Mellon Financial Corporation said Monday that it has agreed to purchase Safeco Trust Company from Safeco Corp., and that the move would be completed within the next 30 days.

Safeco Trust, the Seattle-based Safeco subsidiary that handles estate planning and other services to families with $1 million or more in assets, is the fifth private wealth management acquisition by Mellon in the past four years. Terms of the deal were not disclosed.

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