Leila Monroe, a Bolinas attorney, entrepreneur and affordable housing advocate, will replace Chris Desser as West Marin’s representative on the Marin County Planning Commission.

On Tuesday, the Board of Supervisors appointed Ms. Monroe, along with two incumbents, Margot Biehle and Rebecca Lind. They extended the application deadline for two at-large seats through March 31.

Ms. Monroe was active in West Marin’s emotional debate over short-term rental regulations last year, advocating for limits to help ease…