The first Hall I attended in both southern and northern California were houses that had been purchased and the interior walls removed. These had windows. All well-covered with heavy, light-blocking drapes, but they were there.
When we built the first Hall in Morgan Hill (CA), there were no windows. What could you possibly want to look out at, with all that good spiritual grub being laid out inside? The peaceful walnut orchard in the back? The neighbor's beautiful peacocks? The soon-to-be DFed middle-aged brother grabbing a smoke in the parking lot? Oh, actually you could peak out at the parking lot - the doors were glass, though curtained!