this one was purchased for 1.47 million in 2005, the current owner is paying $22,700 in property tax yearly as well as $500 in HOA monthly. that gets to around $2400/month prior to her mortgage.
I think $850k would be reasonable for the house itself. but because mello roos is at 6800/year, that purchase price would only bring the total property tax down to $15000, which would still be roughly $1300 in taxes monthly, adding the $500 in HOA, still at $1800/month prior to mortgage.
and remember the $500 in HOA is not tax deductible.