I will offer fair market value of your home based on homes sold in your area with the same bedrooms, bathrooms , and square footage.

Freddie Mac allows you up to 6 mortgages with an 80% refinance based on appraisal(new rule just changed this week), so in markets like Memphis where the acquisition cost is low she can actually use a turnkey provider as Charles Moore was suggesting, acquire a home below market value(using a private lender) which is renovated and rented, and then refinance it which would create a very low out of pocket cost situation for her.Depending on how serious she is about doing it, or how committed she is to reducing her tax liability, she could(given her age, I am assuming she is retired) structure her real estate business where she could qualify as a 'real estate professional', and this would allow her to depreciate things like her 'home office', which is a specific amount of square footage on her primary, as well as take the mortgage interest write offs on loans plus depreciation, and other goodies like meals(when applicable), maintenance, and so on. 

Most of the time the GCs would ask me whether this home was a flip or my personal home which I took as a good sign.You could try asking questions related to per square footage costs or material sourcing questions to let them know you were serious. 

It can mean below market for a house or my particular house if someone were to fix it up, add some square footage etc. 

I looked at the comps, and this is what I found on the MLS (Criteria: Sold within 90 days, within 10% of square footage, within 1 mile of seller's house, and 1 story houses just like the seller's house):Sold Price        Sqft living      Bedrooms   Baths159,000              987                 2                 1243,000             1003                2                 1166,750             1028                2                 1289,000             1035                2                 1 185,000             1072                2                 1 175,000             1103                2                 1158,000             1120                2                 1 132,000             1120                3                 295,000               1143                3                 1 214,000             1147                2                 2207,000             1162                2                 2169,000             1179                3                 2185,000             1179                3                 2Another house sold for 365,000 within the last 90 days and has a total sqft of 1765; the seller's house has a total square footage of 1700 and living sqft is 1080.

Also some renos add square footage and amenities.

Converting the home from 2 bedroom to a 3 bedroom and increasing the square footage from 1,100 to 1,900 made all the difference in the world.  

Let's say you have a spreadsheet with 300 home on it.Is there a place one can upload a, say a CSV file, and it returns the estimated home values, and maybe other attributes like square footage, for each listed address?

What's the square footage?

For those that are not buying, you are competing with all those brand new apartment complexes with saltwater pools and fitness centers who are renting similar square footage at similar prices.