Also Solo 401k could be a better option for you if you're self employed with no FT W2 employees.   

When I start to post, I don't see "furnished" anywhere as an option for listings.

Should effort be placed in a baseline business plan to determine the best option to start in for this field?

The property is rented out for $3,200 per month, while my mortgage is $2,100, and the HOA fee is $268.I explored the option of taking out a second mortgage.

Other than Regus there are very few options. 

That would be best option as a traditional bank wouldn’t do this I read that I can assume the existing mortgage.

But there are options for interest only first five years. 

I would first check to see if HELOC is even an option - in TX its hard to find and can only be done for a primary residence.

By gradually optimizing operations and reinvesting in infrastructure, the endowment can support more affordable housing options without destabilizing the market or alienating investors.Currently, we’re integrating three plumbing companies under our organization’s umbrella.

Many investors switch over to these loans once they have a few properties (typically 5 on average, but you are right there in the typical fashion for property number 4)Check out these series of articles on the loan topic published on BP as well for all you need to know about this option!