Riverine Estate, which sits on 30 acres of land, comprises 211 maisonettes and apartments.
The twin-tower will provide 50,000 sq. m. of space out of which 30,000 will be sold.
Churches are aggressively pouring billions of shillings into Kenya's property sector.
Mr Pattni has been investing heavily in the city's land and property sector since January.
The property is expected to appeal to high net worth international buyers.
114 applications were received for the 104 apartments that were being sold off-the-plan.
The billionaire has developed plots within Nairobi's Westlands and Upper Hill areas.
The Athi View Estate targets middle to high income earners in Nairobi.
The show-house for phase one of the project will be ready by February next year.