“We did a big Halloween display called Boney Island, and everybody’s been coming by, grown up people saying ‘I was here when I was, you know, 12 and 13,’ and that’s nice to hear,” Mr. Polizzi said.

LOS ANGELES - The tree house has been featured on international TV shows and was the centerpiece of the Boney Island Halloween displays. But now, the city is after the treehouse, demanding its ...