Gray rectangle in the sky with small whitish square on the bottom center

We were driving from Lebanon Kroger down Columbus Avenue headed toward our home at LA Luz Apartments. As we were passing the car wash, my daughter asked, "what is that?" It took a few seconds to zero in on what she was seeing. I relied to her that it looked like a gray flag but it was up way too high in the sky to be a flag. It was up near the clouds and hovered there before disappearing behind a cloud. It was seen in the sky near the water tower by Lebanon Commons Apartments (very near our home.)