BOSTON--(BUSINESS WIRE)--American Tower Corporation (NYSE: AMT) today announced that it has closed its previously announced acquisition of approximately 4,700 communications sites in Nigeria from Bharti Airtel Limited, through Bharti Airtel Limited’s subsidiary company, Bharti Airtel International (Netherlands) BV. About American Tower American Tower, one of the largest global REITs, is a leading independent owner, operator and developer of communications real estate with a portfolio of approxi