Bangalore property: The real cost beyond base price

Ulsoor Lake periphery — I've been looking at plots/apartments here, the location is solid. I work in real estate, but buying for myself is something else, yaar. Keya Homes ka ek project dekha tha, base price toh theek lag raha, but yeh hidden charges ka kya scene hai? Matlab, possession ke time kya-kya aur add hota hai? PLC, OC, parking... kitna extra expect karna chahiye? And negotiation, does it even work in Bangalore now? Kitna discount milta hai realistically? Is it 2-3% or more? Bohot confusing hai sab.