From housing and hotels to an In-N-Out Burger and a miles-long riverbed trail, perhaps no other place in the Santa Ynez Valley anticipates as much change as Buellton. One of the most significant developments on the horizon is a $35 to $45 million Cottage Health medical building planned for the site of the old Parks Plaza Theatre. The shuttered movie house screened its last film in 2020, forced from business by the COVID-19 pandemic. The empty Pa…