I am currently available for appraisal work, see appraiser services
Typically when a person passes away you will need a valuation as of the date of death, you can use a date six months prior and six months after, which ever is to your best advantage. When you need both dates the second valuation is half off.
Under prop 13, if the market declines you have the right to lower your assessor taxes to the current value, you can even retroactively reduce your taxes for more than just one year. I have performed these reductions in cases and provided expert witness testimony. The largest overall value reduction I have performed was lowered by 9 million dollars, which saved the owner over $400,000.