@Claudia RottenbergerChances are the property is worth nowhere near $270k, it probably has some deficiency that makes comparison with seemingly comparable properties invalid.It would be e trembly rare for a $270k real market value property, even needing $15k rehab, to sell for $189k.

It may depend on what you pay for rent in comparison to what it cost to own.

And there is only one piece of credible data within the sales comparison approach, the actual sale prices of the comparable properties.The problem your appraiser has, and now you have, is a lack of data.

The probable extension of the orange line towards Centreville is making that area quite attractive (still cheap in comparison to Vienna or Alexandria) 

For further comparison purposes - even LIHTC affordable, 2000 vintage deals with 60% AMI restricted rents that don't burn off until 2050 in Vancouver/Portland are trading to 6.00% caps... 

Maybe 50 feet from the house.Once I did a comparison of all the properties that you could rent, I came up with our nightly rate.

In comparison to an employee, who exchanges 40 hours per week for a salary, if you exchange 3 hours per week to oversee or operate your properties, then you are more passive than active.

Then where am I gonna be in comparison at 6 years or long term 20 -30 years..

Speaking in relative terms, house hacking is extremely in comparison. 

I decided to redo some of the comps and kept the search more around a range rather than an exact comparison.