The seller has the two lots legally separated, but due to deed restriction imposed by the subdivision development, found that building a house on the “tennis court” lot was not allowable. 

None of us can give you legal advice!

To avoid reducing your lifetime exemption, you could gift equity incrementally, but this requires proper legal structuring (e.g., fractional ownership transfers).

But I’d’ also ask if the girlfriend is a legal US citizen?

You can't legally deny a true service animal.

I am wondering if anyone has ever taken legal action against property managers, and if they think we have a potential case? 

I am starting the legal process as we speak and depending how many more we can make this a class action law suit. 

You can also find various contracts online, develop your own then have an attorney review it to ensure it has teeth, and is legal in your area.7.

I think new builds don't really work from an ROI standpoint, but if you can find properties that have easy ADU conversions then the value might be there.I'm in MA and we just made ADUs legal by right, so I'm looking into the best ways to add value using them.

Hello Doug, I am not a real estate attorney nor is this legal advice.Unless someone's state has specific laws banning contract assignments you should be fine doing the following.