0000202947 2023-12-20 2023-12-20 NONE false 0000202947 RI 8-K 2023-12-20 CAPITAL PROPERTIES, INC. RI 001-08499 05-0386287 5 Steeple Street Unit 303 Providence 02903 401 435-7171 false false false false Class A Common Stock, $.01 par value CPTP false