If you need any additional help I will tag @Crawford Peay who is an experienced  property manager perhaps he can help. 

the majority of even my national users are looking to keep cash in reserve and as such are looking to landlords to finance that TIA as additional rent at a return premium and then that extra rent bakes off in whatever term is negotiated. 

Highest number of units without getting into commercial buidling codes at 4 units you have additional engineering requirements. 

For comparison, I just completed two new build duplexes in a flood sone in central Houston using a builder for these and my Hard + Soft costs were $149/ft. the only additional cost to factor in was the land.

Additionally, I’ll have the ability to pull equity out in the future to keep expanding my portfolio.Given my growing real estate holdings, should I even worry about my Roth 401(k)?

There will also be closing costs to refinancing into DSCR.Lenders need 6 months to refinance a loan, anything sooner, you're probably paying a good amount of points / DSCR has to be rock solid.There also may be additional costs in maintaining your property.

So your additional ~240 SF could be the foyer, hallway and bathroom spaces that are allocated by percentage to the unit.

It would benefit a lot if you are able to obtain US credit, US LLC and US Bank Account.

Most of our newer investors approach 2-3 lenders to discuss loan options.Some lenders recommend making your financing inquiries within a 45-day time period to avoid larger drops in your credit scores.All the best!

This money will be used to pay down some debt I have and also purchase 1-2 additional rental properties.