@Jessica Flint Google search airdna.co rentalizer tool.

But plenty of Big Ag is out there, automotive, heavy truck, tooling, their is a pet food plant if I remember, and perhaps an ethanol refinery as well....again if my memory serves me.    

This is uncharted territory for me, and yet an invaluable experience.

If there is a difference in value, whoever brings the lesser value property to the table pays a "boot" to make up that difference. 

If the investor had to sell right away for $240k, with closing costs and commissions, they would most likely lose money.The other key point is without any improvements, the new appraisal will be $205k, the price you sold it to an investor for, not the $240 comps in the area.Wholesaling works best if you can find an off market fixer and the rehab the investor puts in forces a significant improvement in value.

There are so many tools available that it is pretty easy.

@Mallikarjun Reddy Pateel using the T12 and current rents are great tools to base off your offer.

But, when you purchase a 4-unit property, or something larger the property is not considered to be sort of a commercial property and I like to think of a 4-unit property the same as a business like a liquor store where the higher the sales the more the liquor store will sell for.Four units or more will appreciate in value sort of exponentially when you increase rents and a single family property will not.

@Mark ReyesYeah I use PropStream for that, pretty helpful tool in a couple ways at least

Hamilton County has a tool to calculate this but a quick tool is using a ratio between current assessment and new assessment (Current Taxes/New Taxes = Current Value of Property/New Value of Property)