I was looking how you may find it on Trulia. The suggestion that I would make is to look at the taxes that were paid last year and see what percentage that is of the price. For instance, if a house has a tax value of $500k and they paid taxes of $7,500 Then the tax rate is 1.5%. Typical starting rate of taxes is just below 1.1%. Mello roos are bonds for schools, streetlights, fire departments, etc. Since they are bonds they eventually get paid off. But, since they are bonds they also are not a percentage of assessed value, but a fixed amount. If your bonds equal $2500 per year then if the house price dropped to $400k in the scenario above then the effective tax rate would change to closer to 2%. If you scroll down to the property tax column on Trulia you can see what i am saying.