From October 1942 to May 1948, he taught courses on the history and theory of architecture as a substitute professor of the University of Bucharest's architecture faculty. He wrote a column for "Viața Românească" between 1944 and 1946; there, Cantacuzino discussed the work of various painters, exhibitions and official salons. His "Despre o estetică a reconstrucției", a passionate plea for humanism and patriotism, was published in 1947. The same year, he wrote a still-unpublished study on the historiography of Vitruvius. A dictionary of terms and concepts in Romanian and world art also remains in manuscript form. His residence in Bucharest was destroyed during the World War II bombardment of 1944. In the period immediately after the war, he continued his architectural activity, designing a number of villas as well as other projects, the most imposing of which is the Institute for Studies and Power Engineering building in Bucharest.