talk to the dept of health first (records requirements etc), establish what upgrades/maintenance required, line up a reliable repair/handyman/type person, consult lawyer, and then make your offer, see if you can buy the land it's on via lot line adjustment (ideal scenario). a lot to be aware of, such as system upgrades or county code changes bringing in the requirement to add metered connections to an older small system, for just one example.Otherwise- owner doesn't want to manage, I doubt you really do either but could be wrong. 

I do know that HUD posts rates and the local housing authority can pay between 90-110% of that payment standard for the particular zip code the property is in.

Montgomery and Anne Arundel refer to them in code as ADU.

As you write checks and make deposits your income tax return is preparing itself.At the end of the tax year print a simple Profit and Loss report for the time period and hand it to your bookkeeper or CPAYou still need to keep receipts for seven years or so but the works does itself as you write and code each check.Even if you file as an LLC, Partnership or corporation your CPA will thank you.

The codes can definitely be a bit confusing. 1st and foremost it's important to ensure you are using the correct code!

Advise that the property has never been tagged by law or code enforcement as a drug production property and that their concerns are unfounded. 

Look for for rent ads in your zip code.

Might be a good idea to check the building codes in your area and see if this is an item that has been set down in law.

These are professionals with additional training and a stricter code of ethics.

It is a little more complicated than recommending zip codes to invest in since Detroit is a very block by block marketplace.