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下さるとは

that you would kindly…

→ 下さる
phrase Rare #45,840
that you would kindly… 下さる is a polite, honorific way to say someone does something for you. とは adds a sense of surprise or unexpectedness.
JA: 手伝って下さるとは思いませんでした。
EN: I didn't expect you to help me.

私は・・・製作者さんも来て下さるとは・・・

I never expected the creator to come too...

— ８ 1／2 (1963)

そう言って下さるとはご親切にありがとうございます。

Thank you for saying that; that's very kind of you.