The Fred B. Jones House is part of an estate called Penwern in Delavan, Wisconsin, designed by Frank Lloyd Wright and constructed from 1900 to 1903.

[2] Fred Jones was a Chicago bachelor-businessman who had this estate on Lake Delavan built as a weekend cottage and a place to throw summer parties.

The boathouse was built first, in 1900, with rising ridgepoles and flaring eaves that suggest Japanese architecture more overtly than most of Wright's designs.

The main house was built in 1901, with gable roofs, a living room facing the lake, and broad arches, one over a porte-cochère.

The gatehouse was built in 1903, with a gable roof, two Gothic-like dormers, and a two-story tower to which the men could retreat for late-night poker.