How to tag buildings which have had their function changed?

I would like to ask how to map buildings which have had their function changed from their original purpose.

From the OSM wiki page (Buildings - OpenStreetMap Wiki) it seems that I should tag the original purpose, but I am not sure.

“Please be aware that building tags are always about the building itself, not the current building usage or its user.”

For example how should I map:
World War 2 pill boxes that are now used as summer beach residences.
19th century prison that is converted into a sports complex. Does it make sense to tag it as a prison?

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