Prior to purchasing an investment property, is it fair to ask to interview the current tenants in place as part of the due diligence? 

I'd imagine all of these questions (like what would happen in an instance when one individual would like to sell) would be spelled out in some sort of operating agreement before purchasing any property.

I’m not purchasing both units just one of the two? 

Paying 2.4% for total closing costs (which include title search, title insurance, all attorney doc prep and recording fees) seems very reasonable given the relatively low $ purchase price.

I just booked 4 Airbnbs last weekend for an upcoming trip, and there wasn't any pet box for the pet friendly properties.

When we have investors approach us about a purchasing a condo as an investment, we steer them towards a townhome, preferably with a pool, if their budget permits.

The tenants informed me that they are looking for a home to purchase and would like to extend the lease until September and then month-to-month until they find something.

B grade property walks are attended by my children to run around and tell me which bedrooms they would pick if it was their home.43605, 43608, 43609 are the popular zipcodes for bottom-budget value purchases...I manage a ton in these areas and my personal portfolio contained over 40 43608 properties at the peak. 20% of these properties will be crazy money earners, 20% will be astounding money pits, and 60% will fare average.I have evolved into the nicer 43612/43613 for my personal portfolio and find the properties earn consistently and far smoother than my 43608 houses. ($80k renting for $1200 vs $40k renting for $800 multiplied by the ratio above vs boring consistency of the nicer area) Oh and I have zero excitement for apartments.

I purchased this book via Amazon.

If not you will need one as when you apply for any kind of financing  or purchase or sell real estate with an LLC they will need your OA.