Federal and local government officials, Jewish and Christian clergy, and Adas Israel officers gathered at the Sixth & I site on November 22, 1906, to lay the cornerstone of the new synagogue. Artifacts and mementos were placed inside the stone. According to press accounts, the stone, which has since been extracted, contained:
§ Copies of local and American-Jewish newspapers
§ A copy of the Constitution of the United States
§ Adas Israel's constitution and a list of its officers and members
§ Coins from the year 1906
§ The yearbook of the Council of Jewish Women
§ A copy of the Evening Star of September 10, 1898, which contained an article on the dedication of Washington Hebrew Congregation’s Eighth Street synagogue
§ A copy of the April 15, 1865, New York Herald, which contained accounts of the assassination of President Abraham Lincoln and the fall of Richmond.