軽量 けいりょう鉄骨 てっこつ構造 こうぞうだったら
keiryō tekkotsu kōzōdattara

Noun
Da Copula

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

1. If/when it were a lightweight steel frame structure.; If/when it's a lightweight steel frame structure.

Tara Conditional