I signed the 40 pages of documents, and missed that small, singular checkbox on page 20 which said the rate wasn't locked in.Fast-forward 1 month to today, 3 days prior to closing, and to my surprise the interest rate on the loan closing is 1% higher than what was originally discussed, costing me tens of thousands of dollars over the life of the loan!

If you've got a singular offer and it's at your asking price, congrats!

You can look at portfolio lenders if you are looking to purchase singular deals or multiple under a blanket loan but there will be an underwriting process for each property that you put under contract 

I did a substantial bathroom and kitchen remodel as well as removing the old singular oil furnace (Which I footed the bill on since it wasn't a split system) and added central air and a separate upstairs unit so the tenant now pays their own heat.

Depending on your investment goals, you could work with a custodian (singular, static, low dollar) or a specialty provider that offers checkbook control IRA and Solo 401(k) plans (more assets, transactions, dollars).

While I am a big fan of the owner finance BRRR, I don't singularly rely on it as my income method. it would be silly to think one form of an asset could give me all the money I need for my lifestyle, yet that's how most people approach real estate investing.

Or does the extra QZOB layer seem unnecessary if it's just a single property that I'm nearly singularly deploying the cash into?

If you make it "___buys houses" well, then that won't let people know you could offer them other solutions beyond a singular cash offer. 

Is the name singular where it should be plural?

More specifically- do you find a singular renovation contractor to do as much of the work as possible, or do you source each trade individually?