軽量 けいりょう鉄骨 てっこつ構造 こうぞうでしょう
keiryō tekkotsu kōzōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 軽量鉄骨構造

1. Probably a lightweight steel frame structure.

Polite
Presumptive
Conjecture