Measure for Measure: Out of the corridors of power

Just a quick observation re: settings in Measure for Measure

I find it very interesting that the duke demands that in the final scene of the play he be greeted by Angelo “a league below the city” (IV.iii.98), outside the city gates. Up until this point, all of the play had taken place within Vienna (even the “moated grange” [III.i.262] at Saint Luke’s seems inside the city gates).

Is this because the resolution must take place outside the city limits, as the solution is not to be found within?

Comment?