Buildings auto clearing? turn on your X-MAS lights to let your neighbors know...
I'm having the same problem (iOS) your not the only one :(
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..UPDATE... I downloaded the most recent update (android) ver 4.16.9 . It has been a few hours and all seems to be working again. My buildings have not reset since update. Unfortunately they LZ has been changed to the S.H tunnel. I was just starting a much needed redesign and was going to use S.H as a junk area for my house farm etc. To keep it out of my Springfield but i don't want that to be the frist thing my neighbors see in my town :(
