(assuming the cash flow is higher than PITI).My second question is if I acquired a duplex via seller financing, would that also decrease my DTI?

If I get stuck with the storage cost in that scenario it is MUCH less than a $100 fine per day for a month ($3,000). 

I am declaring primary residence but will live elsewhere as my lender only requires "intent to move in by 60 days" with no proof of move.Three units - $4200 rent income1st unit (3 bd 1 bt, ~1000 sq ft) is currently vacant, previously rented for $1600.2nd unit (3 bd 1 bt, ~1000 sq ft) rented month to month at 1050. can get $1600 as well.3rd unit (2 bd 1 bt, ~800 sq ft) rented for 1000 until April 2025. can get closer to 1200-1300.

Your interest income will be taxed differently than the average joe.

According to Opendorse:The collegiate NIL market is projected to grow by more than 40% this year, with an overall estimated market spend of $1.67BThe collegiate NIL market is projected to eclipse the $2B mark in tandem with the highly anticipated revenue sharing slated for the 2025 academic yearIn the commercial segment, Women’s Basketball is in the number two spot for total compensation, second only behind FootballBy 2025, Top 25 NCAA DI quarterbacks can expect to net more than $1.3M annuallywhen factoring Scholarships & Benefits, Commercial NIL, Collective NIL, and Revenue Share paymentsCompetitive collective budgets within Power 4 conference are up 50% YoY, amassing to a war chest of $13.9MWhat schools have the top NIL Budgets?

The rules are drastically different than the US.

making the tenant aware of their obligation or upcoming obligation is more than acceptable imho.  

In your case, the finance charges you are currently paying will likely be less than any construction debt you originate so I would recommend first confirming with the existing lender how to release the developable parcel and then obtain all of your approvals before proceeding. 

It seems so much better cash flow than properties listed in my area, where you're lucky to get a couple hundred bucks.Example of break-even in Tacoma, WA:https://www.redfin.com/WA/Tacoma/3734-S-M-St-98418/home/2978...What am I missing that these seemingly ridiculous cash flow properties are available in other areas in the country?

If you don’t have enough money for an earnest money deposit than you shouldn’t be doing the deal.