 Spin triplet exciton condensation has been predicted in perovskite cobaltites in high magnetic fields. Here, the authors report the magnetic phase diagram of LAC-003 from magnetostriction measurements in ultra-high magnetic fields and reveal new high-field phases with signatures of the exciton condensate. This article was authored by Akihiko Ikeda, Yasuhiro H. Matsuda, Keisuke Sotto, and others.