軽量 けいりょう鉄骨 てっこつ構造 こうぞうであれば
keiryō tekkotsu kōzōdeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 軽量鉄骨構造

1. If it is a lightweight steel frame structure; Assuming it's a lightweight steel frame structure

Ba Conditional