Thinking the unthinkable is a way of life at IBM Corp these days, and the latest unthinkable thought is that the firm should perhaps vacate its Armonk headquarters, the New York Times reports. IBM emphasised that the 400,000-square-foot Armonk building had not been listed any estate agents and was not yet up for sale, and said the decision would depend on factors such as locating a much smaller alternative, projecting the cost savings, and finding a buyer. The company currently employs 700 people at Armonk out of a total headquarters staff – scattered across major IBM locations – of 3,900. That is down from 5,100 last year, and the cuts will continue this year. The building, designed by Skidmore, Owings & Merrill, was opened in 1963; a glass atrium by I M Pei was added later.