The massive blaze, which could be seen from space, was first reported around 5 p.m. local time, KGO-TV reported.
The San Jose Fire Department said in an update Sunday morning that crews remained on the scene conducting fire watch, as the fire was still smoldering and producing light smoke.
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The department said those in the path of smoke are advised to continue to shelter in place with windows/doors closed. A press conference was expected later in the morning.
No injuries to fire personnel or citizens were initially reported related to the incident.
The National Weather Service of the San Francisco Bay Area said the structure fire could be seen from space. The cause of the fire remains under investigation.
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