The old parliamentary building of Germany was tragically destroyed by a fire before the war which Hitler blamed on the Communist to create national distain for the party. It lay vacant until 1945 when Berlin came under attack from the Russian Army. It was held for 3 days by members of the SS until it finally fell and the Hammer and Sickle flew from the roof.
The building in CoH is actually several building but together to replicate the shape. It also features many small accessories for detail and the dome is meticulously constructed from thousands of fence post.