B2-Rigidity irregularity between adjacent floors, that is, nki value is any i. It is the average relative story drift ratio at the floor divided by the average relative story drift ratio at an upper or a lower story. If a floor has very little displacement compared to the other floor, this value should be expected to be large. In your project, there are rigid curtains in the basement that are not on the upper floor. In this case, the average reduced relative floor offset value of the basement floor is very small compared to the upper floor. Notes; *In the example I added to the message, the nki value is max 16.02. *A1 and B2 Types Irregularities are the irregularities related to the reason for choosing the calculation method. There is no need to check for these irregularities when Dynamic Analysis is performed. (TDY article 2.3.2.1)