In order to achieve your goal of 75 units in the next few years or beyond this goal, you should start looking into buying larger properties.

Now if I got into larger multifamily or notes that could be more challenging and interesting.

I’ve never been in a multiple offer situation and am not sure how to maximize the profits.

Because the loan payment stays constant, the house will become more profitable over time even though expenses and rent increase at the same rate.

The larger monthly payments resulted in negative monthly cash flow the past 9 years.  :(  At the time, we thought that was a smart move to basically defer our gains/short term income in the interest of having a paid off property in 10 years.  

Also if you run other businesses, a different structure might be more helpful.Currently, seeing that the corporate tax rate was lowered significantly, depending on how much profit you want to reinvest in the business, an actual corporation may have some benefits as well.I'll say that generally an S-Corp would be the way to go, but there may be situations that make a corporation tempting.Be sure to work with a CPA that knows your specific situation.

If you focus on profits you are far ahead of the game.

This is so important, I developed software to do this for me.What you are looking for are the micro-markets, within the larger ones. 

-I hope to make profit off of the appreciation, holding for 6-8 years.

 Not to beat a dead horse but I’ve had some replies to my former discussion, which indicates to me that in my quest to find my first flip property, not counting the last two houses over the last 4 1/2 years that I have successfully turned over for a profit using 2 30-year conventional loans, I can actually purchase a property using my S Corp.The only problem is,  I would need to live in the property that I am fixing up, as I currently do not have a permanent home-base.