I doubt he'll be able to quality for a loan (VA) with just his income. 

If I got a home equity loan for Property 1 and used the proceeds as downpayment for Property 2 and then got a 2nd loan for the remaining 75% purchase price for Property 2, when I sell Property 2, can I use the Property 1 loan as part of the cost basis for computing Property 2 capital gains?

10% down 2nd home loan and savings from the proceeds of already owned STR's.

They will go up to 100% loan to value or LTV (or used to). 

Minimum loan amount is $250k.

So there are a million realtors, loan originators, accountants (RE is, for most, not complex vs other small business.)

I do not have any loans through Flagstar Bank, but I would talk to them prior to moving it into the LLC.

Again, the $600 interest threshold is per loan, not per person.But this was not my money!

They have taken strides to pave the way for ADUs - here’s the implications for real estate investors.It's crucial to understand Raleigh’s zoning rules for ADUs BEFORE deciding to implement this strategy on your current or future long term rental, Airbnb, student housing, MTR, house hack, flip, etc.

Yes, you can “save” interest by paying off a loan faster - SO WHAT?