Tehran (IP) - Kaj Square, is the oldest and main Saadat Abad Square in northwestern Tehran. This area is located on the southern foothills of Alborz Range and in District 3 of Tehran Municipality. Saadat Abad has expanded since the Islamic Revolution and the imposed war, and its population has grown rapidly. As there is currently no vacant land in Saadat Abad, vertical development of the neighborhood has intensified, increasing the number of floors of buildings.