Tenshudai was constructed with intention to construct Tenshu, or construction of Tenshu was planned, but it was not realized due to deference to the Bakufu or economic difficulties (Fukuoka-jo Castle, Ako-jo Castle, and so on).
天守を造営するつもりで天守台までは築いたか築く計画はあったが、幕府に遠慮し、または財政難から全く建てなかったケース（福岡城、赤穂城など）。