Most, but not all, staff were temporarily relocated to Cardiff and Merthyr Tydfil Welsh Government offices while a long-term solution was sought.
Cafodd y rhan fwyaf o staff, ond nid y cyfan, eu symud dros dro i swyddfeydd Llywodraeth Cymru Caerdydd a Merthyr Tudful nes canfod ateb hirdymor.