Yesterday we received an email tip from Kevin Walter, asking: “Did anyone notice that Zelig Blumenthal’s store at 13 Essex Street has vanished without a trace? Signs are gone? Interior is completely empty. Another bit of the old, Jewish Lower East Side gone.” Today we dialed the phone number for the Judaica store, a fixture on the Lower East Side for close to 60 years. The man who answered said they’d moved to Brooklyn.