The cost will largely be determined by the cost of data collection. A comprehensive rental registry for unincorporated Sonoma County was quoted at $5 per unit per year with a baseline estimate of 20,000 rental units to maintain (with startup costs as an additional cost–approximately $30,000 extra in Year 1). Costs decrease as the total unit count increases.

• Rental Registry:

• Campaign costs: $0-20,000 – These costs assume a political campaign for a full rental registry, created via City and County ordinance. Costs assume campaign materials and possible paid consultation.

• Registry: $100,00-200,00 annually (approximately $5-6 per unit per year for all units, not just inclusionary units) – estimate based on 2024 3Di quote to the County for 20,000 rental units. The City of Sonoma likely adds rental units but not more than 2,000-2,500 at most based on population size. A rental registry for the City alone would have a larger cost due to less advantage from economy of scale. Nevertheless, the cost would likely be less than $20 per unit per year based on 3Di’s services (which is one private vendor and does not include in-house creation of the registry).

• Monitoring / Enforcement:

• Enforcement Officer: $70,000-110,000 annually – The City of Sonoma has a single, part-time employee devoted to affordable housing monitoring and enforcement. Sonoma County has one employee for the entire unincorporated area (from Annapolis to Boyes Hot Springs). Therefore, this estimate is assuming the possibility of one, full-time employee who can monitor both the City of Sonoma and the broader Sonoma Valley. Both the City and County already have some expenditures for this purpose. The cost estimate assumes creating one full time position that can be shared by jurisdictions in Sonoma Valley. The salary estimate is based on comparable job listings on the County of Sonoma’s website.