thanks Jotham, that's good info.
You're the second person to mention that officials might stop by.
So far I've been at this current address more than 2 years but no one has come by yet.
I was using an accountant here in Taichung, but they already got some things wrong in the past so I stopped using them and did all my renewal stuff by myself. (couldn't have done it without the guides here).
I'm leaning towards passing on this house just cause I shouldn't have to be doing any worrying just so someone who owns multiple properties can save a whopping 2k-3k a month.