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ST. PAUL, MINN. — Ecolab Inc., a provider of water, hygiene and energy technologies and services, has signed a purchase agreement to acquire the 17-story North Tower from Travelers in downtown St. Paul. The transaction is expected to close in the third quarter. By the end of 2018, Ecolab will relocate its associates from the three buildings that comprise its world headquarters in downtown St. Paul to the North Tower. Ecolab will begin the process of relocating associates to the North Tower in the latter part of this year. Built in 1999, the North Tower includes 882,000 square feet of space, of which 484,500 square feet comprises office space, a data center and building common areas.