A prospective flat buyer in Bangalore is concerned about a builder constructing 28 flats when only 27 were approved, with an extra flat on the ground floor. Experts advise that this is an illegal deviation from the sanctioned plan. While some courts may allow regularization with fines, it's strongly recommended to avoid purchasing until the deviation is resolved and an occupancy certificate is obtained. Consulting a local lawyer for a legal opinion is crucial before making such a significant investment.