Bonnet House’s modern history began when Birch gave the Bonnet House property as a wedding gift to his daughter Helen and her husband, Chicago artist Frederic Clay Bartlett in 1919. The newlyweds began construction of Bonnet House in 1920, eager for a winter retreat where Frederic could pursue his artwork and Helen could compose music and poetry.

Tragedy struck in 1925 when Helen died from breast cancer. Frederic’s visits to Bonnet House then became sporadic until 1931 when he married Evelyn Fortune Lilly. With this marriage, a renaissance occurred on the site as Frederic and Evelyn entered a prolific period of embellishing Bonnet House with the decorative elements that delight visitors to this day.

Frederic died in 1953, but Evelyn continued to return each winter. In 1983, Evelyn Fortune Bartlett gave Bonnet House to the Florida Trust for Historic Preservation. Her contribution—at the time, the largest charitable gift in Florida history—ensured that the site would be preserved for the enjoyment and education of future generations.