Improvements - In the context of leasing, the term typically refers to the improvements made to or inside a building but may include any permanent structure or other development, such as a street, sidewalks, utilities, etc. See also “Leasehold Improvements”. See also “Leasehold Improvements” and "Tenant Improvements".

Indirect Costs - Development costs, other than material and labor costs which are directly related to the construction of improvements, including administrative and office expenses, commissions, architectural, engineering and financing costs.

Internal Rate of Return (IRR) - The true annual rate of earnings on an investment. Equates the value of cash invested with cash returns. Considers the application of compound interest factors.

Inventory - The total amount of rentable square feet of existing and any forthcoming space (whether it be a tenant vacating space or new buildings coming on the market), in a given category, for example, all warehouse space in a specified submarket. Inventory refers to all space within a certain proscribed market without regard to its availability or condition, and categories can include all types of leased space such as office, flex, retail and warehouse space.

Investment Bank - A lending institution that is both a direct lender as well as an intermediary.

ISAOA - Acronym for It's Successors And Other Assigns. Refers to related parties providing products and services for the principal company.