Fast-growing mortgage lending company Service First Mortgage has moved its corporate headquarters to McKinney, where it will employ 128 people within three years, with the potential to expand more. The company took a full floor of office space - about 25,000-square-feet - at McKinney Corporate Center I at 6800 Weiskopf Ave. in McKinney. The space had been vacated by Barclays, and the Service First lease brings the building's occupancy up to 82 percent, Darrell Auterson, president/CEO of the...