@Christopher Thomas you are installing safety measures externally for multiunit properties including lighting and external cameras.

For my winter projects, I add 10% to my timeline to external work and schedule in throughout the entire project instead of sequencing it toward one end.

I am inclined to keep the tenants in place during the external rehab. 

Structural repairs from sinking floors to bowing external walls.

Spent about $50k in upgrades mainly external capital expenditures (yard, privacy fence, dirt work, drainage, rain gutters, etc.), rented property on upper-end of projections, and am cash flowing off rental income on 2/3 units while living rent-free in the third .

Thank you Katy, if you can provide me with any information regarding NRIA that comes from an external source, that would be great.

Room 1 has a external door that leads to back yard/can be locked from outside.

I've seen a few larger single family houses that have a door blocking the staircase up, then they added an external staircase to the house turning it into an upstairs/downstairs duplex.

So many external tankless water heaters busted all over the city!

So you could build an external garage, and then after the fact choose to setup an office in there.