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contract; commitment
「建て」 has another reading with different meanings.
indicates storeys, structures, or materials used in a building
二に階かい建てだての家いえに住んすんでいます。
I live in a two-story house.
木造もくぞう建てだての古いふるい家屋かおくです。
It's an old wooden building.
三さん階かい建てだてのビルを借りかりました。
I rented a three-story building.