Former Owner
- John Reiner1
- John Rolls, 1st Baron Llangattock3
- John Rolls, 2nd Baron Llangattock1
- John Ruskin1
- John William Burns1
- John William Harshberger1
- Joseph May Spetzler1
- Joseph Pope1
- Julia Burgess1
- Karen L. Gould2
- Karl F. Morrison1
- Lathrop C. Harper, Inc.1
- Laurence Claiborne Witten II2
- Lawrence J. Schoenberg1
- Leonello d'Este, Marquis of Ferrara4
- Lewis L. Gould2
- Linda Ehrsam Voigts1
- Lisa Kiser1
- Louis d'Aumont de Rochebaron1
- Lucien Magne1