Office rental prices might not see any major fall across the country's major business hubs-National Capital Region (NCR), Mumbai and Bangalore - even as the commercial realty markets in these areas are expected to witness a significant surge in supply, a leading real estate consultancy firm CBRE in a report. Bangalore is expected to witness further rise in the office rentals but those in Delhi, Gurgaon and Noida as well as Mumbai are expected to remain mostly flat in the short to medium term.