@Calvin Kwan -  We always opt for used if we can get them, but only if they're energy efficient models. 

New water heaters are more efficient. 

They do not provide meaningful oversight or guidance with respect to tax code compliance.A checkbook IRA LLC is an enhancement on the above structure that is generally more time and cost efficient for investors with a more diverse portfolio.

I am starting to suspect that while I might not do the most efficient thing from an investment standpoint, I will probably still land in a decent place going with my gut long term. 

I look at the whole screening process as being a way to efficiently get rid of the bad apples.

I have seen some great efficient airbnb setups in center city and fairmount.

I am in the business of running an efficient and strategic business for example wholesaling and flipping homes.

Make efficiencies of scale happen in a single place, and you'll go far.

Along the way I also was able to get free insulation installed (~10k value) using the local utility energy efficiency initiatives as well as laid plastic sheeting in the bare crawl spaces to help with moisture and bring it up to code. 

In markets where turnkey companies are able to exist effectively and efficiently most times gives insight to the future appreciation of the assets.