Buckingham Palace

 is a limited-time premium building that was released on April 6, 2018, as part of Act 2 of The Springfield Jobs 2018 Event.

Regular
Willie
 * Challenge Guards to a Fight - 4h

Quest Based
Homer Lisa
 * Salivate - 4h
 * Watch the Changing of the Guard - 4h

Trivia

 * Only one can be obtained.
 * It can be placed on grass, pavement, dirt, boardwalk, pier, edge of boardwalk, or edge of pier.