Grace-St. Luke's cares for a magnificent Tiffany stained window that dates back to 1900, and six other defining windows from the turn of that century. That year, one of the benefactors of Grace Church, Mrs. W. A. Gage, met a representative of the Tiffany Glass Company at the Paris Exposition. She personally underwrote a signature window depicting Christ's ascension to be hung above the altar. Louis Comfort Tiffany personally supervised its installation. The vestry commissioned six more windows in 1907 long thought to be the work of Tiffany as well, but recent evidence suggests those six were Gorham windows, a significant Tiffany competitor in design and technique. Grace brought all seven to St. Luke's when the churches merged in 1940, spectacular reminders of the two parishes becoming one. Window scholars recognize the Ascension window, now hanging over the main doors of the church, as a prime example of the Tiffany palette.