When my son put his new recycling plant on a wrong spot he tear it down to replace it, i was looking and it had a yellow star, even so it didnt return to the star menu. My wife did put up her new silo and that does NOT have a star, and when u hower over with "tear down" it says u get resourses back. to be sure i build my silo to, and ... just the same no star. as i havent heard/ read enything about this event buildings shud be different from the standard ones i guess this is a tiiiiny bug. https://s27.postimg.org/aqgbocxdf/silo.jpg