既存きそん適格てきかく建築けんちくぶつであれば
kison futekikakukenchikubutsudeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 既存不適格建築物

1. If/when it is an existing ineligible building.; If/when the building is existing and ineligible.

Ba Conditional