 Of these buildings many have been retained in the city's older Sobornyi District.Amongst the most important buildings of this era are the Transfiguration Cathedral, and a number of buildings in the area surrounding Akademik Yavornitskyi Prospekt, including the Khrennikov House.Over the next few decades, until the October Revolution in 1917 the city did not change much in appearance and the predominant architectural style remained that of neo-classicism.