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.

There is no comparison between the two tax levels.

Having entry-barriers to anything forces the participant to be able to perform at a certain level of capability prior to entry, and is a form of protection for all participants, both new and seasoned.

Will they stay at the 50% level if repairs have not been made?

Definetly spend some time networking with realtors, it will help you build your rep and will move your property much faster when it's listed.  

So some older buildings can be off level or have other issues. 

The level of activity and involvement are very different, especially when getting started...and they meet different goals/objectives. 

It also has high levels of Radon. 

Otherwise a new build would qualify.Another thing to keep in mind is that the investment must rise to the level of a "trade or business" Buying a principal residence (even if it is a new build)  would not be considered a trade or business and thus would not qualify (unless further guidance is issued)@Melissa Gittens here is an overview of QOZ's:https://www.biggerpockets.com/forums/51/topics/586...

Think typical old floor that isn't perfectly level in all places.