Breakdown of kono tatemono ni ha anzen kisoku ga hituyou desu.
ですdesu
to be
はha
topic particle
がga
subject particle
にni
at; on; in; to; for [indirect object particle]
このkono
this ... adnominal
安全anzen
safe
建物tatemono
building
必要hituyou
necessary; necessity
規則kisoku
rule; regulation
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