高等 こうとう商業 しょうぎょう学校 がっこうだったら
kōtōshōgyōgakkōdattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 高等商業学校

1. If/when [it] were a higher commercial school; If [it] were a high school of commerce

Tara Conditional