You're mixing regulations. You have a Reg. Z determination to make and a Reg. C (HMDA) determination to make for each loan.
If each loan is PRIMARILY for a business purpose (the majority of funds tie back to the original purchase of non-owner occupied rent homes), then each loan could be exempted from Reg. Z.
However, for HMDA, each loan has a HMDA purpose (actually, 2 HMDA purposes)....purchase and refinance. Since purchase trumps refinance in the HMDA hierarchy (it doesn't matter what part of the funds are going for a purchase and what part are going for a refinance), then if funds from each of the 4 loans are going to be used to purchase his primary residence, then each of the 4 loans is a HMDA PURCHASE.
_________________________
I'm fixin' to fix that.