Leonard J. (Scotty) Valeo, 64, a retired construction superintendent with Levitt & Sons Inc., and a co-founder of a child day-care center in Bowie, died at his home in Crofton Thursday after a heart attack.

Mr. Valeo was born in Roslyn, N.Y., and was in the Civilian Conservation Corps during the 1930s. During World War II, he served in the Army Corps of Engineers in the Pacific. When he left the service, he went to work for the Trimslide Co., a construction firm, and helped build the first Levittown, which was on Long Island, N.Y.

Later, Mr. Valeo joined Levitt & Sons Inc. and helped build "Levittowns" in Pennsylvania and New Jersey. In 1963, he was transferred to the Washington area and settled in Crofton. He helped build Levitt communities in Crofton and Bowie was a construction superintendent when he retired in 1974.

In 1965, Mr. Valeo was cofounder of the Tom Thumb Nursery, a private child day-care center. He continued to help operate the facility until his death.

Mr. Valeo's survivors include his wife, Rita, of Crofton; a daughter, Patricia Merkel of Draco, Pa.; two sons, Leonard J. Jr. and Anthony M., both of Bowie; three brothers and three grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Our Lady of the Fields Catholic Church, 1069 Cecil Ave., Millersville, Md.