The announcement was made Saturday night at the Indiana Landmarks Rescue Party.
The Peters-Margedant house is in danger of being removed from Evansville unless local advocates can raise money by October to buy, move and restore it.
The home is currently located in the 1500 block of East Indiana Street.
The 1935 home was designed by William Wesley Peters and may rank as the first Usonian house in the nation; pre-dating even Frank Lloyd Wright's inaugural Usonian house, built in 1937.
Experts believe the house possesses national significance; illuminating how Wright's work may have involved collaboration with Peters.