Professional Arborist R. Bruce Allison, PHD. has employed visual examination and various high technology tools to determine, as accurately as reasonable, the current structural condition of the tree trunks of the trees on the Terrace. The large oak tree to the east of the Union Theater has been a major concern. Using these high technology tools, Dr. Allison has found that this large oak tree has a significant amount of internal decay and root rot. The blue areas on the study indicate the areas that have experienced significant decay.