Henry Ford Hospital officially opened Oct. 1, 1915, when the first patients were admitted to this 48-bed facility. Known today as the M-Unit, this building is the original hospital building and the oldest building on the famed campus. It is also a rare survivor in Detroit of historic medical-related buildings.

Designed in the Georgian Revival style, the two-and-a-half-story building features red brick walls, limestone trim, and a red clay tile hip roof, giving it the appearance of a stately Georgian country house. Its symmetrical façade is highlighted by a limestone-clad central entrance, projecting end pavilions, decorative limestone quoins, and dormer windows. The building was designed by the Detroit firm Stratton & Baldwin.

Henry Ford Hospital was one of the first in the country to adopt a standard fee schedule and emphasize private and semi-private rooms rather than large open wards.

Expansion began in 1917, when the cornerstone for a new hospital building was laid and construction started on a design by architect Albert Wood.

The M-Unit remains a significant architectural landmark and an enduring symbol of Henry Ford Hospital's pioneering approach to modern health care.