The Japanese tore down the inner wall of the fort and used the stones to build a rectangular platform on which they built Japanese-style residence quarters and Western-style offices, creating the present Fort Anping. When the Japanese nationalized the town's chief commerce and opened Kao-hsiung harbor, Anping fell on hard times once again.
日本人將熱蘭遮城的內城剷平，以紅磚建一座長方形的階梯平台，平台上蓋日式海關長官宿舍，平台下則建為普通宿舍及民房；到民國十九年日本人又把房舍全部拆除，只留下平台，再蓋上一棟西式洋館，就是今天所稱的「安平古堡」。