 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.Grimm's draft, publicised in the 1860s, paved the road to numerous variations of the same single-dome layout and was perfected by Vasily Kosyakov in the 1880s.Grimm's last design, the burial vault of Grand Dukes in Peter and Paul Fortress, remained on paper