PURPOSE:To effectively utilize a three-dimensional urban space by forming artificial recessed platforms in multiple layers at intervals in the vertical direction of gigantic pillars erected at intervals and, at the same time, inclining outward the outside and inside side walls of the peripheral sections of the platforms. CONSTITUTION:A plurality of gigantic pillars 3 respectively composed of an upper section 3a and lower sections 3b and 3c are erected at regular intervals along a circumference on a foundation. Then artificial recessed platforms A-N are formed by surrounding the platforms with peripheral sections, the outside and inside side walls of which are inclined outward. The artificial recessed platforms A-N are united to the gigantic pillars 3 to one body at intervals.
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