I may be wrong on the best trade but plumbing would be my choice, if I had to choose.

You really didn't do it all by yourself.Some of these brokerages are average 1 transaction a year per agent to less.A lot of these big brokerages stick 3 to 4 agents on a team and pump out selling listings given to them by large REIT's and other sellers.By choice I work with clients one on one and spend the time with them educating on the process.

If you have patience, willing to learn, and able to live without the income you may get from a rental property right now the 12 unit apartment building is the better choice. 1.46 % x 12 = 17.52%/2=8.76% cap rate.The thing you have to make sure of is if the 12 units are all rented out now and if not what is the historical occupancy rate.

But that's totally a personal choice and is up to every individual. 

Personally, I keep my multifamily rents slightly under market as I like to have high demand and figure the higher occupancy, choice of tenants, and lack of griping more than pays for missing out on squeezing every last dollar out of market rent.

A lot of rentals in Dayton are lower priced and won't support that loan amount.Huntington is a good choice.

Number of units, location, quality of tenants, condition of mechanicals, financing alternatives, management and maintenance choices, etc. 

Ceramic tile or vinyl are much better choices.

As far as representing myself goes; you must be a lucky guy to have never been dragged into court as he would have a field day with motions and every trick in the book to buy him more time, and ultimately staying in the house longer than he would have to if I had a lawyer.I do have multiple other properties that are cash positive, but with a mortage and expenses at $1,000/month plus legal fees starting at $5,000 (lowest estimate after three lawyers) I don't see that much of a choice. 

Brokers get lot's of crap offers and if the clients have said do not bring me this and this that is the sellers choice.