Our debt include only our primary, the duplex, and credit card $3,175.91+$7,317.49+$2,000=$12,493.

Yes, it requires work to run an LLC properly.  

A secure building will appeal more to potential tenants and provide peace of mind.Energy Efficiency:Ensure the property is energy-efficient with proper insulation, energy-efficient windows, and appliances.

To what degree is a wild card.  

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

(Trying to skimp on coverage by not telling them you're Airbnb-ing the place will defeat the purpose of insurance if they deny a claim because you weren't truthful.)There are specific STR insurance carriers like Proper Insurance, but most major carriers offer a rider for vacation rental or short-term rental insurance as well. 

The proper timing and structure of that loan are unclear from the information in your scenario.

I've come across a piece of land that is properly zoned in a growing industrial area.

@McKinly SpringerThis did not bond as they didn’t prep the floor properly nor was this done properlyIt does not appear they even used a self leveling material like ardexTo me this appears all of it needs to be ripped out and redone properly

Your accountants will love you and hate you as they love you because they will charge you a fortune but despise you when you do not put money in and out properly.