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Foreground is a third. Building a third. Sky a third.
It's a three part symmetry.
Symmetry is defined by the traits of equal balance visually and/or similar mirror-image pattern.
The pattern symmetry here is the left <> right mirroring in the building and foreground, not up<>down between the three elements: sky, building, foreground. As for balance? Your eye may find equal balance vertically between the big sky as posted and other two elements but I find the color contrast makes the overall balance top heavy: my eye keeps getting pulled past the buliding into the large gap above it. Gaps in photos invite exploration. If you create one at the top of the photo with the sky the eye will go there—sooner or later—moving off the more important focal points.
The similar mirroring symmetry in the building and foreground connect them. There's no similar pattern connecttion between those two and the sky. The first two are focal points, the sky is not. If there was vertical symmetry the photo would have THREE equally compelling focal points.
It's compelling well executed two-part pattern symmetry under a contrasting, mostly plain blue sky; not three part symmetry. Reducing the size of the "gap" between building and top edge of frame modulates the temptation to wander up off the building into the sky.
The dynamic is similar to seeing a fence blocking your path and slowing down before running into it. The size of the sky gap will control the movement eye up in the frame and how soon it turns back down from building for another look at the foreground. The best way to see this dynamic is crop the sky 3-4 different amounts, then by comparison determine which seems to have the best visual balance. I did it by scrolling the photo in the browser window to compare.