I have a house on Test Center that I placed a few months ago. I added some co-owners and a friend to its security list tonight, as well as gave a character access to the house. Took screen shots for every step.
Then I used the house owner to place another house nearby on Test Center, which caused the first house to start to decay.
After placing the second house, the security listing on the first house still had the same names on the co-owner, friends, and access lists. I was also able to make a character from yet another account a co-owner on the first house after it began to decay.
I don't have any idea when this house is going to hit the final stage in the IDOC process. I will try to keep an eye on it but make no guarantees I'll catch it as it changes stages. It went from "fairly new" to "slightly worn" within a matter of mere minutes.
I also don't know if there was any point to doing any of it as the publish notes say we won't see these changes until everything hits the production shards.
Anyway, here are screen shots from TC this evening, for whatever they're worth.
Information screen confirming date/time of placement several months ago:
View attachment 29077
Security settings before placing another house on TC with same account:
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Confirmation gump to place another house on TC:
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"Condemned" message on first house after placing second house on TC:
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"Like new" status on house sign:
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Security settings after second house placed:
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Able to name an additional co-owner after second house placed:
View attachment 29086