114 applications were received for the 104 apartments that were being sold off-the-plan.
The office block adopts green architecture.
Donald Trump, who has golf resorts around the world, is among 43 other interested parties.
The homes, costing Sh1m for a two-bedroom unit, will be built on 1,000 acres in Athi River.
Construction of the Tazara Flyover commenced in 2016 and was completed in 29 months.
Development comprises 81 residential houses, of which 20 were completed in phase one.
The plant will have a 40MW installed capacity.
The High Court has stopped the State from acquiring land from the Nairobi National Park.
Phase one of the project is expected to be completed in one and a half years.
The project began in 2009 following the award of the tender to China Road and Bridge.
Move signals a strategic push into high-growth, technology-driven markets.
Explore some of the biggest construction expos of 2026 worldwide.
WSP highlighted that the deal would open “potential cross-selling opportunities”.