A 3D tour is a virtual property tour that uses 3D imaging to let prospects explore an apartment, floor plan, amenity, or common area online. In multifamily leasing, it gives renters an interactive way to understand a space without being physically present. It may be shared as a tour link through leasing communications or property marketing channels.

5+ rental units means a residential rental property, building, or market segment with five or more individual dwelling units. This threshold is commonly used to define multifamily real estate and distinguish it from smaller rental properties. In operations, it usually means managing leasing, payments, maintenance, reporting, and resident communication across many units at once.

A2L refrigerants are an ASHRAE safety class of HVAC refrigerants with low toxicity and lower flammability. They are being phased into newer air-conditioning and heat-pump equipment as lower-global-warming-potential replacements for older refrigerants such as R-410A. Because they are mildly flammable, they require compatible equipment and updated handling procedures.

Absorption is the change in occupied multifamily units over a set period, often used to show how quickly available units are being leased. In new multifamily supply, a unit is considered absorbed once it has been initially rented or sold and is no longer available. Positive absorption indicates occupied units are increasing; negative absorption indicates occupied units are declining.

Absorption rate is the pace at which available or newly completed apartment units are leased over a set period, such as a month or quarter. It is often expressed as a percentage of available units leased or as units leased per month. In multifamily operations, it helps teams understand whether renter demand is keeping up with available supply.

Access control is the set of rules, workflows, and technology that determines who can enter specific spaces, when they can enter, and how access is granted or removed. In multifamily properties, it can cover buildings, units, amenities, package rooms, garages, gates, elevators, staff areas, and vendor access. It often uses electronic locks, codes, fobs, cards, mobile credentials, visitor passes, and audit logs instead of relying only on physical keys.

Accessory Dwelling Units (ADUs) are secondary homes on the same parcel as a primary residence or multifamily property. They have their own living, sleeping, eating, cooking, and sanitation facilities, and may be detached, attached, or created by converting existing space. Local rules often determine where ADUs are allowed and what limits apply, such as parking, setbacks, unit size, and review standards.

Accounts Payable (AP) is the money a property management company owes to vendors, suppliers, and contractors for goods and services already received. In multifamily operations, AP also refers to the process or team that receives invoices, codes expenses, routes approvals, pays vendors, and records those payments. Common AP expenses include maintenance work, utilities, landscaping, insurance, taxes, and supplies.

Accounts receivable (AR) is money owed to a property that has been earned or charged but not yet collected, such as unpaid rent, fees, reimbursements, or move-out balances. In multifamily operations, AR is tracked as an asset, but it is not usable cash until payment is received. Teams manage AR by reviewing ledgers, verifying payments and credits, resolving disputes, and following consistent collection steps.

An acquisition is the process of purchasing a property or property-related business. In multifamily, it can also refer to the team responsible for finding, evaluating, and closing those purchases. After closing, operations teams often support the transition by setting up systems, validating data, staffing the property, and moving the asset into steady-state operations.