Question: Who built the both the Union Church of Pocantico Hills and and Kykuit?
Sentence (from "Union Church of Pocantico Hills"): Upon the death of Rockefeller's wife Abby Aldrich Rockefeller in 1948, their son Nelson Rockefeller had Henri Matisse design the church's rose window in honor of her memory shortly before the artist's own death in 1954.
Relevant evidence: No