The best way to answer this question is to look at the square feet of the home and how many can comfortably fit in the common areas...i.e. dining room, living room, outdoor spaces, etc.

Anywhere from 1000-1400 square feet.  

I’ll be working out of state with these folks so it’s important to me that they are good, dependable people with connections to be my hands, feet, eyes on the ground.

Get your feet wet and then decide if you want to move into other projects or if you want to stick with the easier properties.  

All-in-all, it spans ~15 feet right to left. - Above the sliding door / balcony of this unit is another balcony for the unit above.

Someone who is willing to mentor and help me get on my feet, so I can fly solo.

Congrats on getting your feet wet.

It's great that you are getting your feet wet and want to start in REI.

There is no standard way to measure sq feet.

If you discover foundation or structural issues these can also be expensive.I would not use a per square foot figure like, $50.00 or $75.00 per square multiplied by the number of sq. feet.