Our building, known as "The Rock Building," holds a special place in Sanger's history as the town's first permanent structure. Built in 1890 by the Huling family using rock from Ganzer Hill, it has served as a store, bar, café, and even as City Hall with a fire station in the rear. In 1900, the property was purchased by John J. and Emily Ann Sullivan, prominent Denton County pioneers who had 14 children, including Dr. John Morgan Sullivan.

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Born on February 7, 1885, in Sanger, Dr. John M. Sullivan was a dedicated physician who returned to his hometown after completing medical school at Fort Worth and Baylor University. Married to Charlotte Elizabeth Gambill in 1916, he became a beloved figure in the community, known for his tireless service, even swimming across creeks to reach patients and delivering an estimated 3,500 babies during his 47-year career. Dr. Sullivan was also a committed member of the Methodist Church, Masonic Lodge and a charter member of the Lions Club of Sanger. He passed away on February 1, 1958, in Denton, Texas, and is buried in Roselawn Memorial Park.

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Dr. Sullivan’s legacy continued through his sons, Nelson Gambill Sullivan and John L. Sullivan. Nelson, born in 1917, served as a Colonel and lived to the age of 85. John L. Sullivan, born in 1918, became a prominent attorney in Denton and served as Sanger's City Attorney for 25 years. In 1985, Nelson Gambill Sullivan deeded the historic building, which had been in the Sullivan family since 1900, to the City of Sanger in memory of his parents and brother. Today, this cherished landmark at 200 Bolivar Street serves as the Sullivan Senior Center, a lasting tribute to the family's deep roots in the community. A historical plaque placed by the Sanger Area Historical Society in 2002 proudly marks the front of the building.