Roy Westmore, who compiled an 88-20 record, two Interhigh League titles and one city championship in four years as the Dunbar High School boys basketball coach, said yesterday he is resigning to concentrate on his real estate business and spend more time with his family.

No replacement has been named.

Westmore took over the highly successful Northwest Washington program in September 1983 when Joe Dean Davidson left to coach at Delaware State.

Dunbar finished 23-4 this past season and won the league title and the city championship. Westmore's team also won the league his first season, but lost in the city championship game. He was named the area's coach of the year that season.

Westmore also coached the girls softball team, which last week stretched its winning streak to 30 games and won a second straight league tournament title.

"I've enjoyed my coaching career here but I think I should begin to devote more time to other important things," Westmore said. "I am selling real estate and I can give some of those basketball evenings to my family now. I've been coaching 20 years and it's time for someone else to step in, someone who is interested in taking his career beyond high school.

"I plan to remain in the system as a physical education teacher but I don't plan to coach anymore. It might even be best to transfer to another school because . . . I wouldn't want the new coach to feel he has to look over his shoulder. He can start free and clear."

Tyrone Gibson, an All-Metropolitan player at Dunbar the last two seasons, was sentenced to three years probation after pleading guilty to charges of cocaine distribution and simple assault last month. Westmore has said he had no knowledge during the past season of Gibson's two arrests last year.