How would a lender underwrite this scenario?

[Sean Bramble]

I'm interested in doing a DTI-based construction to perm loan to build property. I qualify today based on my DTI, but have a large untapped securities backed LOC that I am planning to use temporarily for another investment (I will pay it off soon after ... before applying for the construction loan). Question: will using the LOC and then paying it off BEFORE I close the construction to perm loan count against my DTI for the construction loan? I technically will pay it off before I apply, but just curious if there is some sort of lookback period lenders underwrite with that I need to be aware of. Thanks!