Upper triangular operator matrices with the single-valued extension property

If A=(Aij)1⩽i,j⩽n∈B(X) is an upper triangular Banach space operator such that AiiAij=AijAjj for all 1⩽i⩽j⩽n, then A has SVEP or satisfies (Dunford's) condition (C) or (Bishop's) property (β) or (the decomposition) property (δ) if and only if Aii, 1⩽i⩽n, has the corresponding property.