Insulation and energy saving items are the only things that consistently return more than you spend, but they only on the order of 102% or so.However, if your local market is a hot seller's market, you probably don't have to do anything at all.

I personally prefer markets where the C+ asset is extremely viable, and the data you see on a lot of these economic & demographic studies is not high resolution enough to pinpoint a subsection of a market that works really well.Ex: I have a C+ area in Indiana that I love which produces 10%+ cap rates consistently at market value with extremely low turnover rates.

Well...First, the leases do not typically have annual bumps, track market rates or inflate consistent with CPI.  

That's a lot of information, but one point that was consistent is; don't over analyze it, just get started.So, after driving through neighborhoods on my way home a few days ago using the landglide app, I found my first potential property.The house looked vacant and the owner's address was next door.

I'm sure the idea is that only a very low percentage of people will be consistent and achieve whats possible, but that will benefit everyone.The problem is when I pressed for more information I got the run around sales talk.

My wife and I go to parties and gatherings for social reasons and find ourselves consistently lying to fit in.I could not have predicted how weird this life gets.

I was even denied a home equity loan recently with more cash on hand than the loan amount because of the lack of consistent income. 

You'd have to be looking at D/F to consistently find returns in excess of 1%.

The property is residential and improvements consist of adding new central air to both units.

@Sam Leon If you have specific provisions within your leases, you can always gather proof they are violating them on a consistent basis, then move to evict.