Hensel Phelps Construction Co. will move its Rocky Mountain Region office and Facilities Services Group from Thornton to Broomfield by next summer — but not in the space it originally eyed five years ago. Instead of setting up shop at McWhinney Real Estate Services Inc.’s new Baseline development, the prolific general contractor will renovate an existing one-story building at 105 Technology Drive in the Interlocken business district. Once it’s o…