Before I talk about how to select a tenant segment with a high concentration of reliable people, you need to understand the relationship between a tenant segment and the property.Every tenant segment has specific housing requirements.

Therefore, you should buy properties that attract the segment with the highest concentration of reliable people.Each property attracts only a single tenant segment because its characteristics match only one segment's housing requirements.

Now that I’m in my early 70s, I think that’s TOO MUCH concentration.  

It's amount of WORK and CONCENTRATION that will make a difference between make or break, and no GURU can make you stick to your regimen and do something persistently and systematically if you can't make yourself do it.  

You're correct that the Clark/Fulton area is a bit rougher and is known for having a higher concentration of Section 8 housing.

We've negotiated some in a portfolio where a certain house will be at 25-30%, maybe even as high as a 35% but the loan is less concentrated in houses with less of a downpayment(10% needed for a STR). 

Right now I am concentrating in the Philly suburbs. 

Therefore, identify a tenant segment with a high concentration of reliable people through property manager interviews.

This strategic use of financing and leveraging equity has been crucial in scaling my real estate investments.Key Lesson #3: Diversify Your Real Estate Portfolio Early in my investing journey, I concentrated too much on a single market or type of property.

For example, if you want to concentrate on just doing wholesaling,  find a group that does JUST THAT!!