Orono residents voted on Tuesday to borrow $16.8 million to pay for new construction and repairs at the town’s school buildings. In the largest voter turnout for a non-gubernatorial June election in 20 years — a turnout of 9.9 percent — the vote passed in favor of the borrowing package 631-417. The average tax increase from the bond will be $290 per year for an average home of $170,000, said Brian McGill, chair of the Regional School Unit 26 school board. [Subscribe to our free morning newsletter and get the latest headlines in your inbox] “Our buildings are showing their age,” Superintendent Meredith Higgins said at a public forum in March about the need for the facilities upgrade.