The Kronprinzenpalais is a former Royal Prussian residence on Unter den Linden boulevard in the historic centre of Berlin. It was built in 1663 and renovated in 1857 according to plans by Heinrich Strack in Neoclassical style. From 1919 to 1937, it was home to the modern art collection of the National Gallery. Damaged during the Allied bombing in World War II, the Kronprinzenpalais was rebuilt from 1968 to 1970 by Richard Paulick as part of the Forum Fridericianum. In 1990, the German Reunification Treaty was signed in the listed building. Since then, it has been used for events and exhibitions.