I also had a look at the underside of the leaf from the parking lot verses the one I’m growing from seed. The first one from the parking lot definitely looks more hairy on the underside.
That looks like a White Mulberry leaf to me. I’ve never actually taken a magnifying glass to a Red Mulberry, but most ID guides describe them as having hairs all over the undersides of their leaves, whereas White Mulberries only have hairs along the major veins (as shown in your pics).
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