My thinking is that since I can put that $25K into an environment that will yield 20%-30% annualized ROI with tax free Roth characterization, I may as well take the tax hit for cap gains and SE tax now then grow that money tax free in the Roth soloK.

You'll want to also discuss with the attorney how best to structure the transaction as a gift or a sale, as there will be different effects both ways, and if you are not giving any consideration per se and only co-signing the loan, it may have to be treated as a gift. 

It looks more like a rust belt SFR than a house close to you in the SE?

You will find that each septic tank services several units per se & that each tank & field must be operational as I doubt if they are in series or allowed to operate as such.

It’s a liability only when you buy a house in hot market, overpriced and do updates which is too personal (won’t Ina se the resale value).

Insurance-prohibited dog breeds require a $2 million rider on their required renter's insurance indemnifying the owner and management against those breeds actions.NOTE:  I LOVE dogs, and I totally understand that it's not the breed per se, but the owner or inbreeding puppy mill that will usually determine the dog's behavior.

@Dexter De Mesa Impressive returns but you don't get the appreciation like Cali or SE United states.

Since, s-Corp revenue is generated via service of the sole shareholders, you will highly unlikely that you will save on SE taxes. 

Llc’s and corporations are generally not allowed to go to court pro se (without a lawyer).

If you want to meet some people, there will be 100+ people from the Portland Real Estate community Thursday night at The Evergreen in SE Portland from 6ish to 10ish.