The plant will have a 40MW installed capacity.
The two have raised the bar on construction of commercial spaces in Kenya.
Thika Road completion has also seen malls being rolled out along the route.
The project has 178 three-bedroom houses and 171 four-bedroom units.
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 factory has a capacity to produce 126,720 expanded polystyrene panels (EPS) panels a year.
The masterplan proposes the creation of more than a dozen commercial centres.
The firm has launched a spirited campaign to market its prefab houses.