Surely I am not the only native speaker who finds this rule about never using object's object over-applied.
There are absolutely times when you can use the possessive for a non-human element.
The building's main entrance is closed, so I'll meet you at the side door.
This summer will be my town's 250th anniversary.
Look at this table - I like it better. See, the legs on that table are plain and blocky, but this table's legs are carved and pretty.
I understand that learners learn a rule and THEN learn the exceptions, but this strong empahasis on NEVER using the 's for an object is not, in my opinion, a reflection of the actual use of the lanague.
[not a teacher]