When Henri Maysonnave died in 1989, his farmhouse and its garden were bequeathed to his beloved City of Sonoma, with the stipulation that it be used for art, cultural or museum purposes.

Recognizing the historic value of the property, the Sonoma League for Historic Preservation secured a long-term lease from the City of Sonoma for Henri's house.

In 2008 the League completed its restoration of the property that now houses the League's archives and serves as its "Heritage Center" where lectures, meetings, exhibits, and receptions are held.