Herbert J. Korzendorer, 75, president of Korzendorfer Realty Inc. in Bethesda since 1933, when he established the business, died of cardiac arrest Monday at Suburban Hospital. He lived in Bethesda.

When he first started the company, Mr. Korzendorfer worked in remodeling. Later, he became a registered architect. He designed and built hundreds of homes as well as some apartment and office buildings in the Washington area, most of them in Montgomery County.

He had been a real estate broker since 1946 and in recent years had worked in commericial sales. He was a member of the Montgomery County Board of Realtors and had served three terms on its board of directors.

Mr. Korzendorfer was born near Centreville, Va. He served in Europe during World War II with the Army, first with an engineer unit building roads, bridges and hospitals. He was involved in the building of floating harbors used in the D-Day invasion of Normandy. Later, he transferred to the infantry and participated in the Battle of the Bulge. He was discharged with the rank of major.

Survivors include his wife, Barbara, of Bethesda; a daughter, Rita Marth of Takoma Park; two brothers, Roy and Charles, and two sisters, Julia Richey and Helen Poland, all of Northern Virginia; another sister, Mary Wilson, of Florida, and one grandchild.