The mall offers a mix of local and global retail outlets including Carrefour.
Decision was made after Kenya failed to raise 15% of the project cost.
The upgrade will enable the airport to handle large aircraft such as Boeing 767 and Boeing 467.
Greenpark Estate 5 will have a total of 148 units, 24 of which have already been booked.
Riverine Estate, which sits on 30 acres of land, comprises 211 maisonettes and apartments.
The 940km road will link Eldoret to Juba through the Nakodok/Nadapal border.
The facility is the largest single commercial development in Juja area.
The plant will have a 10MW installed capacity.
The twin-tower will provide 50,000 sq. m. of space out of which 30,000 will be sold.
This is the second largest mall in Kenya after Two Rivers Mall on Limuru Road, Nairobi.