Also, excellent suggestion by @Michael Plante.

Rehab on this house included, patching the roof, replacing and tiling the bathroom, sanding, staining and sealing hardwood floors, reframing and drywalling a cutout arch between kitchen and dinning room, fixing some electrical, painting, Rescreening a porch, building a fence, planted walls and ceiling and installing a new kitchen, installing French drain, added insulation and probably more that I can’t even remember.

Commercial and industrial can cover bowling alleys, Tack sheds, cement plant, restaurant, boat marina, etc.  

Moving the rear door over would have helped tremendously but it's not an option with the budget as the exterior has a very dated stucco style and we wouldn't be able to match color/texture and keep it in budget.So I'm looking for ways to define the open space directly opposite the kitchen.

There is a good community near the new chip plant ( world's largest chip plant called TSMC) called Cooper Leaf. $600's. 

Says his tenants in blue collar neighborhoods tend to pay on time, family-oriented so they plant roots, and they take pride in their home so they keep it clean and do a lot of their own maintenance instead of bothering him. 

If we had that new plant, I probably wouldn't be posting on here. 

It was painted in their burnt red color and they cleaned up the property, added plants, etc.As for the numbers, I believe the seller took care of all of the repairs noted on the home inspection before it was sold. 

@Michael Plante thanks for sharing that!

If they break it, evict.And with ozone generators make sure everyone is out of the building humans/plants/pets if these units are somehow connected or share vents (you mentioned furnace filtering - so I don't know I'd these units are connected or not).