I was very keen to know details of Xrbia's site in hinjewadi, googled for nearly two hours and found a presentation (ppt) which reveals there first project in hinjewadi is nothing but Eiffel's silicon city(page 16 and 17 of presentation).
As per agreement following MOFA, Flats are being sold on the basis of carpet area only. It's a separate story that builder charges on the basis of built-up area and makes an agreement on the basis of carpet area. As a result if the rate is 3000psft say as per built-up area then the rate comes up around more than 4000psft as per carpet area.
In this project's case, builder might have already done the calculations and provided you carpet area rate psft. You need to check this. By the way what's the rate psft??
Looking at the title seems this is the first project of Hafeez Contractor in Hinjewadi but actually it's not. There are couple of more. One of those is Kul Ecoloch. As a partner, yeah, this new project may be his first.