Hi @Alex McKnight. Sorry for the slow response. Here are some thoughts on how I moved from 2 units to 5 (I now own 7 buildings, 12 units).
1. I used the first building as a case study. I read every word of every closing document. This helped me increase my knowledge of all parameters of a real estate deal and to appear knowledgeable to the real estate agents, bankers, lawyers, etc. I would deal with in the future. I forced appreciation by rehabbing as much as I could. I wrote a detailed listing and created a good application process to attract the best tenants I could (they are still there 5 years later). In short, I used the first building to explore, understand and then build systems that could easily be applied to future investment properties.
2. When I went to buy the second property, I called the banker I worked with on the first property. He didn't call back. This ended up being a good thing, because I decided that if I had to connect with a new bank, I might as well call every bank in the area. So I did. I found another bank to work with, but I also gained an understanding that all banks and bankers are different and that bankers are people. If you build good relationships with them, it will pay off. Example: When I went to buy my 7th property last Spring, I called my banker and he had a prequal letter to the real estate agent for me in about an hour. This was important because there was a lot of interest in the property. That quick letter allowed me to be first in line and helped me secure the deal.
3. As teachers, we have pretty secure jobs. Banks love the W2 income. In my case, I had 3 more advantages related to my job: (1) my wife is also a teacher, (2) we have both been teaching for about 20 years and so we are finally making some decent income and (3) we have a good bit of equity in our house. Using the equity in out house + our solid incomes + my solid record in running our properties well + my relationships with bankers + my ability to talk to all the relevant people (agents, bankers) knowledgeably helped gets the deals done.
4. Always be looking and analyzing. I'm constantly on Zillow checking out properties in my area. I drive for dollars almost every day by taking different routes to work and when I run errands. Last Spring I came across a deal I wanted to act on, but I literally had almost no money in the bank (I had just purchased a duplex a few months before). What did I do? I called my parents who (1) owned their home free and clear and (2) were not in the best shape in terms of retirement income and proposed a deal -- use their home equity for the down payment and then use my income to pay the bills util the apt building was rehabbed and rented. We would share the equity 50-50, but my parents get all the cash flow for the rest of their lives (I don't need cash now, they do). So I contributed my knowledge and deal making ability and my parents contributed their home equity and we both made out great.
5. Last idea -- I haven't succeeded at this yet, but teachers like us are surrounded by a lot of other teachers who also have steady income and summers off. The potential for partnerships seems good to me.
Good luck!