If the fan is not properly attached to framing or a for-the-purpose brace, they certainly can vibrate and become loose enough to fall.Having the ability to move air when temps are uncomfortable provides pleasant relief, and is FAR less costly to operate than an AC, which may be an important issue for the Tenant.

You need to prepare for these operational cost increases that are out of your control.

The owner paid $150k in 2003 and was an operating business.

If you run any type of operating business (like a property management company) - I recommend that be in a LLC.

We're selling a duplex we own and plan on buying a house that also operates as a business.

Commercial multi family is dominated by apartment developments filled with amenities and rents that were the first to reach the top of the market and the first to see rent decreases. 12 unit compares well to 3/4 unit buildings with some operational efficiencies. 

No idea, luckily it affects the inside 0% so we can continue operations if guests choose to stay.

I will use my knowledge in the home inspection field, owning and operating my home inspection business, the relationships i will make during that time, my experience in being a landlord and my knowledge as an licensed electrician and home inspector to help convince my investors that i am serious and have the skin in the game to get deals done.

So don't operate just hoping the 1 to come through, no, you should be working on plan B until have that set, plan C, D etc.. 

While self-managing rental properties is an option, partnering with a reputable property management company can streamline operations, enhance tenant screening processes, and ultimately optimize returns on investment.