The Bombay Stock Exchange benchmark Sensex on Thursday slid 271 points on heavy selling by funds in blue-chips led by realty and metals amid weak global trend and rising inflation on the domestic front.The Sensex closed lower by 271.10 points at 16,224.95. It recorded the day's lowest level of 16,188.80 during intra-day trade. Realty, metal and capital goods shares were battered.The National Stock Exchange index Nifty also declined 86.50 points to 4,845.35. Marketmen said a weak Asian trend and lower opening in Europe partly influenced trading sentiments. Rising food inflation also weighed heavily on the sentiment.Fear of NTPC's FPO not living up to expectation also dented sentiments, brokers said. Of the 30-BSE index-linked stocks, 27 fell while 3 ended with moderate gains.