Held as an escrow, that is, in the custody of a third party until some condition or conditions (of an agreement, bequest, etc.) have been fulfilled. The sum of money my late grandfather bequeathed to me will be in escrow until I turn 18.
in escrow
In trust with a third party for delivery after certain conditions are fulfilled. For example, Our down payment on the house is in escrow until the current owner makes the promised repairs . This legal term dates from the late 1800s.