Building structure

The ornamental design for a building structure, as shown and described.

FIG. 1 is an enlarged front perspective view of the building structure showing three sides thereof, as viewed from the center downward in FIG. 2.

FIG. 2 is a top plan view of the building structure of FIG. 1, however shown in its entirety; and,

FIG. 3 is an enlarged fragmented view of a portion of the building structure shown in FIG. 1.

The broken lines are for illustrative purposes only and form no part of the claimed design.

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D599489,	Jul 08 2005	SPIRIT OF AMERICA CORP	Plastic media filled blast/ballistic mobility wall
D927728,	Feb 23 2018	SAFE SKIES, LLC	Trade show booth display
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