Diversifying into several geographical locations makes sense to me.

You could do several mobile homes on it, maybe turn it into a mobile home park.

There was a vacant property on my street and several months back, I'd made contact with the management company and told them I'd be interested in buying the property whenever the owner was ready to sell. 

. ;) So it's actually a great idea to keep an eye on this metric as its often used as a benchmark for the health of the SFH market. 

Sell and use the money for one, several, or none of the following:Put the gain in the stock market.Partner in a more passive way in real estate. 

I am planning to sell my rental house and 1031 exchange for several new properties.

If that's the case, you could contact any number of really great CPAs here such as @Natalie Kolodij, @Steven Hamilton II, @Daniel Hyman, @Ashish Acharya or several others.

I personally have one property under management with them and my mentor/development agent has several (30+) with Vista.

I was alerted last night & got in touch with the HOA, who confirmed that the leak, regardless of where it originates, falls under my responsibility as homeowner.I’m out of state and severely disabled so I can’t check out the damage or repairs in person.

Do the deal on your own, then have your friend rent a room or unit from you.I don't do deals in Boston, but do deals in several MSAs.