Treasury has been releasing funds meant for the project periodically.
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 State has shortlisted three firms from a pool of five contractors that bid for the work.
It will replace the 14-inch pipeline that has existed for 36 years.
A total of 12 locomotive engines have been delivered to Mombasa for the project.
The 940km road will link Eldoret to Juba through the Nakodok/Nadapal border.
High rents have scared away tenants who opt for older flats that are cheaper.
The project is said to be running behind schedule due to the absence of political will.
Free pay TV and Wifi are now being offered by landlords in attempts to attract new tenants.
Talks are underway for China to fund a new highway and rail extension.
The Chinese-funded Orpower 22 power plant will take 17 months to complete.
Bedsitters will rent for Sh3,200 per month on a 30-year rent-to-own plan.