But I concentrated on buying newer properties that's new or only a few years old sold at auction.

I'm incredibly biased, but that's what I would do.The number of rentals is the wrong metric to concentrate on.

The limited review form does not ask about investor concentration.

We’re a meet up for all asset classes with a concentration on multifamily, and mindset will be central to our group.

Alternatively, concentrate on a more passive role.

Concentrated bleach, a garden hose, and a scrub brush made quick work of the mold on the concrete.

I told my daughter there is one word she should be concentrating on and that is :LISTINGS  LISTINGS = MONEY    representing buyers pretty tough.. but she does have 3 in pending where her buyers were successful but i had to pull out our big tool box to give her all the tricks we have used over the years to get in first position.and just glad i bought 18 months ago..

But remember to only concentrate on one thing at a time.

My properties are concentrated around Gravios park, but I'm looking to expand into better class neighborhoods. 

I suggest a good dose of C combined with B (cause that's inevitable).Just concentrate on #9 and #10 - real estate investing is a long game (at least IMHO).