[custom_adv] The House of Leadership is the official residence, bureaucratic office and principal workplace of the Supreme Leader since 1989. [custom_adv] Its structure is a mixture of traditional Beit and modern bureaucracy. The institution is located in central capital and is run by Mohammad Mohammadi Golpayegani. [custom_adv] A presidential palace is the official residence of the president in some countries. However, some countries do not call the official residence of their head of state a "palace" or use the building only as a workplace separate from the president's actual home. [custom_adv] Some presidential palaces were once the official residences to monarchs in former monarchies that were preserved during those states' transition into republics. The Cumhurbaşkanlığı Sarayı in the Turkey is the world's largest Presidential Palace, four times that of Versailles. [custom_adv] The talks that led to the historic deal over nuclear program have proceeded on and off for a dozen years, but only truly came to life after two key decisions in 2013, both made behind closed doors -- one at the White House, the other, a few months later, at imposing presidential palace, Beit Rahbari, in central capital. [custom_adv] The House of Leadership is the official residence, bureaucratic office and principal workplace of the Supreme Leader since 1989. [custom_adv] Its structure is a mixture of traditional Beit and modern bureaucracy. The institution is located in central capital and is run by Mohammad Mohammadi Golpayegani. [custom_adv] Some presidential palaces were once the official residences to monarchs in former monarchies that were preserved during those states' transition into republics. The Cumhurbaşkanlığı Sarayı in the Turkey is the world's largest Presidential Palace, four times that of Versailles.