We live on a property with two houses: the one we live in and a second one that is also a SFR but is classified as an ADU.

The loan will solely be under my partner, who as of this past January recently switched to a job that's classified as variable income (even though the job itself is the same career he's had for the last three years). 

You classified yourself as "completely new" in which case you should not be looking to take on investors.Your focus on 100 units is probably just a number you came up with.

I double checked again with my insurence agent and with these claims being that in are area it was classified and listed as a catastrophic loss for wind storm.

It can be done with comingled funds, it would just cause a lot more bookkeeping and classifying of charges between "business" and personal.

If you have a local news website that offers classifieds, that could be a good resource as well.

I understand every locality is different but I am wondering what the timeframe of your experience was, how easy/difficult it was to get the modular/prefab building approved, whether it was classified as a building or something different since it was modular as well as the square footage of the warehouse you constructed. 

Our lease says "except in accordance with Hawaii law regarding service animals and other classified animals, tenant may not bring pets or have guest bring pets into the unit without prior written consent by the landlord". 

Lenders have what they call "buckets" or "tiers" that classify investors by the number of projects completed last 3 years.I get people started all the time, which is the hardest one to do, the first. 

Residential Properties, Properties with 1-4 units are often classified as Residential.