Odds are that you won't be able to maintain 16 of them correctly and if you don't, then they are worthless. 

Maintain lock boxes.6.

I would also like to purchase and renovate a duplex or triplex and maintain for rent.

In that area, it was likely the thieves had actually posed as interested tenants and scoped the place out.

We're investors... we don't care as much about things like cost per square feet and exterior as we do about the expenses of maintaining it and the income it generates. 

I welcome your comments on what in your opinion sells house :We all know the usual suspects are :Lots of light - Big windowsEffective stagingCurb appeal (well maintained front)Updated kitchen (new cabinets, flooring, counter tops, light fixtures)Updated bathroom (modern look, new light fixtures, big windows, big tiles etc)Big closet space in the roomshow aboutFinished basement ?

I can't say that I'd enjoy standing in the rain fixing shingles but I would like knowing my properties are well maintained.

August last year I asked myself the same question you posed.

Lots of great tax breaks such as mortgage/ mortgage interest, expenses to maintain, travel expenses to maintain, insurance, PM fees, credit card fees, etc...

I drove through my first Mobile Home Park the other day and was surprised as to how poorly maintained the homes and yards were.