Samuel Lenkin, 79, a retired real estate developer and apartment manager who was active in Jewish Organizations, died Friday at the Bethesda Retirement and Nursing Center. He had arteriosclerosis.

Born in Dolhinov, Russia, Mr. Lenkin came to this area in 1913 with his mother, three brothers and a sister to join his father, who had settled in Washington.

He worked in the family's Capitol Hill gorcery business until 1940 and then on his own until 1946, when he established Lenkin Homes Inc., a real estate development firm.

Mr. Lenkin developed private homes and apartments in Montgomery County until about 1964, when he began managing apartment buildings in Takoma Park. His wife, the former Fannie R. Luchs, helped him operate his business and took over as manager of the Carrol Gardens Apartment in Takoma Park when Mr. Lenkin retired in 1972.

A former Silver Spring resident, Mr. Lenkin had lived in the Bethesda Retirement Center for about five years. He was a graduate of the Emerson Institute and attended George Washington University.

He was a member of Ohev Sholom Congregation in Washington, a former gabbai and member of the board of directors of Beth Sholom in Washington and a member of B'nai Israel Congregation in Rockville.

Mr. Lenkin was a 32nd degree Mason and a member of the King Solomon Lodge in Washington for more than 50 years.

Besides his wife, of Silver Spring, survivors include two sons, Dr. Myron L., and Ronald L., both of Rockville; a daughter, Rita L. Becker of Baltimore; a sister, Ann Neuger of Cleveland and 10 grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Hadassah of Greater Washington or to a charity of one's choice.