I’ve seen people hit a wall with red tape when trying to remove secondary kitchens or bathrooms.Finally, make sure the math works out.

-is it a good time for a person with no savings and no experience to take out a HELOC or personal loan and buy a random property in a state they've never been to using 100% leverage because made up spreadsheet math assumes no vacancy or capex or repairs ever and rent growth of 9.2% a year until 2074? 

You don't get to pick them.The math should be fairly elementary. 

I'm outgrowing my side and I want to buy a Single Family Home.Would I have to get a secondary home loan therefore having to put down 10-20%?

The rents are on the lower side, but I am also not looking to raise them significantly as the best thing about these properties IMO are the very long-term tenants.When I do the math, I'd have a lower monthly payment and pay less interest over time even at that premium price versus a lower price and lower rates in the next year or so, but I likely wouldn't be able to sell any of the properties at that value for quite a while.Is there anything I should be thinking about that I am not?

I am an engineer so the math for calculating what is due based on sqft and occupancy isn't a challenge.

The HELOC has a 8.5-9.0% rate on it, so we'll do the math on the penalties for dipping into the 401K for the down payment vs the HELOC>

I get all the debt arguments, the "math", whatever logic is used, etc.I still subscribe to no debt or limited debt.

I am considering renting it out, but the math is not adding up.

For quick math one month vacancy is almost 2k lost income, re-leasing expenses 2k and there are always at least 2k worth of work (sometimes just upgrades we choose to do).