My brother had access to the other $160K but ultimately purchased a 4-plex two months later using his own money instead.Currently, its written that if my brother doesn't use the funds then he gets 160k value from the estate extra, as I used my half already but then my dad suggested a 2% annual appreciation on that amount seems fair on the 160k for him, and now he believes it should match his home’s appreciation, which is roughly 5% per year.

When doing BRRRRs you may have to leave some money in your deal but you’ll still be able to scale a lot faster than the typical buy & hold strategy.

Keep wasting your time then and looking at MLS deals ;) You can make more money and actually get deals going direct to the seller instead of this.

I had the appraiser come to my property once when I finished 90% of my work to verify and now I am using the rest of the funds to renovate other parts of my property since I had money leftover. 

They make money off of the fees going in.

I work for a hard money lender called Backflip and we have members/investors do flips in flood zones all the time.

Sell them on coin base, then just use that money to put down.

The approach involves using a hard money lender (HML) to fund 75% of the purchase price while having the seller carry back 25% in a second-position loan, allowing you to flip the property with little money down.

Best of luck to all you out there.How much did you pay for these 3 buildings initially and how many years did it take you to earn the money to pay for them?  

The other two don't take into account the time your money is tied up.  15% of ARV is great, if your flips take 3 months.