How do you accurately calculate holding costs? 

To the best of my knowledge you won't get any of your social security benefits reduced since the rental income will not be included in the retirement earnings test but with a rental income that high, 85% of your social security benefits will be taxable so your social security will be reduced but not due to the retirement earnings test but instead due to crossing the "Combined Income" threshold.

Prob. not the best idea to test your theory as it can be a very expensive lesson. 

Was wondering how others recommend getting an accurate ARV to go off of in similar situations.

( radon testing?

This time I went in person with an oven thermometer to test it for myself and also to make it not so easy for him.

No sense in leaving money on the table, you will find renters as long as your numbers are accurate. 

In my experience it is better to follow taking the test after a period of study with no distractions in between.

Just look at the latest news about the Teddy Roosevelt... 60% of the crew tested positive for antibodies and the vast majority were asymptomatic.

Originally posted by @Matt Ziegler:Finding a realtor who is also investor and understands your long-term goals is very important. 100% accurate right there!