Galactic Alliance Security blockhouses were blockhouses for Galactic Alliance Security on the galactic capital of Coruscant. Jedi Grand Master Luke Skywalker was taken to one after his arrest in 43.5 ABY, however, he was released soon after.
Psychotic Jedi Knights Valin Horn and Jysella Horn were later encased in carbonite and eventually placed in a secret GA Security blockhouse, Detention Center 81, under the command of Yaka colonel Wruq Retk. The Jedi Order tricked the Head Judge of the Court of Jedi Affairs, Arabelle Lorteli, into giving them a document allowing them access to visit the Horns. A group of Jedi, accompanied by Mirax Terrik Horn and the press, arrived at the blockhouse to visit the Horn siblings, who were being held as office decorations in the executive level.