David J. Rietz, 69, of West Chester, an architect, died of complications from pneumonia Saturday at Crozer-Chester Medical Center.

Since 1991, Mr. Rietz had been a partner with Hugh McCauley in United Architects in Bryn Mawr. The men designed medical facilities including buildings at Chester County Hospital, and commercial and residential buildings. In Cape May, they restored a train station and historic homes and hotels, and reconstructed the Coast Guard Training Center.

A native of Steubenville, Ohio, Mr. Rietz earned a bachelor's degree in architecture from Cornell University. He then served in the Army in the States.

Before forming United Architects, he worked for his architect father, John J. Rietz, in Steubenville and had a solo practice in Philadelphia. He first collaborated with McCauley on a public housing project in Coatesville in 1968. He had acute capability in engineering and architecture, McCauley said, and could design air-conditioning and plumbing systems.

Mr. Rietz was a Mason and a Shriner. He was a member of Westminster Presbyterian Church in West Chester and was active in its Stephen Ministry, which assists the ill, lonely, and others in need of support.

He enjoyed his vacation home in Chautauqua, N.Y., sailing on the Chesapeake, and travel.

Mr. Rietz is survived by his wife of 16 years, Cynthia Vawryk Rietz; sons David, John and Andrew; a daughter, Stefanie Hutchinson; a brother; a sister; five grandchildren; and his former wife, Maryanne Dalton.

A celebration of his life will be at 1 p.m. today at Westminster Presbyterian Church, 10 W. Pleasant Grove, West Chester.