That said, we have this exact application that we have looked at/evaluated with one of our properties (duplex) that has separately metered electrical but one central air unit. 

It may impact someone who already has an existing respiratory issue, but it won't cause illness in a healthy individual.I recommend inspecting the property and determining the source of moisture.

I've always been interested in rental property, but I'm nervous to make a commitment that could put my finances on the line.

Just want to hear everybody's thoughts.I have several properties with over $100,000 in equity.

It's not great either but they are stating if given this deal once I have 5 properties; they will allow me to convert my 5 properties (I have an LLC but the properties are all in my name not in the LLC yet) over to a commercial loan (5 properties min) and give me a line of credit to continue buying additional properties.

I’m really interested in commercial RE, rental properties, flipping, investment, and possibly wholesale.

Were you able to see that property? 

It's great you want to optimize your property management on your first two, but you should also optimize the properties themselves before looking to buy anything else.

Are properties such as this more appealing to buyers with renters already on leases or will I get more interest and a higher sales price if I sell the property vacant?  

A property that is listed on MLS has been conditioned" to sell.