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Heavy timber construction is an excellent choice for structural members to contain the damage until the fire can be suppressed. Looking at videos and photo's, not seeing conventional sprinkler systems but that doesn't mean they weren't there. Sprinklers are designed to control fires at their incipient phase and typically do so.
I would tend to think it wasn't sprinklered since it requires 90PSI at the head to work properly. Say they were only 1000 feet above the closest source of a decent water supply, that would take approx 500PSI to lift it there plus the 150 or so static to get a flow PSI of 90.
The other option would be water storage above it for supply which I can't see in any of the pictures.

Originally Posted by kach22i

From the opening link:

https://www.autoblog.com/2021/01/19/austria-alps-motorcycle-museum-fire/#slide-2290027


Fire protection systems (sprinklers) are designed to buy some time and this in turn will save lives, they are not intended to protect property. They are set up for a window of escape and to make rescue of human life by rescue teams unnecessary.

Timber construction is great because it takes a long time to burn though thick members and does not suffer from the decay of spray on fire protection coating clumping off of steel.

If it's not arson, that leaves electrical fire and lightning strikes. Being up top a mountain it could have been lightning.


10 things to know about thunderstorms that strike at night
https://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=135631



When Lightning Strikes in the Mountains | Survival Guide
https://marvelmountain.com/blogs/blog/when-lightning-strikes-in-the-mountains-survival-guide