Thomas J. Offutt, 75, a builder and developer who founded the Dittmar Co. of Vienna and had interests in apartment projects and the Westpark Hotels, died of cancer Feb. 20 at the home of a son in Arlington.

Mr. Offutt, himself a resident of Arlington, was born in Greenville, Miss. He grew up in the Rockville and Poolesville areas of Montgomery County and graduated from St. John's College High School in Washington. He attended Georgetown University. During World War II, he served in the Army Air Forces.

Mr. Offutt began his business career in a family mortgage brokerage. After the war, he joined his father and other family members in a construction business. He soon formed another partnership and he started the Dittmar Co. in 1954. He remained president until his death.

The Dittmar Co. built numerous office and residential projects and also owned and operated about 1,800 apartment units. Mr. Offutt was the builder and a partner in the Westpark Hotels, which are located in Rosslyn, Tysons Corner, Leesburg, Va., and Williamsburg.

He was a past president of the Northern Virginia Apartment Association and a member of the Arlington Optimists Club, the Washington Golf and Country Club and the Best Western Hotel Association.

His marriage to the former Calla Prescott ended in divorce.

Survivors include his wife, Evelyn S. Offutt of Arlington; two children by his first marriage, Anne Urquhart and Thomas J. Offutt Jr., both of Arlington; two children by his second marriage, Mary Offutt of Sargentville, Maine, and Anthony J. Offutt of Arlington; a stepdaughter, Chantal Paradiso of Annapolis; a brother, William E. Offutt Jr. of Arlington; a sister, Ann Hamilton of Bel Alton, Md.; 14 grandchildren, and two great-grandchildren.