What is the ruling on a husband's oath of divorce: "By divorce, I shall not leave this house except to this (new) house or a house I own," in the event of being forced to leave the house due to a governmental decision to demolish it, or the desire to move closer to the workplace, or the landlord raising the rent?

Simply moving from the house due to distance or increased rent does not prevent a divorce from occurring, unless there is significant harm that necessitates the move, in which case it would resemble coercion. However, if a demolition order for the building is in effect and could be executed at any moment, then the divorce does not occur.