You start by mentioning your age... you'd need everything to go just right for the rest of your life to make, best case, $400 or less additional each month net cash flow. 

Many of us on here wish we were thinking about real estate at that age.

There is so much to learn between the ages of 18-22. 

My question is: could the current tenant (age 59) remain in the property if she becomes eligible for Section 8 assistance?

Congratulations on building such an impressive portfolio at such a young age and achieving so many successes!

Hi @Jinxiang XuFoundation repair is common but no pipeline replacement, it depends on the age of the property, but in your situation it could be due to the foundation work done.Service prices are in all ranges.

For (2), as properties age the rents you command decrease. 

Also, I am thinking of investing into real estate via a new Self Directed Roth Solo 401K account due to tax free distributions after age 59 1/2 instead of SEP IRA, any thoughts? 

It’s really amazing to see you getting started in real estate at such a young age and Out-of-state multifamily investments are a great way to begin. 

.- Personal Articles: Coverage for belongings that have a special or collectors valuesuch as Jewelry, Furs, Fine Arts, Collectibles, etc...Your age should not be a factor on the pricing but, depending on the company these other factors may get you credits:- Insurance Score (company pulls certain info out of your credit report).