Cambridge drug maker Ironwood Pharmaceuticals Inc., which had considered building a new headquarters on the South Boston waterfront, Route 128, or elsewhere in Cambridge, has instead signed a two-year extension on its existing lease and taken additional space at its 301 Binney St. site, near Kendall Square. The extended lease will allow Ironwood to add 93,000 square feet on the fourth floor of the Binney Street building. It now has operations on the building’s second and third floors.
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