I would say larger concentration of younger people in the zip code would be a decent positive indicator for success...

@Drew HoffosJust concentrate on making contact.

Most listing agents concentrate primarily on listings.

You also have a property that is taking maximum advantage of leverage and the favorable rate environment.And, you've concentrated your cash so that if a next deal comes along you'll be able to do a refi on that new property to purchase another good investment.

Good luck   I have always thought if pro athletes banded together along with their drive and competitive instincts the collaboration and concentration of wealth and incomes could be a pretty formidable group/association whatever.

I have since decided to pivot and concentrate on rentals (both long and short term) with concentrating on short term rentals in the beginning.

I turned over my buy and hold multi family investment to a PM so I can concentrate on legal work and the acquisition part of real estate.  

It helps to focus on what are called "Fleet Concentration Areas" because it's going to be really difficult for the Navy to station their ships and submarines somewhere different without PLENTY of advance notice.

As we have seen during past crises, black swan events can decimate portfolios that are highly concentrated in one asset class.Also, there are probably advantages to tax diversification as well, since tax rates and the tax system itself might change. 

@Mike MorawskiGreat point -- and honestly a big part of my decision making process on where to concentrate was this question: "Where do I go anyway?"