The north building of the studio was referred to as the Guest House during Marland's time. Several of the artists who were helping create the magnificent interior of the mansion stayed here. In the early 1930's, when they could no longer afford to live in the mansion, E.W. and Lydie moved into the Guest House, and only opened the mansion for parties and special occasions. During Marland's political years, they returned here some weekends. When Marland's term as governor was over, he and Lydie moved back into the Guest House until the remodeling was finished at the chauffeur's cottage.
The Marland Oil Museum now occupies this north building of the Artist Studio. As a celebration of their 125th. anniversary, Conoco funded the creation of the new exhibits and also restored the original building. The new museum opened in April, 2001. The Marland Oil Museum is a tribute to E.W. Marland and the innovations he made in the petroleum industry that are still in existence today.