Robert E. Langdon Jr., 86, who with his partner, Ernest C. Wilson Jr., designed the J. Paul Getty Museum in Malibu, Calif., died Aug. 13 in Pasadena, Calif. No cause of death was reported.

The architectural firm of Langdon & Wilson helped shape commercial construction in Los Angeles and Orange counties throughout the second half of the 20th century. It also designed corporate and industrial complexes, resorts, schools, museums and health care facilities in 12 states and Mexico.

Mr. Langdon and close friend and business partner Wilson, who died in 1992, met as students at the University of Southern California architecture school.

Mr. Langdon, a native of Council Bluffs, Iowa, worked on campus expansion projects after World War II, while Navy veteran Wilson completed his degree. Both observed the postwar building boom in Los Angeles.

They joined forces in 1949, operating their fledgling business from a single drafting table in Mr. Langdon's home, and they officially became the Langdon & Wilson architectural firm in 1951.

Today, the firm is known as Langdon Wilson Architects.

Mr. Langdon headed the Los Angeles office, supervising design and construction of 27 major office buildings along Wilshire Boulevard alone, and such major complexes as the 2 million-square-foot Hughes Aircraft-Electro Optical Systems plant in El Segundo.

Mr. Langdon worked closely with oil billionaire Getty, who lived in London, on designing the first of two Southern California museums bearing the late art connoisseur's name.

The original Getty Museum, according to Getty's wishes and Mr. Langdon's efforts, mimics the Villa de Papyri in Herculaneum, a southern Italian seaside community destroyed along with Pompeii by the eruption of Mount Vesuvius in A.D. 79.

The museum is closed for renovation but eventually will house Getty's collection of Greek and Roman antiquities. The remainder of his art is displayed in the far larger Getty Center designed by Richard Meier.

Survivors include his wife of 58 years, Jacqueline Hughes Langdon; two children; and three grandchildren.

Robert E. Langdon Jr. helped shape the look of Los Angeles.At the client's request, Robert E. Langdon Jr.'s design for the Getty Museum drew from an ancient Italian villa.