Marin is seeking public comment as it crafts new rules intended to balance the need for affordable long-term housing and the desire of homeowners to rent their homes to vacationers. The Marin Community Development Agency will present an updated short-term housing ordinance to the Board of Supervisors by the end of the year. If approved, the rules would replace the moratorium on new short-term rentals imposed a year ago. The C.D.A. has received 1,800 responses…