What's the best strategy to tackle this with.

If the homeowner wants to tackle it and risk it themself it’s the homeowners liability.

We have started to create a team that can tackle this project.

Oof there's a lot to tackle here- Hopefully you're working with a tax pro who specializes in REI to advise you. 

Everything else will work for some period of time but will fail much quicker than the 'good old fashion' methods... and the worst part is that you will have no idea it has failed until the floor joist have rotten out and the tub is sinking (yeah... the last renovation we did we had to tackle this exact issue from someone else's 'renovation').

Wholetailing is when a wholesaler buys a property, does a few minor projects and then resells to a buyer (investor) who is going to tackle the entire rehab.

I'll be finishing up a massive renovation project soon and I really think I'm going to figure out a way to hire out a little more work before I tackle another monster rehab.

However, generally speaking is it usually cost efficient to tackle major renovation (without sq. ft. addition) done at the same time or before I do any renovation, I would still first need to bring the existing structure back to code? 

I'm tackling many of the books from the BiggerPockets top 20 recommended reads.

The unit was in good shape when he moved out.What would be a good way to tackle this case?