Hyderabad investment: Hidden costs ka darr, anyone?

Are possession main builder log itne hidden charges lagate hain? I'm based in Dubai, eyeing an investment 2BHK, maybe ₹90L, around Alwal. Salarpuria Sattva ka ek project dekha tha online. Brochure price ek hai, but then I hear about PLC, floor rise, club membership, maintenance advance, transformer charges... Matlab, yeh sab milake kitna extra ho jaata hai? I can't do a site inspection myself, relying on POA. Already stressed about finding a reliable property manager. Anyone bought from Salarpuria Sattva recently? What unexpected costs did you face at possession? Is it like 10-15% extra on the base price? Bahut tension hai yaar, can't afford surprises later.