Our issue is income on papers too low to qualify for the an FHA or traditional loan.

Maybe he's the exception.But the good news is - no matter what you do, if your brother just leaves it all as "passive" and doesn't mess with anything, whether short term rentals, or traditional rentals - the right tax planning could mean a box of his investment dollars that is effectively able to grow tax free. 

Do you use traditional financing or do you us DSCR loans?

This would also be where an appraisal would be ordered in a traditional sale, but if using a hard money Lender, they have probably already evaluated the value before offering you terms.5.

I've done a lot of wraps and subtos and highly prefer the seller-finance strategy for a lot of reasons, including offering the opportunity of homeownership to those otherwise rejected by traditional banks.

I've also used traditional loans through regional banks and a few SBA loans. 

In short, I’m trying to figure out if it’s worth pursuing an off-market seller financing deal versus getting a traditional loan and competing for the property on the open market.

I bought it because it was supposed to be easier to keep up with than traditional, but I've had to rebalance the ph myself several times.  

Major brands like Ritz Carlton and Waldorf Astoria are currently developing property there, where they have traditionally developed in Miami, Fort Laud, and Palm Beach. 

The idea is to convert a multi-family building into condos; but not in the traditional sense where you separate pre-existing apartments into their own condos; but in a way where you combine the common areas of all of the apartments in that whole building, and turn the individual rooms within those apartments into condos themselves; thus transforming the hallways, kitchens, bathrooms, living rooms, dining rooms, porches, balconies into common areas of the condos.