How to use the Rental Calculator

[Doug Haisten]

I am using the Rental Calculator (in Bigger Pockets) for a several unit purchase (SFR). The owner's price is what the county has set for the properties on the Tax Assessors. How do I determine the value of these houses? By Comps or by putting in successive prices for the properties until the analysis s give me the monthly cash flow and Cash On Cash Return I want OR have a RE Assessor do a drive by assessment? The houses are well maintained and fully rented in nice neighborhoods.

Thanks