Some collectors will winnow their holdings to make room for more items or to upgrade their collection. For art collectors John Shannon and Jan Serr, upgrading was beside the point; they bought for love, not investment. With more than 3,600 artworks—from Henri Matisse through David Hockney and contemporary artists from around the world—and no place to display or safely store the entire collection, the couple developed a business, Guardian Fine Art Services (1635 W. St. Paul St.), in a five-story building constructed in 1924. Aside from housing Shannon-Serr’s artwork, Guardian rents space to other collectors, providing a secure environment for irreplaceable items.​