Availability Rate
The percentage of all space being marketed for sale or lease at a period of time in a given area.

Vacancy Rate
The percentage of all unoccupied space being marketed for sale or lease at a period of time in a given area.

Gross Lease (GRS)
A lease agreement in which the stated rent being paid to the landlord includes property taxes and property insurance.

Gross Absorption
Total number of properties leased or sold for occupancy at a period of time in a given area.

Triple Net Lease (NNN)
A lease agreement whereby the tenant is obligated to pay for all the operating expenses, i.e. property taxes, property insurance, and facility maintenance.