There in 1855 he married Nancy J. Preble; the couple had three daughters: Tacy, Fauna, and Isabelle, and adopted a son, Frank.

[3] Cobbs & Mitchell was among the largest lumbering firms in Michigan, supplying hardwood flooring and other products to consumers.

[3] Jonathon W. Cobbs remained active in the business until approximately 1895, when he fell ill and turned over his duties to his son Frank.

[5] In 1905, Cobbs & Mitchell hired George D. Mason of Detroit to design this brick and limestone building as a showplace for their products.

[6] In April 2017,[7] philanthropist, real estate developer and investor, Robb Munger became the owner of the Cobbs and Mitchell historical building.

Robb Munger has restored and updated the historical landmark including preserving the vintage woodwork, creating a handicap access (including an elevator) and replacing the old boiler system with a modern HVAC system that will better preserve the historical landmark.

[9] [10] The Cobbs & Mitchell Building is a single story Classical Revival structure built of brick and limestone with a hip roof.