The National Retail Tenants Association (NRTA) and Boston University (BU) have announced the expansion of the college's real estate certificate program to include lease administration classes. The first of these courses, which launched on April 12, is entitled "Methods and Techniques of Commercial Lease Abstracting" and is being taught by Rick Burke, president of Marblehead, Mass.-based Lease Administration Solutions and a founding member of the NRTA.