Combine this househacking with joint venturing on some commercial property around the same market (5-20 units) with a few other investors that compliment your skillset and viola, you will obtain 30-50 units in 3-5 years. 

These properties are valued at a combined $430k and are both mortgage-free.

We are trying to help you not step into the mud puddle you are about to.Your attitude is a classic combination of a lack of self-awareness, misplaced bravado, and anonymity.

I want to point out that there is most definitely an element of economy of scale here - most profitable lenders need a team of people with specific skills to lend efficiently and profitably.

You can also purchase inside of a LandTrust for additional anonymityPro- Legal protection; combined with the right type of insuranceCon- Traditional bank will not lend to an LLC with no track record. 

If you were to combine several of the units together to the point there are only 5 units in the building, would this destabilize the whole building and be able to bring the rents up to market rates once the leases laps? 

Most folks struggle to get over the hump and never invest because every property comes with an element of risk. 

If it's a primary residence the total loans of $400k (1st + 2nd) equals 80% CLTV (combined loan to value) of the purchase price.

Some lenders will up to a 95% combined loan to value for a heloc assuming credit and income are strong. 

The combined loan to value (CLTV) has to be no more then 95% for most programs.