Having no children, Classen endowed his estate to a foundation, Det Classenske Fideicommis.

[1] Classensgade originates in the access road to a property, Justineborg, which was named after Classen's sister-in_law.

[2] One of the only surviving country houses in Østerbro, Øbrogård or Vennero, is located in the courtyard of No.

The facade surrounds a small cul-de-sac, a solution chosen to make the most of the site without employment of the traditional courtyard buildings.

52-68) is a large Neoclassical apartment complex from 1922 to 1924 designed by Povl Baumann, Peter Nielsen and Ole Falkentorp based on a project by Hans Koch og Carl Petersen.

The plaque features a portrait of Borge as well as a quote by him, stating that the smile is the shortest distance between two people.

[5] The nearest station is Østerport, served both by metro, S-trains, regional and intercity trains.