Eighteen people at an Arroyo Grande assisted living facility were displaced after a fire broke out Thursday night, according to Five Cities Fire Authority Battalion Chief Craig Angello.It was reported shortly before 5:45 p.m. at the Alder House at 295 Alder Street.Angello says the damage was minor and isolated to the entryway. While the exact cause is under investigation, he says the fire appears to have been sparked by electrical items inside.T…