It is able to calculate based on square footage, number of beds/baths, crime scores, and other hard data.

Renovation, updating with LVP throughout, increased bathroom square footage, all new bathroom, improved the "flow" of the floor plan by creating an "open concept", added washer/dryer hookup, general upgrades, finer finishes.

@Amir B. here is one close by that’s the same square footage and condition:https://www.zillow.com/homedet...it looks like they have had tons of contacts, but also had to lower the price a couple times.

Total square footage?

Comparable sales are same square footage, nearby neighborhood, sold with a loan in past three months.

.: )  If its a bonus room then the square footage should already be considered into the value of the home.

1301 Whittenburg Fort Worth, TX 76134 Purchase Price $118,900.00 Number of Bedrooms 3 Number of Bathrooms 2 Car Storage 2 Car Garage Estimated Rent Range $1095-$1195 Rent Amount for Expense Calculations $1,195.00 Estimated Annual Property Taxes $1,289.00 Estimated Annual Homeowners Insurance $742.36 Estimated Annual HOA Dues $0.00 Estimated Annual Vacancy Expense (5%) $717.00 Estimated Annual Maintenance Expense (5%) $717.00 Estimated Annual Management Fee (10% and Lease Fee) $1,832.33 Year Built 1978 Square Footage 1,848 Price Per Square Foot $64.34

If your walking the street or looking at video or google earth footage of said street it's pretty hard to miss a new house vs a 100 year old one....Furthermore you can check the comps.

My duplex even looks like a single-family home, so this was not an apples to apples comparison. 2nd, they incorrectly downgraded the condition and quality of my freshly rehabbed property to match that of the older duplexes that had not been rehabbed in decades. 3rd, square footages were inaccurate by greater than something like 20%.

House square footage(1800), 1 Tennat(living upstairs)(600 sf)(Rent:700)Downstairs(No tennats)(1200 sf)I assumed around $254 per month for utilities for the whole house(Akron, OH)