Together with Gheorghe Balș and Nicolae Ghica-Budești, he formed part of the historic monuments committee, helping create a scientific template for restorations.[6] He was granted the State Prize in 1952 for rebuilding and expanding the Bucharest City Hall [ro],[7] and in 1958 was awarded the Order of the Star of the Romanian People's Republic, first class.[5] Together with his predecessor Ion Mincu, Antonescu helped define the existence of a national style in Romanian architecture, becoming a dominant force in the field during the first half of the 20th century.[10] While training under Guadet and Edmond Paulin, he began his career in the classically oriented academicism prevailing at their school, designing several important works in this spirit.In Biserici nouă – proiecte și schițe (1942, re-edited 1943), he presented theories on the history of church architecture and the foundations of the Byzantine style.