McMahan Homestead, also known as Landmark Acres, is a historic home located in Westfield in Chautauqua County, New York.

It is a two-story, five bay wood frame dwelling built in about 1820.

The home features a semicircular portico with a denticulated cornice and corinthian columns that was added in the 20th century.

Chautauqua County celebrated its 100th anniversary, 1902, on the front lawn of the McMahan homestead.

This article about a historic property or district in Chautauqua County, New York, that is listed on the National Register of Historic Places, is a stub.