ATO Architects won the design competition for the headquarters of the Federal Inland Revenue Services (FIRS) in June 2011. The total site area is about 81,000sqm, which accommodates a building footprint of about 63,000sqm. The proposal comprises of three office towers on a podium with an area of about 63,000sqm and a multi-storey car park block which also houses social facilities such as gymnasium, clinic, religious facilities.
The office spaces are accommodated on 17 floors in the three towers, which are linked at the base by some communal facilities. The offices have been categorized and designed in departments as required by the client. They come in two major types; the open plan offices with partitions to create the required exclusivity of the work groups and cellular offices for group heads and directors.
Each tower has been provided with 2 staircases, and four elevators to facilitate easy ingress and egress to and from the building. The towers are separated by the ample airspace to allow adequate natural lighting and ventilation when required. A helipad has been provided at the roof level and this comes in the form of a circular platform linking all three towers and distributing directly to the lift lobby provided within the towers. A total number of 416 car parking spaces has been provided.