Do I count my "Doors"?

[Julia Hagen]

I have three homes, some of which I've subdivided into individual units, one of which has an attached granny, one a remodeled garage studio, and another in which I just remodeled the master suite add-on into a large studio. I've heard investors use the term "doors" when referring to their portfolios. Like how many "doors" they have in total vs how many individual units. What is the best way for me to describe what I have? (Three homes with 10 individual units between them)

Thanks!!