If the property you are talking about is in Altadena and NOT within the city of Los Angeles, you are in luck. Altadena is an unincorporated part of Los Angeles county and does not have rent control. Other nearby areas including Pasadena and South Pasadena do not have rent control either. If the property is not in a rent controlled area, you don't have to worry about paying relocation fees to the tenant. However, you DO need to honor the terms of the tenant's lease. Hopefully, you wil be able to come to a mutual decision to terminate the lease if your objective is to tear down the buidling. Best of luck with this!