceptance of the Armenian Genocide) have used the Ottoman archives in Istanbul extensively when citing research for their books though they have made claims that obstacles were put during their access.
The European Parliament stressed in a resolution voted on 15 April 2015, that Turkey should use the commemoration of the centenary of the Armenian genocide as an important opportunity to recognize the Armenian Genocide and open its archives.
The WikiLeaks cable 04ISTANBUL1074 classified and signed by David Arnett on July 4, 2004 at the Consulate General of the US in Istanbul states, that Turkey has eliminated incriminating documents concerning the Armenian Genocide from the Archives:
"According to Sabanci University Professor Halil Berktay, there were two serious efforts to purge the archives of any incriminating documents on the Armenian question. The first took place in 1918, presumably before the Allied forces occupied Istanbul. Berktay and others point to testimony in the 1919 Turkish Military Tribunals indicating that important documents had been "stolen" from the archives. Berktay believes a second purge was executed 
in conjunction with Ozal's efforts to open the archives by a group of retired diplomats and generals led by former Ambassador Muharrem Nuri Birgi."