The trees outside aren't old enough to present a serious hazard to the sewer lines and the properties were all fitted with copper water lines to start with. 

Downfalls that I am looking to try to talk the seller into fixing before I would purchase: needs new windows, roof, and large dead oak tree in back yard that needs taken down before it falls. 

The best time to plant a tree is 20 years ago.

They are becoming more and more common/popular in the Joshua Tree area of California where I am an active investor/VRBO operator. 

Tree removal, shrubs/plants, deck/patio, seed/fertilizer, mulch, driveway replace/seal and misc.The snow caught me again… I had no idea what was hiding under it and unlike the roof… meh.

A tree fell on it and I had to get the insurance adjusters out. 

You're barking up the wrong tree unfortunately.

Two trees either need to be trimmed or cut down. 

There are much straighter and lighter trees that grow faster available for dimensional lumber: firs, spruces, and various other pine species.The rafters are not the biggest issue here -- a sturdy rafter structure is to be expected in a pre-truss structure, where simple solid rafters in line hold up the roof, not a complicated structure of thinner sticks taking up lots of floor space in the attic.You need to look at the attic floor from below carefully.

But, you never know when a tree root will plow through your septic system or water line.