The series contains New York City Historic District Designation Reports (1969-1973) and one map of historic locations in the Greenpoint and Williamsburg neighborhoods of Brooklyn (2005). The Ortners were key proponents of the landmarking of the Park Slope neighborhood of Brooklyn, and their photographs of Park Slope buildings were used to support the establishment of the historic district. The series also includes negatives and contact sheets of 272-276 Berkeley Place.