Abuja countries relocated their embassies to Abuja, and many maintain their former embassies as consulates in Lagos, the commercial capital of Nigeria. Abuja is the headquarters of the Economic Community of West African States (ECOWAS) and the regional headquarters of OPEC. Abuja and the FCT have experienced huge population growth; it has been reported that some areas around Abuja have been growing at 20% to 30% per year. Squatter settlements and towns have spread rapidly in and outside the city limits. Tens of thousands of people have been evicted since former FCT minister Nasir Ahmad el-Rufai started a demolition campaign in
Abuja the late 1980s. The master plan for Abuja and the Federal Capital Territory (FCT) was developed by International Planning Associates (IPA), a consortium of three American firms: Planning Research Corporation; Wallace, McHarg, Roberts and Todd; and Archisystems, a division of the Hughes Organization. The master plan for Abuja defined the general structure and major design elements of the city that are visible in its current form. More detailed design of the central areas of the capital, particularly its monumental core, was accomplished by Japanese architect Kenzo Tange, with his team of city planners at Kenzo Tange and Urtec company. Most