Donald Edward Gingery, 69, a real estate developer in the Washington area and a former member of the Maryland-National Capital Park and Planning Commission, died of pneumonia Jan. 23 at his home in Somerset, Va. He had cancer.

In 1946, Mr. Gingery founded the Donley Construction Co. in Rockville and remained its chairman until his death. The firm built a number of large projects in Montgomery County, including the Twinbrook and Hungerford developments and the Oak Hill Apartments.

Mr. Gingery also was a former owner of the District Title Co. and a founder of the Old Line National Bank, which is now part of the Equitable Trust Co. At various times he had real estate interests in the Washington area and in Chicago.

He was appointed to the Maryland-National Capital Park and Planning Commission in 1949 and served on it through 1965. He also was chairman of the old National Capital Regional Planning Council when it joined the affiliated National Capital Planning Commission in officially proposing what became the Metro subway.

Mr. Gingery was born in Clearfield, Pa. He grew up in Washington and earned a law degree at the old Columbus University Law School. He began his career in the construction business in the 1930s and worked for the Bruninger Construction Co. until founding his own firm.

In addition to his home in Somerset, where he had a farm, he maintained a residence in Chevy Chase.

Survivors include his wife, Mary Helen Gingery, of Somerset and Chevy Chase; four sons, James Montgomery of Bethesda, Donald Edward Jr. of North Beach, Md., Gregory William of Rockville, and Michael C. of Chevy Chase; a daughter, Mary Ann, of Chevy Chase, and one grandchild.