flood plains of the Yamuna River on one side and the Hindon River on the other. Many villages are visible from the Noida Expressway, beginning from the Mahamaya flyover to Greater Noida on both sides. One end of the Taj expressway terminates on Noida Expressway near the Hindon River and the other at Agra. Up until the 1980s, these villages were flooded every 2–3 years, resulting in people temporarily moving to other places in Noida, and even as far as Mehrauli in South Delhi. Noida is also famous for its tall buildings and comes 2nd in India after Mumbai in this parameter. There is always a huge amount of revenue surplus each year as they are unable to spend the entire amount on development or on maintaining civic amenities. Lease rent and interest from builders are the biggest contributors to Noida's revenue. Besides, the authority gets huge revenues out of water and property transfer charges. "The Noida authority had deposited 3,500 crore as fixed deposits in various banks because of surplus funds. Noida has so much surplus funds with it that it can run the city even if it does not take any taxes from its allottees for 5 years in a row." A tall skyscraper named "Supernova Spira" stands on the Noida side of Delhi Noida Border. It will be the tallest residential tower in northern India after its completion in 2021. The Noida Authority’s plans to establish ‘New Noida’ have opened new opportunities in the Dadri-Noida-Ghaziabad Investment Region (DNGIR). The region will be settled in four phases, according to the Master Plan 2041 submitted recently to the Authority. New Noida will include a land bank consisting of 87 villages of Bulandshahr and Dadri. In 2014, Allahabad High Court orders demolition of twin towers, pulls up Noida Authority for collusion with developer. Construction work stoped at site in 2014 but the twin towers in Noida, built illegally by realty firm Supertech Ltd., were brought down within 12 seconds around 2.30 p.m. on August 28, 2022 with more than 3,700 kg of explosives. Economy In the last 10 years, Noida has also become a hub for software and mobile app development companies like Microsoft, Arm Holdings, HCL, Samsung and Barclays. These companies are contributing to the city's economy with their software product development and service export in foreign currencies. Samsung recently invested in Noida, under the Make in India initiative.