 While each district has its own clearly demarcated commercial and residential sectors, the Central District is the city's principal Business Zone, where practically all parastatals and multinational corporations have their offices.An attractive area in the Central District is the region known as the Three Arms Zone, so called because it houses the administrative offices of the executive, legislative and judicial arms of the federal government.A few of the other sites worth seeing in the area are the federal secretariats alongside Shehu Shagari Way, Aso Hill, the Abuja Plant Nursery, Eagle Square (which has important historic significance, as it was in this grounds that the present democratic dispensation had its origin on 29 May 1999) and in which all subsequent Presidential Inauguration ceremonies have taken place.