I’ve gained access to the basement and didn’t detect any foundation issues.

You need to understand the market, advertise to buyers, show it in the best light, know what to say and what not to say, be skilled at negotiation, understand contracts, and much more.If you don't know how valuable a good agent can be, it's because you've never used one, or they made it look easy because they are skilled. 

If it's going to be more than that, make sure you have everything well documented because she will likely make your life hell over that money. thank you for your valuable comment. 

Your guidance has been incredibly helpful, and I now have a valuable direction to further research.

When I die, they can keep renting out the properties or move into the SFH, or take the step up basis and sell it with not as high of a capital gains tax hit (I hope they wouldn't choose the 3rd option).

:) Thanks for the valuable insight!

I'm eager to gain hands-on experience and mentorship in this field.

Even then, if you've built up enough carry-forward losses, a nice capital gain may not trigger any taxes to be paid. 

I believe you were right he would inherit your cost basis, so he would owe capital gains.

I want to gain Capitol under my business name.