While the forums here may be helpful, those forums are private and specifically for LPs of any syndication deal, that niche group may have more expertise for you in this situation. 

Dig into reverse mortgages before pulling the trigger on anything, specifically HECM's (FHA product).

Did you have any specific area in mind? 

Those effected go well beyond the property owners, the economic contribution of RE and subsequent economic loss in the form of: management, maintenance, landscaping, caretaking, hospitality, tourism, contracting, designing, pools and gardening is economically catastrophic and will reverberate well beyond specific zip codes.

They are a new international lender in Costa Rica offering 30 year, fixed rate mortgage loans specifically for American investors.

lots to learn here just browse around and you'll pick up on stuff and know where to hone in more im specific areas you are interested in. 

In that case, you’d typically need to file a legal challenge, which could involve going to court and showing that the restriction is unnecessary or unreasonable.The best advice I can give would be to consult a real estate attorney to understand your specific situation and options.

Income will depend on your plan for the specific asset. # of units doesn't necessarily equate to how much income you could make.

The problem is no one book is going to be detailed enough for your specific state and county.Right here on BP there are lots of discussions about tax liens.

Let me know if you need help with specific tools or anything else.