After the so-called "Ausgleich" of February 1867, the Austrian Empire was reformed into a dualist Austria-Hungary and a slow yet steady process of liberalisation of Austrian rule in Galicia started. From 1873, Galicia was de facto an autonomous province of Austria-Hungary with Polish and Ruthenian, as official languages. Germanisation was halted and the censorship lifted as well. Galicia was subject to the Austrian part of the Dual Monarchy, but the Galician Sejm and provincial administration, both established in Lviv, had extensive privileges and prerogatives, especially in education, culture, and local affairs. In 1894, the General National Exhibition was held in Lviv. The city started to grow rapidly, becoming the fourth largest in Austria-Hungary, according to the census of 1910. Many Belle Époque public edifices and tenement houses were erected, with many of the buildings from the Austrian period, such as the Lviv Theatre of Opera and Ballet, built in the Viennese neo-Renaissance style.