One of Mihalović's greatest accomplishments was the restoration of the Zagreb Cathedral. In 1874, bishop Strossmayer, who had large estates throughout Slavonia, started collecting funds for the Cathedral reconstruction. One of the promoters of reconstitution was also Josip Stadler. Reconstruction was interrupted on 9 November 1880 by a 6.3 magnitude earthquake that struck Zagreb. Although only one person was killed in the earthquake, it destroyed or damaged many buildings, including the cathedral. From a total of 32 altars, only 3 were kept after renovation. After the earthquake, the reconstruction of the cathedral was conducted between 1880 and 1902 in the neo-Gothic style by the architect Hermann Bollé with funds provided by Izidor Kršnjavi.