鉄骨 てっこつ構造 こうぞうじゃありませんでした
tekkotsu kōzōjārimasendeshita

Noun
Desu Copula

The polite, past negative form of 鉄骨構造

1. Was not a steel structure.; Was not made of steel.

Past/Perfective
Negative
Polite
Terminal Form