Separate loan for home build and ADU?

[K S.]

Basically, I'm building a triplex and two ADUs on the same lot at the same time under the same architect and construction crew but I wanted to get a separate construction loan for the ADUs. The advantage is that I can pay off one of the mortgages faster which will greatly reduce the monthly payments as opposed to a single mortgage where charging half of it off wouldn't change my monthly rate. I would have to refinance in that case.