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Reentrant corner irregularity is defined to exist where dimensions of projections in both plan projections of the structure beyond a reentrant corner are greater than 15% of the plan dimension of the structure in the given direction.
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of the two perpendicular directions in plan exceed the total plan dimensions of that story of the building in the respective directions by more than 15%
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In buildings with reentrant corner-type irregularities, story slabs is modelled are modeled with two-dimensional plate dimensional plates (membrane) or or finite shell finite elements to show that they are able to can safely transfer earthquake forces between vertical bearing system elements in their own planes.
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ASCE Earthquake Regulation Code Statement - Reentrant Corner Irregularity, ASCE 7-16