[1] The majority of these were residential houses, but they also designed manufacturing plants, synagogues and public institution buildings.
[2] Hönigsberg then trained at the studios of Ludwig Tischler (1883–84) and Anton Krones (1885–86), while Julije Deutsch worked for a time in Paris with Camille Lefèvre.
In 1889 they founded the Hönigsberg & Deutsch bureau, which soon grew into one of the largest building companies in Zagreb.
Hönigsberg & Deutsch's buildings are regarded as some of the finest examples of late historicism architecture, with an eclectic mix of Renaissance Revival, Baroque and Rococo elements, while the Pečić House (1899) and Kallina House (built in 1904 and designed by Vjekoslav Bastl for Hönigsberg & Deutsch) marked a break with the traditionalist style and are considered amongst the finest examples of Secessionist-style architecture in Zagreb.
[8] Projects built after 1900 were mostly works of other architects working at the studio, including Vjekoslav Bastl, Ivan Štefan and Otto Goldscheider, and the company also contracted construction projects for many buildings in Zagreb designed by other architects, such as the Croatian National Theatre, (designed by Fellner & Helmer, 1895), the Croatian Discount Bank (Fellner & Helmer, 1899), the Art Pavilion (Fellner & Helmer, 1898), the Royal Forestry Agency building (Kraljevsko šumarsko ravnateljstvo, Alexander Aigner, 1899), the State Railways building (Direkcija državnih željeznica, Ferenc Pfaff, 1903), and the admissions building of the Šalata Hospital (Dionis Sunko, 1909).