ENSR International, a worldwide environmental consulting and engineering firm based in Westford, Massachusetts, leased 15,137 square feet in Loop Central One, at 4888 Loop Central Drive, for its Houston offices. The new office will house ENSR's Houston operations, International-Latin operations and Southern Region management. ENSR is relocating from 3000 Richmond. Loop Central one is a nine story, 178,464 square-foot office building, at the southeast corner of West loop 610 and the Southwest Freeway. Brad Marnitz and Vince Gyorgy of NAI Partners Commercial Realty, Houston, represented ENSR in lease negotiations. Rosmary Kogler and Brian McMackin of Lincoln Property Commercial, Houston represented the landlord.