
10,000 original leaded-glass windows.
The mansion features 10,000 panes of original leaded glass.
Source: Stetson Mansion [S13].

Quick answer: The Stetson Mansion in DeLand, Florida is the state's first Gilded Age luxury home, built in 1886 for hat-making magnate John B. Stetson. Thomas Edison personally supervised the electrical installation. President Grover Cleveland and King Edward VII were among the Stetsons' guests. It operates today as historic tours and an event venue.
When Henry A. DeLand heard that his friend John Stetson was seeking a warmer climate for his health, he invited him to Central Florida. Stetson purchased 250+ acres for an orange grove and completed his winter mansion in less than a year [S13, S14].
Four sourced claims that define the mansion's Gilded Age stature.

The mansion features 10,000 panes of original leaded glass.
Source: Stetson Mansion [S13].

Some of the nation's rarest and most intricate parquet flooring, in sixteen distinct geometric patterns.
Source: Stetson Mansion [S13].

Thomas Edison personally supervised the electrical installation — one of the first homes in the world designed and built for electricity.
Source: Stetson Mansion [S13], Visit Florida [S14].

Architectural historians cite the mansion as an excellent example of George T. Pearson's eclectic High Victorian style — Shingle-style with cottage, Gothic, Tudor, Moorish, and Polynesian details.
Source: Visit Florida [S14].
President Grover Cleveland, King Edward VII, the Vanderbilts, Astors, Tiffanys, Carnegies, and Mellons were all entertained at the mansion [S14].
The Stetsons were among Florida's first snowbirds, traveling from Philadelphia each year to enjoy six months in DeLand [S14].