I would look at the DSCR loan as the first option.By the way, I suspect you are going to be disappointed by any refi appraisals   ADUs typically appraise poorly   JADUs can lower the property value Vs having the space as part of the primary unit.  

from a laptop or mobile phone on one of my SFR's (internet must be hooked up, but most tenants do it anyway and like to be able to monitor the outside of the house remotely, even if there's nothing going on.)

Would it be frowned upon to use a seperate personal account strictly for the business until I get back to the states in about 6 months to phyiscally go and open a business checking account.

I am currently house hacking with an upper/lower setup - I occupy the upper. The lower unit is a basement/guest suite. As I approach my move out strategy where I will be converting my upper unit into a STR, I often th...

It's easy to obtain, costs very little, and doesn't require extra, on-going effort to maintain. 

in a stick frame market and one of the cheapest markets to build we build with margin at $190 or so a square foot. that will go up over time about 5% or 10% a year to keep up with new build price increases. we are buidling a 3 story walk up and source some of the lowest priced crews.

Any semi-intelligent agent is going to do the math and want to cover their expenses.

I would suggest you hire an inspector as well as have a general contractor go out to the property.

We are budget conscious and don't want to spend much on the interior by going with a general contractors(that will be the last option).

It’s great to hear that you and your wife are going into this!