Services for Mr. Bloom, who was 80 and lived on St. Paul Street, were being held today at the Levinson funeral establishment, 6010 Reisterstown Road.
He opened Cy Bloom's Place in the Alley in 1965, with an entrance from Wilkes Lane, the alley between Baltimore and Fayette streets. Later, he opened the Brass Rail in the same building with an entrance on Baltimore Street.
He closed both restaurants in 1980, blaming a loss of business on subway construction.
Among his many customers were former Oriole manager Earl Weaver, comedian Art Carney and talk show host Johnny Carson.
Celebrities were part of his life since he operated the Club Charles in the 1940s and booked a newcomer comedian named Jerry Lewis and befriended George Jessel.
Mr. Bloom owned other clubs, the Blue Mirror on Charles Street, the Celebrity Lounge on North Avenue and the Coronet Lounge at St. Paul and Centre streets.
As a young man, he was a nightclub entertainer, performing for a short time in Washington.
His act included an imitation of the singer Ted Lewis, which he often did for fun in later years.
Born in New York City, he came to Baltimore as a child and was a bat boy for the International League Orioles.
He was a member of the Saints and Sinners, the Variety Club and the Independent Order of Odd Fellows.
Mr. Bloom is survived by his wife, the former Margaret Tkac; a daughter, Claire Rosen Gelb of Tucson, Ariz.; a sister, Beatrice Reichman of Lutherville; a brother, Norman Bloom of Pikesville; four granddaughters; and two great-grandchildren.