MZF Managed Duration Investment Grade Municipal Fund (delisted)

Division of Investment Management

U.S. Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

Dear Sir or Madam:

Pursuant to Rule 497(j), I hereby certify that no changes have been made to the forms of prospectus and statement of additional information since the electronic filing on February 28, 2014 of Registrant's Post-Effective Amendment No. 109 under the Securities Act of 1933 and Amendment No. 48 under the Investment Company Act of 1940.

Sincerely,

/s/ Patrick F. Quan

Patrick F. Quan