What happens to unique buildings in occupied cities?

The Paper Maker and the Wat are transformed into a Library and a University. The other unique buildings I tried were destroyed.

I'm pretty certain that some classes of buildings are always destroyed, but there is probably also a random factor.

The XML files have some information about it, the probability of capture for the unique buildings is the following

Longhouse          66%
Bazaar             75%
Satraps Court      75%
Paper Maker        66%
Wat                66%

For the other unique buildings there is no value given, I assume that they are always destroyed.

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