Spokane County would save at least $87,000 a year by expanding its existing juvenile jail instead of leasing more beds at a regional center that opens next year, a Seattle consultant says. The report by Christopher Murray & Associates, paid for by a $3,000 state grant, raises questions about the county's extended involvement in Martin Hall. Martin Hall will open next spring under private management in a renovated building on the Eastern State Hospital campus at Medical Lake. The Legislature has loaned a consortium of nine Eastern Washington counties the $3 million in renovation costs.