 The exterior of the building is made of gray granite.Walls, cornices, columns are richly decorated with northern art nouveau inspired sculptures and bas-reliefs by two notable period sculptors Vasily Kozlov (Vassili, Василий Васильевич Козлов) and Leopold Dietrich (Леопольд Августович Дитрих).After 1917 Kozlov and Dietrich became official Soviet sculptors of the social realism persuasion.