Ramat Gan is a city in the Tel Aviv District of Israel which borders the cities of Tel Aviv, Giv'atayim, and Bnei Brak. It houses Israel's national soccer stadium, Bar-Ilan University, an advanced medical center (Sheba Medical Center), and a national park. It is also the home of one of the world's major diamond exchanges, in which Israel's tallest office tower is located. Ramat Gan was established in 1921 as a moshav, a communal settlement, with a focus on agriculture. After commercial and population expansion, it was declared a city in 1950. As of 2004, Ramat Gan had 127,400 residents, on an area of 12,000 dunams (12 km²).