.- In reverse direction, American oil company invested heavily in rubber, tea plantation, oil company in such country since ... 1920s- Mainland Chinese family came to Cupertino,CA in early 2000 to purchased house there.I meant to say, the US mainstream investor is just mainly "do not know" those international activities already happening in the last 20 30 years or so.

Lots of tree damage .

A bit of tree damage and cleanup as well. 

Not sure where this is or how old it is but it does not strike me as reason for major concern, most of the time if there are issues with the line it is from tree roots which happen whether the neighbor is there or not.

You don’t want a hotel opening up next to your house any more than the neighbors you are doing this to.Neither would it be very nice to open up a whore house, crack house, or your own shade tree car mechanic business with 8 cars scattered on the front lawn.Let’s get real here and quit acting like this shouldn’t be a big deal to neighbors.

Huge trees left in the front yards right in line with septic, driveways jacked up and triple layer shingles on roofs.  

I think I would focus on the landscaping and tree removal. 

That's a few hundred dollars a month right there.Housing is probably the only expense that works like that, but still.Also-I would like to think I'll be better off in 10 years than I am now because I'm spending alot of money on a new furnace, cutting down trees close to my house that are dangerous, rewiring areas of my house that were previously dangerously wired.

Ken,After you disclose an issue the buyers have what's called a "right to their own inquiry".What that means is when you disclose know facts when selling and the buyer is made aware of the fact they can investigate further.If the buyer chooses NOT to for saving money and wants to take the risk then it's on THEM.Remember anyone can sue for anything and doesn't mean they will win.Many times when they threaten a lawsuit they are fishing for quick money and to scare you.They probably found out after the closing that the problem is bigger than they thought to fix and now want you to pick up the tab.For a sewer issue all they had to do is get a plumber to SCOPE to line all the way until the street to find out exactly what the issue is.It could be tree roots,cleanout needs to snaked all the way until the street,etc.If you had a small pipe snaked and not the whole line that won't fix the problem it will usually just push the clog further down the line.No legal advice.

If they build stands or any kind of "treehouse" improvements, you'll want those to become part of the property and not have them try to remove when they leave and destroy the trees.