The end of World War I and the fall of the Austro-Hungarian Empire in 1918 marked the beginning of a new era: the formation of the Czechoslovak Republic, headed by the new nation’s first President, Tomáš G. Masaryk. As a result, a new set of laws were passed revoking the use of noble titles and implementing land and property reforms. Though greatly disadvantaging Maximilian Lobkowicz (1888–1967), son of Ferdinand Zdenko, 10th Prince Lobkowicz (1858–1938), Max demonstrated his support for the emerging First Czechoslovak Republic through his three decades of diplomatic service, while Ferdinand made rooms at the Palace available to the Prime Minister’s office. In 1939, the invading Nazi forces confiscated and occupied the Palace (headquarters of the Hitler Youth Organization), along with all other Lobkowicz family properties. The Palace was returned in 1945, only to be seized again after the Communist takeover in February 1948. For the next 40 years, the Palace was used for a variety of purposes, including state offices and as a museum of Czech history, operated by the National Museum.
After the Velvet Revolution of 1989 and the fall of the Communist regime, the family began the arduous restitution of their vast cultural heritage. Following a twelve-year legal process, the Palace was returned to the family in 2002. In April 2007, the family opened the Palace and its collections to the public with a permanent exhibition, The Princely Collections. They also restored the Palace’s historic rooms which are used for a museum gift shop, café & restaurant, concerts, and events.