Lerner was raised in an Orthodox Jewish family in Northwest Washington D.C., the eldest of three children born to Mayer, a 1921 emigrant from Palestine, and Ethel, who emigrated from Lithuania. He attended Raymond Elementary School, McFarland Junior High, and graduated from Roosevelt High School in 1944. He then served with the U.S. Army as a typist during the latter part of World War II. He then went on to attend George Washington University via the G.I. Bill where he received first an Associate of Arts and then in 1949, he graduated with a L.L.B. from The George Washington University Law School. While in law school, he sold homes on the weekends which piqued his interest in real estate.