David Loewenstein Sr., 70, founder and chairman of the board of the Wilson's Men's Store chain and an organizer of the Central Charge Service, died Thursday at Georgetown University Hospital after a heart attack.

Mr. Loewenstein established his first store in 1946 at 9th Street and Pennsylvania Avenue NW in Washington. The company subsequently grew to include 16 stores in the greater Washington area and the suburbs of Baltimore and in Charlotte, N.C.

In 1952, Mr. Loewenstein was one of a group of 20 leading Washington area businessmen who organized the Central Charge Service in order to unify credit account operations at area stores.

He was born in New York City and reared in Norfolk. He attended the University of Illinois.

He was born in New York City and reared in Norfolk. He attended the University of Illinois.

A Washington resident since the 1930s, Mr. Loewenstein was active in the Washington Hebrew Congregation. He was a member of the Woodmont Country Club in Rockville.

Survivors include his wife, Helen Louise, of Washington; a daughter, Louise Allentuck, and a son, David Jr., both of Potomac, and seven grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to a charity of one's choice.