I recently went to a seminar regarding multi-family investing where they attempted to sell a $40,000 mentorship program.

Especially if you ever decide to sell the property later down the line.

By the end of this year you could be selling homes and have a much better income coming in to fuel your investment goals. 

Your second point about utilities selling high and buying low is one that annoys me. 

We are trying to figure out a way to sell ours.

But what if we want to sell interests in the LLC after its formed to help subsidize the build?

You can choose to take on the associated liability issues in doing this, but a good PMC CANNOT.You may consider selling your Class C and D properties and buying Class A & B if you can't handle the challenges.

I can listen to books and educate myself on whatever I want while at the gym, in the car, etc.There are a wide array books available and a few I think may benefit you to start with are...Buy, Rehab, Rent, Refinance, Repeat - The BRRRR Rental Property Investment Strategy Made SimpleFLIP - How to Find, Fix, and Sell Houses for ProfitThe Ultimate Guide to Wholesaling Real EstateBigger Pockets has become one of my best resources.

So hypothetically if someone bought a house in 2023 below market value for $500k with $550k ARV comps in the area and locked in 7.15% APR as a primary residence -- would you hold or sell to capture the upside in the home? 

After a recent fire that destroyed one of my park-owned homes, I am determined to sell them all.I bought this community for $694,000 with 8 park-owned homes and two single-family homes.