Cantham House

During a soirée Organa hosted in 22 BBY on the roof of Cantham House the disguised handmaiden Sabé saw Alderaanian plants and pieces of art that incorporated wind or water she noted that it must have cost a fortune but Alderaan had been a member of the Galactic Republic for a very long time.

Toward the end of the Clone Wars, Organa and his fellow senators Mon Mothma and Padmé Amidala organized meetings at Cantham House to discuss the Petition of 2,000, a set of demands by the Delegation of 2,000 group of representatives who were concerned with the state of democracy in the Galactic Republic that included Sheev Palpatine's relinquishment of his wartime emergency powers as the Supreme Chancellor. However, Palpatine refused to let go of his powers at the end of the war and further declared himself Emperor of the Galactic Empire succeeding the Republic.

In 3 BBY, when Organa's adopted daughter Leia Organa joined the Apprentice Legislature she stayed in Cantham House rather than a dorm like the rest of her fellow Apprentice Legislators.

During the reign of the Galactic Empire, after Mothma condemned Palpatine for his actions during the Ghorman Massacre, the Imperial Security Bureau arrived at Cantham House to interview Leia Organa and several other individuals due to suspicions the Bureau had about them.