Let's say someone has the knowledge and the contacts but needs the money or needs someone who can get a loan; or viceversa, someone who has the money, but needs someone with the knowledge and contacts to have successful BRRR cases. 

That one must deposit the money in a branch of a bank within NC?  

You can request those tenants to clean the bathrooms through rotations or just charge them a small cleaning fee to hire cleaning crews to clean the house 1-2x a month or you do the cleaning yourself to save up money and have extra passive income.

From a percentage return perspective, we currently have our money that is ready to invest in real estate sitting in a high yield savings account earning over 5% interest.  

Hello World, I have been doing research on "cash" offers as an investor and the results I have came up with is a "cash" offer can be consider any funding that is or has the ability to be liquidated without contingency from a bank; i.e. hard money, private money or your own cash.

Might be a money generator for future residents to pay to park. 

This can provide you with more leads for less money.

If an emergency happens, why not look into getting a line of credit set up now, so you have access to that money? 

Look into a hard money loan so you can get the rehab budget covered, and make sure the rehab budget is non-dutch so you do not pay interest on the rehab budget until you begin to make reimbursement draws.

I take some money off the rent.