If you're like me, and you can just read the material, study on your own, and take a test on it, then I think preschools is the way to go.

Or get a test (might be cost involved) and estimate from a remediation company and provide as a reference for your buyers.

I passed the tests last year, but finally decided to get serious about it this month.

They cared a great deal that there was a leak behind the shower wall and they cared a great deal that the radon test came back really high. 

I am not aware of a court ruling on this particular Code provision, but if I were a landlord I would not risk being on the wrong side of a “test case” where someone is injured badly.So, in the example above with an owner occupied two family with one common entrance and driveway, that lease provision would be illegal.Even if the tenant is responsible for snow removal under a legal lease provision, the landlord could still face personal injury liability for slip and falls on snow and ice under the SJC ruling.

My professional background is in technology test and evaluation.

I'm going to try a test tonight -- cover the sink drain and run the water to see if the water smells without it going down the drain. 

They test the limit switches, clean the burners and check the heat exchanger for cracks.  

You might as well start with rent to own because it's less management intensive (since you have no maintenance & repairs calls), you get better quality tenants (since they put down $5K or more and hence, have more to lose if they decide not to pay the rent), and you accumulate that $5K reserve that you can use in case of vacancies.3.

So depending on what are your plans/goal make sure to include other factors in your analysis when getting your new rental and not just cash flow numbers.I would go with ELOC as @Damien Hall said and test your new area first, and if you are doing well and making more money , then dump DC property, but until then I would keep it and enjoy easy appreciation in your DC house.Hope that helps.