noun
Crown Prince's Palace
Refers specifically to the residence of the Crown Prince of Japan. A formal, proper noun.
東宮御所は皇太子殿下の御住まいです。
The Crown Prince's Palace is the residence of His Imperial Highness the Crown Prince.
Compound of 東宮 (tōgū, 'Crown Prince') and 御所 (gosho, 'imperial palace').