That's mostly because I don't want to be too heavily concentrated in one area, but partially because it's been rough.

Use MMR available at home depot. 1 product will kill the mold, but the stain remains, the other will remove the stain (super concentrated bleach w surfactant) so, you will need ventilation as it's strong. 

Concentrate on making first the hundreds of thousands in equity (owned equity, not financed property!)

It will save you a lot of valuable time so you can concentrate on growing your investment portfolio instead of crunching numbers.This post originally appeared on the BiggerPockets blog.

Home ownership will get more concentrated. 

The portfolio of homes would do a lot better if the rates weren't trash, and since they are a bigger pockets member they became aware that you can wrap up a bunch of single family homes into a single commercial mortgage (sometimes called a "Blanket Mortgage"), generally if they are geographically concentrated.

Right now I am concentrating on a single style (LTR small multi in CT) and a catastrophic event here would frankly put me out of business. 

If your goal is to grow your LLC, consider arranging all of your properties under an agreement with your LLC to manage them & take all of the legal steps to ensure that the structure is correct. this may involve creating LLCs in the state(s) your LTRs are in to own the property and your PM LLC managing those properties, so that you don't have a concentration of all of your portfolio in one entity.

Concentrate your education on real estate principles, real estate law, and real estate finance2.

Unfortunately, I am not hearing it in the two markets I am concentrating on-- Smokies & Austin.