I'm guessing they might eventually want all the ADA requirements. 

But if either 1) the line is very shallow, only a few feet deep and thus not a lot of digging is required, 2) the line is very long, like over 100 feet, and so it actually is substantially more expensive to replace the whole thing or 3) if the break is under dirt but the line goes under the driveway or a large amount of concrete.

I'm aware of both the ADA laws regarding service animals and FHA for emotional support animals.

Plus, keep an eye on emerging markets like Greenville and Columbia in South Carolina—they’re seeing more development and interest.I can get you more information on specific areas once you have a more concrete idea of where you want to invest.Let me know if you want to connect and I'll be happy to help. 

If the seller is still on the property after you close (you negotiated delayed possession), I wouldn't be opposed to doing exterior work (roof, landscaping, concrete, etc.), but I wouldn't do any interior work.

It may have been a few years since I have but I can read codes and stay compliant.

If I were you, I would connect with a local market expert who can give you concrete data on your market and what the future holds.

The book comes with worksheets and concrete strategies, and if you're on the road is available as an audio book too.

Multi-treatment where necessary on the concrete slab, as well as in the master bathroom, which was a bird catch.

@Tosin Oluwatoye a good way to test out your location is to put the concrete pads down, add a 30/50 amp outlet and water line, and then rent out the pads to people who already own their own tiny houses.