@Addam7 , unfortunately this is not an Airbnb issue but a tenant - landlord issue. You have a signed rental contract and your landlord is wanting to break the contract so that he can turn his rental property into a STR, correct? In the state of California, there are numerous laws put in place to protect tenants, some might say tenants have more rights than the landlord/property owners. You should have no difficulty finding a housing advocate organization that deal with landlord/tenant issues and have dealt with these issues. Reach out to one and familiarize yourself with your rights as a tenant.
Bottom line is figuring out if you want to stay in a place where the landlord wants you out or finding another place where you can live.
Best of luck!