I am aware of all the extra costs associated with rerenting, vacancies, HOA, etc...My question was just to see if I was getting the "basic" math correct.

You can always pay more and save yourself the interest (even on a fixed rate 30 yr mortgage you only pay interest for the time you have the $s outstanding).If you have extra funds, you'll want to do the math and see if you can achieve a better return by paying off/down your mortgage or acquiring another property.  

@Bryan Peralta Do your homework and have a plan in place stating what your goals are.

I would recommend to REALLY do your homework on New builds. 

For *most* sellers it is close to a wash, I think.few questions from me regarding the 3 options example specifically regarding the #'s. how do you do the math to come up with1) 1556/mo2) the 3 different purchase price options (300, 320, 350)3) the varying interest rates. i'm guessing the interest rate was calculated to keep the 1556/mo consistent?

You going to call 100 numbers today, call 200.My **BIGGEST** challenge when I started was organizing my day, getting my family to understand I wasn't on duty 24/7 for their forgotten homework dropped off at school, or being dad taxi all day. 

You’ve done your homework and your thought process is spot on from what I see.

This is why doing your homework beforehand is so important.

With my math...if it's bought at 130,000 and another 30,000 is put into Reno that's 160,000.

Even with buying 1 property per year for 20 years, the basic math does not come close to 480K per year.In RE , no income is ever passive IMHO