CityPlat, a real estate firm founded in Cary last year, has acquired a 5-story office building at 107 Fayetteville Street in downtown Raleigh for $3.2 million to serve as its new headquarters. The 13,125-square-foot building will accommodate the company’s expanding team of 12 employees, with CityPlat occupying the third and fourth floors while leasing the remaining space to other tenants.