Follow all safety requirements your Insurance Company plus city and county require.This usually includes childproof access and alarms.

So you know how that goes,  closer to the parks the better

Can you invest that money that would be used to pay it off in places that earn more than 7%? 

Could work, but remember people that need hard money usually need it for a reason.

Not only is the FedEx super hub close by(as @Aristotle Kumpis mentioned), but airports in general are usually near commerce drivers, meaning they work well for finding good tenants.

A couple of issues you need to be aware of are any ordinances that are in your town or coming up.

It's all about risk in the event of a lawsuit, which can also usually be covered by insurance.- If you decide to have an LLC for each property, creating a Management LLC that all the other LLCs "hire" to run their books, will allow you to only require a bank accont for the Management LLC.2) You may not be able to do a Trust.

so the title company if they have to pay it is going to be not so nice to the seller. the reality is if you dont do the intent to lien then yes you can get it removed usually though has to be done through the court title company wont take the risk..

Fewer but better properties will usually outperform more "affordable" properties. 

I lived for free for a couple years, while collecting rent checks.