You should be doing a full home inspection to include radon testing and termite check, a sewer (or septic or well) inspection, and if applicable, an oil tank sweep.

Have you tried to sell a few just to test the market?

Can't tell when in the future all of these data points (low interest rates, housing shortage, Builder shortage, Lot shortage, migrating investors, migration from city to country, family RE knowledge) will come together.The process of subdividing created value from $6,000 farm ground per acre to $50,000 per acre for the 2 acre lots. 

The property data can be obtained through you local assessor's office. 

Companies like listsource.com (there are less expensive options) specialize in providing that data if I’m not mistaken.

So, the rate will be probably ~1.25% higher.Don't forget that there is another requirement about being able to carry the mortgage as if the other units weren't rented -- forgot the formal name for this "test." 

You can test for it yourself with a kit and paint right over it no problem.

I love looking at hard data and statistics.

Today (5/17), the National Association of Home Builders releases its NAHB/Wells Fargo “Housing Market Index” for May, followed by the Census Bureau’s new residential construction data (including “Housing Starts”) for May on Tuesday (5/18).

In general, to qualify for the Section 121 exclusion, you must meet both the ownership test and the use test.