For AI agents: a documentation index is available at the root level at /llms.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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DocumentationAPI Reference
DocumentationAPI Reference
  • Start here
    • Welcome to HelloData API
    • Authentication
    • Pricing
    • Changelog
  • Concepts
    • Rate Limits
    • Respecting Rate Limits
    • Common Error Codes
    • Common Calculations
    • Ingestion Timeline
    • Deprecations
  • Examples
    • Property Search
    • Property Details & History
    • Identify Comparables
    • Price Recommendations
    • Property ID Changes
    • Dataset Export
  • Support
    • Contact Us
  • Welcome to HelloData API
  • Authentication
  • Pricing
  • Changelog
  • February 19, 2026
  • February 18, 2026
  • January 28, 2026
  • January 14, 2026
  • January 8, 2026
  • December 1, 2025
  • November 11, 2025
  • October 24, 2025
  • October 17, 2025
  • September 19, 2025
  • August 22, 2025
  • July 28, 2025
  • June 24, 2025
  • June 5, 2025
  • June 2, 2025
  • May 15, 2025
  • April 29, 2025
  • April 10, 2025
  • March 30, 2025
  • March 21, 2025
  • February 14, 2025
  • February 5, 2025
  • February 3, 2025
  • December 11, 2024
  • November 18, 2024
  • October 30, 2024
  • October 8, 2024
  • September 15, 2024
  • September 5, 2024
  • August 22, 2024
  • August 13, 2024
  • August 9, 2024
  • August 6, 2024
  • June 14, 2024
  • May 24, 2024
  • May 21, 2024
  • May 20, 2024
  • May 14, 2024
  • May 9, 2024
  • April 22, 2024
  • April 8, 2024
  • April 1, 2024
  • March 27, 2024
  • March 21, 2024
  • March 19, 2024
  • March 15, 2024
  • March 2, 2024
  • February 21, 2024
  • February 17, 2024
  • February 14, 2024
  • Rate Limits
  • Respecting Rate Limits
  • Common Error Codes
  • Common Calculations
  • Ingestion Timeline
  • Deprecations
  • Property Search
  • Property Details & History
  • Identify Comparables
  • Price Recommendations
  • Property ID Changes
  • Dataset Export
  • Contact Us
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Start here

Changelog

Feb 19, 2026

New Feature

Query Builder: Rent Roll Columns Added a new Rent Roll column category for Query Builder. New columns: rent_roll_floorplan_name rent_roll_bed rent_roll_bath rent_roll_partial_bath…

Improvement

Query Validation: Rent Roll Compatibility Guardrails Query Builder now rejects incompatible mixed selections with HTTP 422 across dataset validation endpoints. Incompatible mix: Any Rent Roll column…

Improvement

Query Builder: Rent Roll Aggregation Selectors Added 3 mutually exclusive Rent Roll aggregation selector columns: rent_roll_aggregation_bed_bath rent_roll_aggregation_bed_bath_sqft…

Feb 18, 2026

Improvements

Property New query parameter use_tmlp can be passed in to adjust property prices to use the Total Monthly Leasing Price Rent value.

Jan 28, 2026

Improvement

Relative Date Filters in Query Builder Date filters in the Query Builder now support relative time ranges (in addition to selecting specific calendar dates). This is especially useful for scheduled…

Jan 14, 2026

New Feature

Date Filtering for Property Details We've added optional date filtering to the GET /property/{id} endpoint, allowing you to filter units, history, availability periods, and concessions based on a…

Jan 8, 2026

New Feature

Effective Rent Filtering in Unit Mix We've added support for filtering by effective rent (after concessions) in addition to asking rent. You can now filter properties by effective rent and effective…

Dec 1, 2025

Improvement

Rate Limiter: Updated headers We've updated our rate limit headers from IETF draft v7 to the latest v10 format. The headers now use structured header syntax with quoted policy names for better…

Nov 11, 2025

New Feature

Comparables: Student Assets & Distance to Universities We added support to POST /property/comparables for more student housing scenarios. Use isStudent=true to indicate the subject is student housing…

Oct 24, 2025

New Feature

Property Search: created_on We added a new field created_on to the GET /property/search endpoint so you know when the data was last updated. This field will be populated 2025-10-25.

Oct 17, 2025

New Feature

Market: Shape Search endpoint We added a GET /market/shape_search endpoint to search for markets by name, city, state, or tags. Provide the q query string to receive up to 7 matches, including market…

Sep 19, 2025

New Feature

Property To support greater fee transparency and help clients make fair comparisons, our system will now always display the base rent. In addition, we’ve introduced a new building-level attribute,…

Aug 22, 2025

New Feature

School Term We've supported student housing data for several years, and now we're making it even easier to use by introducing school term as a dedicated field. This addition makes it simpler to…

Jul 28, 2025

Deprecation: Quality Score

The /qualityscore/* computer vision endpoints are now deprecated. These models have been outdated for some time, and usage has been minimal. We're focusing our efforts on more impactful and widely…

Jun 24, 2025

New Feature

Async Dataset Export with Webhook Notifications Introduced /dataset/export endpoint for asynchronous dataset exports with webhook delivery Perfect for large datasets that would timeout with…

Jun 5, 2025

Improvement

Added id_alias to search Use the property id in the query of /property/search?q=. See all alias ids that map to the primary id to help dedupe when primary IDs change

Jun 2, 2025

Improvement

Enhanced Regional Report Filters Added comprehensive unit mix filtering capabilities to regional reports Filter by unit count, square footage, rent, and rent per square foot for: Overall property…

May 15, 2025

Improvement

Visual banner concession detection We've enhanced our system to detect concessions that are advertised in images and visual banners No data schema changes required - newly detected concessions will…

Apr 29, 2025

Improvement

Lesser Quality The renovations field on the comparables endpoint now accepts negative values, to let you look for properties with lesser quality. The full range of the slider is now -1.0 to 1.0. For…

Apr 10, 2025

New Feature

Google Reviews The review_analysis field on the PropertyDetailsResponse object is now factoring in Google Reviews.

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