Four of the following five are alike in a certain way based on the above arrangement. Find which one does not belongs to the group?

Study the following information carefully and answer the questions given below: There are nine persons –  P, Q, R, S, T, U, V, W and I   are living on 3 floors (numbered 1 to 3) of a building. There are  three different flats on each of the three floors.   Flats are X, Y, & Z such that Flat X is exactly to the west of flat Y and flat Y is exactly to the west of flat Z.  Flat X of floor 2 is exactly above the Flat X of floor 1 and so on. V lives just above R whereas V lives in Flat Z. P and R doesn’t live on the same floor. U lives just above P but not in the same flat. U  and W live in the same flat, whereas W lives east of T. Only one person lives between I and Q, and they are living on the same floor. The one who lives west of S lives in the same flat in which I lives.