{geni:about_me} Leopold's brother Marc Eidlitz was the founder of a major construction firm, Marc Eidlitz & Son Builders N.Y.C. in New York, which built the St. Regis Hotel and many other projects. Marc converted to Catholicism and kept close ties to the German immigrant community, becoming president of Germania Bank in 1888.

Eidlitz made his home at 123 East 72nd Street, where he died. He had four sons and a daughter.