The Commercial to Residential mix is 60:40.
leaving the question of rates aside for the time being, the price per sqft of shops/showrooms is always higher than offices and the price of offices is always higher than residential apartments. So it stands to reason that whatever is the price of residential apartments (you can take whichever number you feel comfortable with), the prices of offices and shops is always going to be higher - hence the overall price realization for the project as a whole is going to be substantially more than the going price per sqft for residential apartments ( which if the 99 acres report is to be believed in Perambur is Rs 5792 psf )
Secondly, this is the first large scale development in North Chennai. There was a severe paucity of land here and there was simply no space anywhere left to build. Perhaps that is the reason why majority of the construction is happening elsewhere in Chennai
The primary purpose of the development is to decongest the dense, populated marketplace and uplift the standard of living in North Chennai.
Thirdly, and this is important - North Chennai is primarily a marketplace - and the demand for project is going to come from those wishing to shift from their small & tiny shops & showrooms to a bigger commercial place with better amenities. With that, they would probably want to shift their residences as well.
I will post details about my interaction with Codename City and try and understand how much has been sold.