 Schroeter-Huhn proposal, if executed, would have been the largest Neo-Byzantine structure of its time.The client - viceroy of the Caucasus Mikhail Nikolayevich - dismissed the Schroeter-Huhn proposal as too expensive; he supported the Grimm-Gedike draft but instructed the architects to decrease its size to cut costs.The building that was completed in 1871-1897 followed the original Russian scheme of a single dome with four symmetrical apses created by Roman Kuzmin in 1861, yet Grimm changed his proportions to create a tall, vertical silhouette.