Text:
同じ頃のとある日曜日、20万の「メイド」と呼ばれる外国人家事労働者が働く香港のあるビルの一部屋では、演劇ワークショップを行うフィリピン人家事労働者たちの姿があった.
My translation:
Around the same time on a Sunday, 200000 'maids' - what foreign domestic house labourers are called - work in one room in a Hong Kong building. Filopino domestic house labourers who perform a stage workshop can be seen.
There's something wrong with my translation but I can't pick it up. Are there really 200 000 maids in one building or one in each building? Can someone help me tell me why I'm wrong? And what a good translation would be?