This is the famous TransAmerica Pyramid, the second tallest building in San Fransisco. The structure has no finished interior. It is 256 blocks high and has 42 rows of windows, compared to the real building, which is 260 meters tall with 43 rows of windows. The dimensions match closely. It goes up to world height from y=0.
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The pictures were taken with Sildur's Vibrant Shaders