S. Richard Rio, 87, an architect and principal of the Annandale-based firm of Beery, Rio and Associates from 1961 to 1981, died July 29 at a nursing home in Houston of complications following a stroke.

During his career as an architect, Mr. Rio had been a consultant to the Federal National Mortgage Association on new housing design concepts. He had designed university buildings, shopping centers, high schools, elementary schools, churches, hospitals, apartment complexes, houses and office buildings.

He was a former chairman of the Fairfax County Architectural Review Board and of the Committee for the Annandale Master Plan.

He had been president of the Annandale Chamber of Commerce and the Annandale Kiwanis, a director of the Fairfax County Chamber of Commerce and he had served on the Board of Supervisors Committee to study the cost of housing in Fairfax County. He had been a director and chairman of the advisory board of the Fairfax Symphony.

Mr. Rio was born in Sortino, Sicily, and came to the United States at age 1. He grew up in the Bronx and graduated from New York University. He served in the Navy during World War II.

After the war, he settled in the Washington area. He was chief air base planner for the Department of the Air Force from 1947 to 1960. This included the establishment of site planning and site selection standards for Air Force bases.

In 1998, Mr. Rio moved from Annandale to Houston.

His wife of 56 years, Minnie M. Mowbray Rio, died in 1998.

Survivors include two children, S. Richard Rio of Annandale and Marlene R. Powers of Spring, Tex.; and two grandchildren.