My investment in Electronic City: Total cost confusion

Been tracking properties for years now, but my latest search for an investment in Electronic City Phase II is making me rethink things. I'm eyeing a 2BHK in Keya Homes, around ₹85L, but the all-in cost seems to balloon way past that. From my experience, the sticker price is just the beginning. What's the realistic percentage for all the add-ons? Stamp duty, registration, PLC, parking, and then interiors ka kharcha. I'm calculating almost 15-20% extra on top of the base price. Is this normal for Bengaluru now? Matlab, it's not just the basic property price anymore, right? Koi tips hain on how to factor all this in properly for ROI calculations? Especially for projects like Keya Homes. Hope someone has a better hack for this total cost puzzle.