So if you concentrate all your holdings in one small area where you have a higher vacancy rate or higher taxes, or higher anything, then you could very well see different results and have to adjust according to your market.With that said, does your area have lower thjan average property taxes?

Keep in mind that most zonning categories are progressive, that a property use can be used at a lower concentration but not higher.

Mitigate your risk by avoiding trying to find legal ways to reject a applicant and concentrate on finding applicants to accept. 

Also, this can be the danger with areas that are heavily concentrated STR pockets and have a lot of newbies that enter the market only to get fizzled/beat out by experienced competitors. 

Your guru groups concentrate on the artful side with the paint by numbers set of making a deal because it's the easiest way to develop a product to sell you!

There are many ways to make money in real estate in concentrated efforts.

Unless you have a clear policy outlined in your rental agreement that say no cannabis.

My ultimate goal with real estate would be to have enough passive income to be able to provide extremely low priced apartments to refugees (they then could concentrate their very low income on getting diplomas to break the poverty cycle they usually get into when they arrive) and to fund a NGO to help them settle and get a good start in their new host country. 

The paragraph on cannabis has me thinking.

I am not aware of a concentration of military but they like living iff route one which stretches from Fredericksburg to Alexandria and paases both bases.