Everything you are saying checks to chart with what I had, and hadn't, been thinking in my line of thought as well.  

But more precisely it's an income property if you take yearly rent / purchase price + repair cost and if that is .12 or higher you have an income property.

The first chart shows what each partner invested and their actual returns.

The area that needs to be precision is your numbers on the deal. 

Having said that pre assembled cabinets are also better quality, because they are glued and pressed using precise squaring machines resulting in a more squared cabinet and a bit more rigid.

@Brendan SpaarHere are some charts that would confirm the positive direction.Fastest Growing County in each state.Appreciation from 2001 - 2014.

Cheers James,That's precisely why I moved to KW earlier this year - typically great performance from their agents when I bought as an investor. 

Since you already have 2 rental properties and are looking to expand to 30-50 by age 45, I added some links below to refresh your memory, build your confidence and help to chart a course on your REI journey.https://www.biggerpockets.com/renewsblog/2015/03/27/financing-options-rental-property-guide/ (financing options for rentals)https://www.biggerpockets.com/renewsblog/2014/03/06/bp-podcast-060-serge-shukhat/ (0-68 rentals in 4 years)https://www.biggerpockets.com/renewsblog/2014/08/02/passive-real-estate-investing/ (slowly building wealth through passive investing)http://www.biggerpockets.com/renewsblog/2013/01/04/how-to-rent-your-house/ (house rental guide)http://www.biggerpockets.com/renewsblog/2013/02/22/buying-rental-property/ (how to buy a rental property)To be more successful, you simply have to work on the other elements to progress your REI pursuit.

The level of detail and precision depends on your building department.Egress is often an issues with basement units.

I would love to find the actual numbers to back this up, or better yet, a graph or chart, showing a direct comparison between the stock market, and rental incomes over the last 10,20 or 30 years.