Only your half of the gain qualifies. 

Yes, they will do many things better than you, but some things it's not possible for them to be as attentive and quick responding as you.Also, no one's perfect, so keep tabs on them in general.Regarding holding or selling: why did you buy this in the first place?

Laundromats and carwashes have gained popularity exponentially almost in the 6 years. 

Building a portfolio allows you to gain experience, develop systems, develop your own approach to managing properties etc.

Did the proceeds from the sale count as short term or long term capital gains?

So you could see big appreciation gains (with no guarantee).

If you’re interested in investing in real estate, you can consider doing so with a Self-Directed IRA to defer taxes on capital gains until you actually withdraw the funds from your IRA.

What would you save in captial gains on the $360k if you sold now?

Additionally, your brother would inherit your cost basis in the property, which could result in significant capital gains tax if he sells the property later.

The investor has to be gaining cash flow or equity to make it worth it.