Altadena is an unincorporated community subject to Los Angeles County’s Short‑Term Rentals Ordinance adopted in April 2024. Under the ordinance, short‑term rentals must be registered with the County Treasurer and Tax Collector, are limited to a host’s primary residence, and may not be conducted in accessory dwelling units or non‑habitable or temporary structuresfile.lacounty.gov/SDSInter/bos/supdocs/195175.pdf#:~:text=A%20STR%20is%20a%20primary,for%20STR%2C%20and%20any%20other. Registered STRs must display their registration number, renew annually, and comply with limits on the number of rental days when the host is not present and on the number of guestsfile.lacounty.gov/SDSInter/bos/supdocs/195175.pdf#:~:text=A%20STR%20is%20a%20primary,for%20STR%2C%20and%20any%20other. Unincorporated communities must also register for a business license and collect a 12 % transient occupancy tax (TOT) on stays of 30 days or fewerhttps://www.bnbcalc.com/blog/short-term-rental-regulation/Los-Angeles-County-California-Guide#:~:text=annually%20with%20the%20L,Treasurer%20and%20Tax%20Collector. Source: https://file.lacounty.gov/SDSInter/bos/supdocs/195175.pdf