The facility will house banks, exhibition halls, food outlets and venues for lectures.
The provisional budget for the project has been set at Sh4 billion.
The office block adopts green architecture.
Donald Trump, who has golf resorts around the world, is among 43 other interested parties.
The project is being developed in two phases at a cost of Sh1.07 billion.
The park will cover over 1.5 million square feet initially, and consist of four zones.
Phase one of the project is expected to be completed in one and a half years.
The Sh500 million Billionaire Resort will be completed by end of next month.
This will be the first sports city to be set up in Kenya since independence.
The facility will create additional 15,000 square metres of commercial floor space.