County planning staff are set to pitch an amendment clarifying county development code language that caps accessory-unit rooms at three per house and prohibits short-term rentals of those rooms, following up on a trio of workshops on affordable housing held last fall by the Board of Supervisors. “We want to make it very clear that the expectation is…you cannot make that room available for short-term rentals,” said Tom Lai, the assistant director of the county’s Community Development Agency. Staff will make their recommendations to the Marin County Planning Commission at a public hearing and workshop on Monday, July 11, along with ideas for a number of other possible tweaks to development code, including tightening construction safety standards, lifting a ban on slaughterhouses and updating sign regulations in the wake of a 2015 Supreme Court ruling that said governments could not impose restrictions on signs based on their content. The possible changes would only apply to unincorporated parts of the county not in the coastal zone—in West Marin, that includes Nicasio and the San Geronimo Valley. The staff’s report on the amendment notes that further code changes may be needed to conform with potential changes brought by a state bill on junior accessory units currently passing through Senate committees. That bill—Assembly Bill 2406—would reduce costs and lighten requirements for junior units, and require owner-occupancy while a junior unit is rented. Mr. Lai said the code tweaks missed the current round of county-proposed changes to the Local Coastal Program, which the California Coastal Commission is close to approving. He said staff could “always come back later to submit a separate amendment for the coastal zone.”