I’m assuming the lender would just factor our combined DTI and everything to qualify us for the bigger loan.If this is possible would the “seasoning period” start over if I was added to the deed?

Even a combination of the above... none of these options are bad, and you are in a very strong position!

I would recommend becoming the "authority" in your market with a combination of SEO, PPC/Facebook Ads & social media marketing.

Combine those 3 high risk activities together, and they dont just add up....they multiply exponentially. 

If you combine some of those you'll be headed in the right direction.

With syndications, you can spread the same capital across hundreds to thousands of units.Govt financing, conservative underwriting, and management execution properly combined; make multifamily (in my opinion exclusively workforce housing vs luxury, student, low income, etc) the BEST risk-adjusted return of all real estate asset classes.

I have long term rentals and am now about to launch my new construction business. I would like to roll some of my profits from the new construction into buying more long term rentals. I’ve consulted with my tax accoun...

If it is can it be combined with my mortgage since I'd be borrowing from the same lender?

They can bring the price down to match the appraisal, or you can pay the difference at closing or any combination of those two options.

Both units combined should rent for 1400 to 1500.