In 1988, Israel ordered the closure of Orient House, home of the Arab Studies Society, but also the headquarters of the Palestine Liberation Organization, for security reasons. The building reopened in 1992 as a Palestinian guesthouse. The Oslo Accords stated that the final status of Jerusalem would be determined by negotiations with the Palestinian Authority. The accords banned any official Palestinian presence in the city until a final peace agreement, but provided for the opening of a Palestinian trade office in East Jerusalem. The Palestinian Authority regards East Jerusalem as the capital of a future Palestinian state. President Mahmoud Abbas has said that any agreement that did not include East Jerusalem as the capital of Palestine would be unacceptable. Israeli Prime Minister Benjamin Netanyahu has similarly stated that Jerusalem would remain the undivided capital of Israel. Due to its proximity to the city, especially the Temple Mount, Abu Dis, a Palestinian suburb of Jerusalem, has been proposed as the future capital of a Palestinian state by Israel. Israel has not incorporated Abu Dis within its security wall around Jerusalem. The Palestinian Authority has built a possible future parliament building for the Palestinian Legislative Council in the town, and its Jerusalem Affairs Offices are all located in Abu Dis.