I'll join you in the law suit. 

And the laws and regulations here are very different, not very strict like the states.Prices are high and rents are low over here.

Follow the law and send the exact required notices. 

As for offering subject-to financing, this is something that can be advertised under 'seller financing' in our local MLS, and there's investors that search specifically for listings with that marked, so that should introduce your property to a new set of buyers that may not have considered it before.

Purchase price: $65,000 Cash invested: $65,000 Purchased a 2 bedroom home with a separate 1 bedroom in law suite in the back yard.

Are there any Alabama laws that could protect existing investment properties from new restrictions?

(c) Do any of you have some specific market considerations I should take into account OR that I should be researching (high taxes, pertinent rent laws, etc.)?

The ones that had high rent growth, lax zoning laws, and general buzz about multi family gold mines.  

If HOA by laws state past due owners are responsible for all late fees and legal expenses for collection hire an attorney to go after the past due. 

With the recent tax law changes in capitol gains taxes in Canada and this property not being their primary residence.