Rancho Cucamonga allows short‑term rentals only in the host’s primary residence; tenants may operate STRs with written authorization from the owner and must obtain a business license, TOT registration certificate and STR permithttps://www.cityofrc.us/everything-we-do/short-term-rental. Hosts must include their permit number, maximum occupancy and street‑view photo in all advertisements and are limited to two concurrent bookings; unhosted rentals are limited to 90 days per year and occupancy including host and guests cannot exceed two times the number of bedroomshttps://ecode360.com/43287220#:~:text=valid%20permit%20as%20issued%20by,set%20forth%20in%20subsection%20Ehttps://ecode360.com/43287220#:~:text=Hosting%20platforms%20shall%20be%20responsible,40%20of%20this%20code. Accessory dwelling units under covenants restricting rentals cannot be used for STRs, and hosts must prevent nuisanceshttps://ecode360.com/43287220#:~:text=Hosting%20platforms%20shall%20be%20responsible,40%20of%20this%20code. The city imposes a transient occupancy tax of 12 % on rent charged to transients; operators must collect the tax, state it separately from rent and may not absorb ithttps://ecode360.com/43284044#:~:text=For%20the%20privilege%20of%20occupancy,that%20such%20tax%20shall%20behttps://ecode360.com/43284044#:~:text=Each%20operator%20shall%20collect%20the,in%20the%20manner%20hereinafter%20provided.