If you are purchasing in your own personal name, you might qualify for a traditional Fannie/Freddie type conforming loan.

The percentage of your debt after you purchase your rental property, again assuming a breakeven cashflow because you're a Bigger Pockets and have found a deal, is 40%.When you start out with your debt to income ratio at 40%, without considering any negative cashflow payment on your new purchase.The two conforming lenders (Fannie Mae and Freddie Mac) want at total housing debt to income ratio of 36% housing and total overall ratios combined of 40%, but will go to 44% if everything else is in line.

I have W2 income and am not asking for anything outside of conforming loan limits.

If the property is zoned residential, then a Non-Conforming Use Certificate (NUC) is required.  

You may be 'existing non-conforming' (grandfathered) on the elevator standard (i.e. size or location ect), but something begin broken and never fixed doesn't make it grandfathered.

Frankly, I am tired of PA and Midwest investors attacking the NYC/NJ markets because they don't conform to the "Bigger Pockets golden rules" for investing. 

Too dangerous and does not conform to recent codes...

Legal entities aren't eligible for conforming residential loans which is the all the same to you since you aren't a US citizen anyway.Good luck.

You don't need to use a DSCR loan unless you're buying properties that don't conform to standard guidelines or are trying to do cash-out refinances prior to the 12-months seasoning.It will be safer, and you'll sleep better, if you can: get the additional $10k from working, get a 5% discount on a house, find a property where you can add value through renovations or re-purpose and end up <75% LTV (aka., buy at a discount).

In Seattle the requirements for a separate panel in each unit, usually separate electric meters, separate heat sources, separate hot water heaters and plumbing runs, etc make legalizing a non-conforming unit pretty expensive.