Los Angeles:
Los Angeles County property owners affected by the COVID-19 virus may have late penalties canceled if they are incapable of paying their property taxes by the April 10 deadline. LA County has no authority to extend the April 10 deadline, however, beginning on April 11, the day after property taxes are due, people unable to pay on time for reasons related to COVID-19 may submit a request for penalty cancellation online. The district has set up a special team to process these requests for those who demonstrate they were affected by the outbreak.
San Diego:
State law governs when property taxes are due and payable, so the second portion of property taxes is still due no later than April 10, 2020. For those who are directly impacted by the Covid 19 and are unable to pay on time, they can file a penalty cancellation request. All such requests will be reviewed on a case-by-case basis after April 10. This will require documentation of how the taxpayer was impacted by the virus that interfered with their ability to deliver the payment by April 10 (e.g. hospitalization).
https://www.sdttc.com/content/ttc/en/about-us/news/2020-coronavirus-response.html