X0202 4 2005-03-31 0 0000202947 CAPITAL PROPERTIES INC /RI/ CPI 0001323679 Eder Robert H 100 DEXTER ROAD EAST PROVIDENCE RI 02914 1 0 0 0 Class B Common Stock 2005-03-31 4 C 0 156972 0 D 0 D Class A Common Stock 2005-03-31 4 C 0 156972 0 A 1726710 I See Footnote As of the date of the conversion the reporting person beneficially owns 1,726,710 shares of the issuer's common stock of which 863,355 shares are held directly by the reporting person and 863,355 shares are held by the reporting person's spouse. This report is being filed voluntarily by the reporting person in connection with the automatic conversion of all of the issuer's Class B Common Stock on a one-for-one basis to shares of the issuer's Class A Common Stock which occurred pursuant to the terms of the Class B Common Stock on March 31, 2005. This conversion did not result in any change to the percentage ownership interest of the reporting person. Margaret D. Farrell (Attorney-in-fact for Robert H. Eder) 2005-04-13