Promont was built in 1865 by William McGrue on a hill above the village of Milford, OH and the Little Miami River.

The Italianate Victorian home was purchased in 1879 by John M. Pattison, 43rd Governor of Ohio.

[2] Promont served as the Governor's residence during Pattison's term in office.

Pattison directed the state government from Promont until his death on June 18, 1906.

[3] Promont remained a private residence until 1983 when it was donated by James Kirgan to the Greater Milford Area Historical Society.