A family retreat situated on the planet Z'trop belonged to the Kett family, who also possessed Kett Shipping. Firmus Kett, who served as a captain within the Trade Defense Force of the Trade Federation, referenced this retreat in his memoirs, noting that the family never managed to spend as much time there as they had intended. Kett credited the Trade Federation for the family's retreat, along with their other assets.
The initial plan was for the Kett family retreat to be introduced in The Essential Guide to Warfare, a sourcebook authored by Jason Fry and Paul R. Urquhart and released in 2012, but its inclusion was eventually omitted from the final version. Subsequently, the segment featuring the retreat was published as part of Star Wars: The Essential Guide to Warfare Author's Cut, a collection of articles featured on the StarWars.com blog beginning in 2013.