However most of the volume for these types of properties is in C or D areas with high turnover/lots of tenant issues.

I would not put a garage door opener in a C or D rental or Section 8.

In the Cleveland market, those are almost always C or D caliber neighborhoods within City of Cleveland.

3D printed houses: https://qz.com/924909/apis-cor-can-3d-print-and-en...Start-ups replacing Realtors: http://www.latimes.com/business/la-fi-ditch-the-re...

On a c or d class asset I’d keep em if they are in good condition however I would clean and paint them with fresh paint to jazz up the appearance .

I'm sure a LOT of CA-based investors primarily bet on appreciation and pay out of pocket for the expenses & mortgage. 

If I were you, I would start by making a scratch list of all the things you want to track and then comparing to the IRS Schedule C or Schedule E and seeing what things you missed.

Yes, you can get (theoretically) even more than 1% in rent but then your neighborhood would be C or D or even E class and the appreciation would typically end up being lower.The time when this was all possible is about 10 years ago.

With a C or S corp profits must be distributed inline with ownership shares.Hope this helps.

***Only exception is if an owner has plan & funds to reposition Class D to Class C or higher.https://www.biggerpockets.com/forums/776/topics/960183-what-they-dont-tell-you-about-cheap-rental-properties?