Scaling- no matter your goal, current size, or timeframe you will run into Collateral or Finance constraints. 

A large portion of your net worth will still be staying tied up in the stock market even after selling much or all of your brokerage account holdings to invest in real estate.

You MUST occupy the home for some portion of the year and you definitely CANNOT use projected renal income to help you qualify.

Here is generally how the strategy plays out: when a sponsor acquires a property, performs a cost segregation study, and takes the bonus election, the portion of the property's value that is allocated to land improvements gets depreciated 100% in the same calendar year the property was purchased.

I had an older building similar to what you are describing and the electric from the common area, gas, water, and lawn care, quickly ate up a significant portion of my cash flow.

Check out some of the forum posts, review a few for features that you like, and try it on for size.

Because I already had a loan for the first three buildings and used a large portion of my own money as the down payment, I could not get a bank to loan me the money for the office building. 

Seems like the size of your portfolio will determine which option is best for you.

Discussion of LLCs is a big topic and filled with many factors with no 1-size-fits-all solution. 

I'd focus on your home market, network with brokers and agents, and define what size property you want to buy.