Beware of new rules in California!
Client of mine was executrix for a relative who lived in CA. Got the estate settled, sold the property, had all the payoff amounts from mortgage, final tax from town/county, estate closure letter. Distributed proceeds to heirs.
Almost two years later, county came back saying they had adjusted the RE tax, here's a bill for well over $10k, pay up. Attorney in CA said she'd never seen such a thing in 30+ years, but researched it and it was legit.
Very luckily for the executrix, most of the heirs gave her money towards that bill, but she was still out of her pocket for about a third of it.
Doesn't specifically deal with your sale-of-home issue, but the executor should at least be warned of this possibility.