Aim for a credit score of 680+ for better refinance options.

Since I'm a new immigrant with no credit score, a DSCR with 30-35% down payment is my only option, so the 50K need to include that down payment alongside all other costs (closing, rehab, etc). 

Narrowing down the options will probably come down to comps and city/neighborhood specifics; things like permits.Any good suggestions for finding out how long permits are taking in certain areas?

As you are living in the US and might this virtual LLC office work, it could be an interesting option. 

Here is a link that provides fantastic information on the turnkey investing option from BP. 

Using a HELOC for the down payment on the second home might be an option, but lenders may require you to wait a few months post-closing on the multi-family before approving new loans.The BRRRR-style approach could work if you can renovate and refinance quickly, but make sure the timeline aligns with your lender’s requirements.

(This option would would not carry any debt, all debt would be paid in cash)Or keep our current house, rent it out, and cash flow NET monthly about $1,500?

If you find you are unable to raise the money for an all-cash purchase, switching gears to Fannie will only work if you have a LONG time to close in your PSA or have many extension options (which usually require more hard earnest money.)

Fishtown and Point Breeze are strong options but can be pricey.

The cash flow is a bit sub par on this one and I anticipate some larger expenditures coming my way in a year or two so I'm contemplating this as an option.