Final answer:
The ratio between the number of vacant units and the total number of units in a multi-tenant building or development is the occupancy rate, and it is a key metric used to measure how much of a property is filled with tenants.
Step-by-step explanation:
The ratio between the number of vacant units and the total number of units in a multi-tenant building or development is known as the occupancy rate. This metric is important for property owners and investors as it provides information on how much of the property is generating revenue versus how much is unutilized. An occupancy rate is usually expressed as a percentage, with a higher percentage indicating that more units are occupied and generating revenue. It is calculated by subtracting the number of vacant units from the total number of units, dividing the result by the total number of units, and then multiplying by 100 to get a percentage.