What is the definition of physical vacancy?

Physical vacancy (A) is defined as the percentage of units that are unoccupied and available for lease.

Facility managers track vacancy rates to measure space utilization and rental potential.

Why not other options?

(B) Spaces occupied but in delinquencies relate to financial issues, not physical vacancy.

(C) Occupied but non-revenue-producing spaces refer to economic vacancy.

(D) Leasable but unusable space is classified as "non-leasable inventory."

Reference: IFMA Core Competency – Real Estate & Lease Management​