Now they are selling at 3.9M to 4.9M/= from the initial 8.5M/= for 2 bedrooms units.

This property market is exploding Walahi.

That's the cash offer for the first 200 units . It's not for all units.
They used the same marketing strategy for their completed apartments on Mombasa road. They offered some for 3M cash, then sold the rest at 6M

On November 7, 2006, Kenyan President Mwai Kibaki and China Development Bank governor Mr. Chen Yuan met and agreed to sign a framework between the bank and the government of Kenya to expedite the funding of a project for low and medium income housing. The project came in response to Kenya's substantial housing deficit. On December 6, 2006, China Development Bank announced that it would provide a 17 million dollar commercial loan for the housing project, to be repaid in 15 years. The Development Bank of Kenya plans to provide long-term finance of up to 15 years to low and middle income housing project customers. On May 30, 2008 the ground-breaking ceremony of the housing project occurred. The entire project is expected to last about fifteen years (until 2021) or later, but may last longer due to slow progress accredited to court injuctions and land scarcity. As of 2012, only 2,000 housing units have been completed comared to the 40,000 planned for completion.Implementation of the project's first phase involves the production of 720 housing units for sale and appears to have been successfully completed. As of January 2011, the implementing agencies have concentrated their efforts on Phases 2 and 3. The implementation of the project has so far been carried out by implementing agencies China Wu Yi Corporation Limited and Ederman Properties.
https://china.aiddata.org/projects/810