San Diego approved a $15 million contract Monday for upgrades and renovations to the city’s three municipal golf courses, including preparations at Torrey Pines to host next year’s U.S. Open.

The City Council unanimously approved the joint contract with four separate companies that will each perform parts of the work. Individual projects are expected to cost between $250,000 and $2.5 million each.

The city’s municipal courses include the north and south courses at Torrey Pines, 18-hole and nine-hole courses at Balboa Municipal, and the lighted Mission Bay executive golf course.