It is important that your taxes are filed correctly and on time. Here's how to make filing your estate and trust tax returns easier.The State Controller's Office, Tax Administration Section, administers the Estate Tax, Inheritance Tax, and Gift Tax programs for the State of California. The Tax office is located in the municipal building located at 237 S. Pavilion Avenue. Our mailing address is PO Box 188 Riverside, NJ 08075. Since there is no longer a federal credit for state estate taxes on the federal estate tax return, there is no longer basis for the California estate tax. You'll be glad you did. Name. Regular Property Tax Bills Information and the link to the Riverside County Treasurer-Tax Collector's office. Looking for information on the California property tax rate? Learn who needs to pay as well as how and when they pay real property taxes in California.