In 1982, the City of Mason established the Historic District Commission (HDC) through a city ordinance. Its purpose and function is to safeguard the historical heritage of the City of Mason in designated areas. A historic district was created that encompasses the downtown section of the city (see map below for details). The charge given the HDC is consistent with the National Historic Preservation Act of 1966 and later amendments to foster civic beauty and pride, promote the use of historic districts for the education, pleasure, and welfare of Mason's citizenry, and to improve and stabilize property values in historic districts. The Mason Historic District Commission is charged with reviewing plans for construction, alteration, moving, exterior changes, signage, or the demolition of all buildings in the historic district.

The HDC is composed of seven members, appointed by the City Council, with various backgrounds and expertise who all share an interest in historic preservation. It normally meets the fourth Monday of each month at 7:00 p.m. at the City Hall Council Chamber. There are occasionally times when holidays or special "on call" meetings deviate from the established meeting dates so it is advised to call the Director of Planning/Zoning to confirm specific times. All meetings are open to the public and individuals are encouraged to attend and participate in the activities of the Commission.