The little house at 25 E. Cedar, once home to Frank Lloyd Wright and now endangered, apparently by construction of a mansion next door, may have another claim to fame: it was most likely converted from a 19th century coach house by another significant Chicago architect, Benjamin Marshall. Brian Goeken of the Commission on Chicago Landmarks says the evidence isn’t definitive, but Marshall’s archive, now at the University of Texas, includes a reference to a project on that spot, and a building permit was issued for work there in 1909. Marshall’s roster of work includes the Drake and Blackstone hotels and the South Shore Country Club. It wouldn’t be surprising if this small gem was also his.