What are the age requirements for marker topics?
Historic persons must be deceased for at least 10 years in order to qualify, unless they are of statewide or national significance. Historic events that changed the course of state or local history must have occurred at least 30 years ago. Most other topics, including institutions, organizations and businesses, must date back at least 50 years in order to qualify. For the Recorded Texas Historic Landmark designation, buildings and structures need to be at least 50 years of age. The topic must also have demonstrated historical significance and, in the case of buildings and structures, possess architectural significance as well.
