> ## Documentation Index
> Fetch the complete documentation index at: https://developers.apartmentiq.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Key Terms

> Definitions used throughout the ApartmentIQ API.

* **Competitive Set (Comp Set)**: The list of properties you monitor and compare in a market survey.
* **Market Survey**: A table of property-level metrics and aggregates for a competitive set.
* **Subject Property**: The primary property in a comp set you’re benchmarking against.
* **Unit**: An individual apartment unit with attributes such as bedroom/bathroom counts, rent, square footage, availability, and concessions.
* **Floorplan**: A group of units with the same layout. Often summarized with metrics like asking rent, net effective rent, rent per square foot, size, and unit counts.
* **Concessions**: Discounts or promotions offered to renters (for example, weeks free or reduced fees). Concessions may have restrictions and expiration dates.
* **Net Effective Rent (NER)**: Rent after accounting for concessions. May also be expressed per square foot.
* **Rent per Square Foot (Rent PSF)**: Asking rent divided by square footage.
* **Days on Market (DOM)**: Number of days since a unit or floorplan began being advertised.
* **Exposure**: Percentage of units currently available for lease.
* **Advertised Occupancy**: Occupancy percentage based on publicly advertised availability.
* **Leased Percent**: Percentage of units currently leased.
* **Pre‑Leased Percent**: Percentage of units committed for a future move‑in.
* **Available Units Count**: Number of units currently available (vacant and occupied but available).
* **Vacant Units Count**: Number of units currently vacant.
* **Aggregation Type**: The method used to roll up floorplan or unit metrics (for example, average) across records.
* **Unit Style**: A unit category such as affordable, standard, penthouse, or renovated.
* **Geo Boundary**: A defined geographic area used to filter or group properties.
* **Geo Boundary ID**: The numeric identifier of a geo boundary returned by search.
* **Geo Type**: The category of a geo boundary. Common values include MSA, Submarket, Census Place (city/town), Zip Code, County, and Neighborhood.
* **Centroid**: The latitude/longitude of the center point of a geo boundary.
* **GeoJSON**: A standard format for describing geographic geometries (used to pass polygons for spatial filters).
* **Account ID**: The identifier of the ApartmentIQ account that scopes your data access.
* **Property ID**: The unique identifier of a property in ApartmentIQ.
* **Unit Mix**: Estimated count or share of each floorplan type within a property.
* **Unit Mix Percent**: The percentage of a property’s units that belong to a given floorplan type.
* **Comp Score**: A property’s overall match score within a comp set.