Teachers in the Shoreline Unified School District are seeking an unprecedented $20,000 pay raise next year for each of the district’s 51 teachers, citing sky-high housing costs. The union says the substantial increase is needed to hire and retain quality staff.

“With a starting salary of $64,000, our new and less experienced teachers can’t afford to live within an hour of our schools. They can’t afford to live on their own,” said Dee Lynn Armstrong,…