I personally don't call It investing though.I agree with you Jay.A smart engineer from my office calculated that someone who makes $200K/yr or makes $100/hour - it's actually costly for that person to buy a single family home that he rents just to make a $200/month cashflow. 

I want to work smart and allow my money to work for me.The Want:To purchase first rental, a 4-Plex in San Diego this winter.

I’m looking through reviews on glass door, etc to see what people’s experiences are

Many very smart investors here who are most willing to share and a whole host of top-notch vendors too.

Summarize your deals - like you did above - and why joining you in investing is a smart wealth strategy. 

Heres a backdrop on my situation.1) I bought my first house in 2014 not knowing what my intention was other then that was the smart thing to do (haha).

Smart Phone photos, or professional, wide-angle, HDR still photos? 

Has anyone else heard of this, Amazon Enters The Real Estate Game, Launches Smart Tech-Heavy Homebuying Programhttps://www.forbes.com/sites/alyyale/2019/07/23/amazon-enters-the-real-estate-game-launches-smart-tech-heavy-homebuying-program/

Well, besides PITI, there's maintenance which is basically the amount you allot to take care of things like replacing a door lock that someone used a pliers on, broken glass, door weather seals, HVAC maintenance, supplies to maintain the lawn, termite treatment, replacement boards for the fence, caulk and paint, etc.

Is it smart to have higher end rental properties ($400k and up) or should I invest in lower end / middle class rental properties?