Why living in Bengaluru is expensive as compared to Chennai, Delhi, Kolkata, Mumbai

According to a report by The Hindu… The farther a person stays from the central business district (CBD), greater the chances of lower cost for housing, but the Namma Metro in Bengaluru cannot take a commuter beyond 25 km from the core areas complete report is on link below. Source: https://www.thehindu.com/news/cities/bangalore/why-living-in-bengaluru-is-expensive-despite-namma-metro-as-compared-to-chennai-delhi-kolkata-mumbai/article71475382.ece